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Orb-weaver spiders
Temporal range: Cretaceous–present
female Araneus diadematus
Argiope catenulata
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Superfamily: Araneoidea
Family: Araneidae
Clerck, 1757
Diversity
198 genera, 3,000+ species
blue: reported countries (WSC)
green: observation hotspots (iNaturalist)

Orb-weaver spiders are members of the spider family Araneidae. They are the most common group of builders of spiral wheel-shaped webs often found in gardens, fields, and forests. The English word "orb" can mean "circular",[1] hence the English name of the group. Araneids have eight similar eyes, hairy or spiny legs, and no stridulating organs.

The family has a cosmopolitan distribution, including many well-known large or brightly colored garden spiders. With more than 3,000 species in about 200 genera worldwide, the Araneidae comprise one of the largest family of spiders (with the Salticidae and Linyphiidae).[2] Araneid webs are constructed in a stereotypical fashion, where a framework of nonsticky silk is built up before the spider adds a final spiral of silk covered in sticky droplets.

Orb webs are also produced by members of other spider families. The long-jawed orb weavers (Tetragnathidae) were formerly included in the Araneidae; they are closely related, being part of the superfamily Araneoidea. The family Arkyidae has been split off from the Araneidae.[3][4][2] The cribellate or hackled orb-weavers (Uloboridae) belong to a different group of spiders. Their webs are strikingly similar, but use a different kind of silk.

Description

[edit]
Spiderlings in the web near where they hatched
Araneidae web

Generally, orb-weaving spiders are three-clawed builders of flat webs with sticky spiral capture silk. The building of a web is an engineering feat, begun when the spider floats a line on the wind to another surface. The spider secures the line and then drops another line from the center, making a "Y". The rest of the scaffolding follows with many radii of nonsticky silk being constructed before a final spiral of sticky capture silk.

The third claw is used to walk on the nonsticky part of the web. Characteristically, the prey insect that blunders into the sticky lines is stunned by a quick bite, and then wrapped in silk. If the prey is a venomous insect, such as a wasp, wrapping may precede biting and/or stinging. Much of the orb-spinning spiders' success in capturing insects depends on the web not being visible to the prey, with the stickiness of the web increasing the visibility, thus decreasing the chances of capturing prey. This leads to a trade-off between the visibility of the web and the web's prey-retention ability.[5]

Many orb-weavers build a new web each day. Most orb-weavers tend to be active during the evening hours; they hide for most of the day. Generally, towards evening, the spider consumes the old web, rests for about an hour, then spins a new web in the same general location. Thus, the webs of orb-weavers are generally free of the accumulation of detritus common to other species, such as black widow spiders.

Some orb-weavers do not build webs at all. Members of the genera Mastophora in the Americas, Cladomelea in Africa, and Ordgarius in Australia produce sticky globules, which contain a pheromone analog. The globule is hung from a silken thread dangled by the spider from its front legs. The pheromone analog attracts male moths of only a few species. These get stuck on the globule and are reeled in to be eaten. Both genera of bolas spiders are highly camouflaged and difficult to locate.

In the Araneus diadematus, variables such as wind, web support, temperatures, humidity, and silk supply all proved to be variables in web construction. When studied against the tests of nature, the spiders were able to decide what shape to make their web, how many capture spirals, or the width of their web.[6] Though it could be expected for these spiders to just know these things, it is not well researched yet as to just how the arachnid knows how to change their web design based on their surroundings. Some scientists suggest that it could be through the spider's spatial learning on their environmental surroundings and the knowing of what will or will not work compared to natural behavioristic rules.[7]

The spiny orb-weaving spiders in the genera Gasteracantha and Micrathena look like plant seeds or thorns hanging in their orb-webs. Some species of Gasteracantha have very long, horn-like spines protruding from their abdomens.

One feature of the webs of some orb-weavers is the stabilimentum, a crisscross band of silk through the center of the web. It is found in several genera, but Argiope – the yellow and banded garden spiders of North America – is a prime example. As orb-weavers age, they tend to have less production of their silk; many adult orb-weavers can then depend on their coloration to attract more of their prey.[8] The band may be a lure for prey, a marker to warn birds away from the web, and a camouflage for the spider when it sits in the web. The stabilimentum may decrease the visibility of the silk to insects, thus making it harder for prey to avoid the web.[9] In the genus Cyclosa, some species have been documented to construct stabilimenta made of silk and detritus that are shaped to visually resemble a larger, more threatening spider, an anti-predator strategy known as decoy mimicry.[10] The orb-web consists of a frame and supporting radii overlaid with a sticky capture spiral, and the silks used by orb-weaver spiders have exceptional mechanical properties to withstand the impact of flying prey.[11] The orb-weaving spider Zygiella x-notata produces a unique orb-web with a characteristic missing sector, similar to other species of the Zygiella genus in the Araneidae family.[12]

During the Cretaceous, a radiation of flowering plants and their insect pollinators occurred. Fossil evidence shows that the orb web was in existence at this time, which permitted a concurrent radiation of the spider predators along with their insect prey.[13][14] The capacity of orb–webs to absorb the impact of flying prey led orbicularian spiders to become the dominant predators of aerial insects in many ecosystems.[15] Insects and spiders have comparable rates of diversification, suggesting they co-radiated, and the peak of this radiation occurred 100 Mya, before the origin of angiosperms.[16] Vollrath and Selden (2007) make the bold proposition that insect evolution was driven less by flowering plants than by spider predation – particularly through orb webs – as a major selective force.[16] On the other hand some analyses have yielded estimates as high as 265 Mya, with a large number (including Dimitrov et al 2016) intermediate between the two.[4]

Most arachnid webs are vertical and the spiders usually hang with their heads downward. A few webs, such as those of orb-weavers in the genus Metepeira, have the orb hidden within a tangled space of web. Some Metepiera species are semisocial and live in communal webs. In Mexico, such communal webs have been cut out of trees or bushes and used for living fly paper.[citation needed] In 2009, workers at a Baltimore wastewater treatment plant called for help to deal with over 100 million orb-weaver spiders, living in a community that managed to spin a phenomenal web that covered some 4 acres of a building, with spider densities in some areas reaching 35,176 spiders per cubic meter.[17]

Taxonomy

[edit]
Argiope lobata in southern Spain

The oldest known true orb-weaver is Mesozygiella dunlopi, from the Lower Cretaceous. Several fossils provide direct evidence that the three major orb-weaving families, namely the Araneidae, Tetragnathidae, and Uloboridae, had evolved by this time, about 140 Mya.[18] They probably originated during the Jurassic (200 to 140 million years ago). Based on new molecular evidence in silk genes, all three families are likely to have a common origin.[11][14][15]

The two superfamilies, Deinopoidea and Araneoidea, have similar behavioral sequences and spinning apparatuses to produce architecturally similar webs. The latter weave true viscid silk with an aqueous glue property, and the former use dry fibrils and sticky silk.[11][19] The Deinopoidea (including the Uloboridae), have a cribellum – a flat, complex spinning plate from which the cribellate silk is released.[20]

They also have a calamistrum – an apparatus of bristles used to comb the cribellate silk from the cribellum. The Araneoidea, or the "ecribellate" spiders, do not have these two structures. The two groups of orb-weaving spiders are morphologically very distinct, yet much similarity exists between their web forms and web construction behaviors. The cribellates retained the ancestral character, yet the cribellum was lost in the escribellates. The lack of a functional cribellum in araneoids is most likely synapomorphic.[20]

If the orb-weaver spiders are a monophyletic group, the fact that only some species in the group lost a feature adds to the controversy. The cribellates are split off as a separate taxon that retained the primitive feature, which makes the lineage paraphyletic and not synonymous with any real evolutionary lineage. The morphological and behavioral evidence surrounding orb webs led to the disagreement over a single or a dual origin.[20] While early molecular analysis provided more support for a monophyletic origin,[11][14][15] other evidence indicates that orb-weavers evolved earlier phylogenetically than previously thought, and were extinct at least three times during the Cretaceous.[21][22][4]

Reproduction

[edit]

Araneid species either mate at the central hub of the web, where the male slowly traverses the web, trying not to get eaten, and when reaching the hub, mounts the female; or the male constructs a mating thread inside or outside the web to attract the female via vibratory courtship, and if successful, mating occurs on the thread.[23]

In the cannibalistic and polyandrous orb-web spider Argiope bruennichi, the much smaller males are attacked during their first copulation and are cannibalized in up to 80% of the cases.[24] All surviving males die after their second copulation, a pattern observed in other Argiope species. Whether a male survives his first copulation depends on the duration of the genital contact; males that jump off early (before 5 seconds) have a chance of surviving, while males that copulate longer (greater than 10 seconds) invariably die. Prolonged copulation, although associated with cannibalism, enhances sperm transfer and relative paternity.[24]

When males mated with a nonsibling female, the duration of their copulation was prolonged, and consequently the males were cannibalized more frequently.[25] When males mated with a sibling female, they copulated briefly, thus were more likely to escape cannibalism. By escaping, their chance of mating again with an unrelated female likely would be increased. These observations suggest that males can adaptively adjust their investment based on the degree of genetic relatedness of the female to avoid inbreeding depression.

Sexual size dimorphism

[edit]

Sexual dimorphism refers to physical differences between males and females of the same species. One such difference can be in size.

Araneids often exhibit size dimorphism typically known as extreme sexual size dimorphism, due to the extent of differences in size. The size difference among species of Araneidae ranges greatly. Some females, such as those of the Nephila pilipes, can be at least 9 times larger than the male, while others are only slightly larger than the male.[26] The larger size female is typically thought to be selected through fecundity selection,[27] the idea that bigger females can produce more eggs, thus more offspring. Although a great deal of evidence points towards the greatest selection pressure on larger female size, some evidence indicates that selection can favor small male size, as well.

Araneids also exhibit a phenomenon called sexual cannibalism, which is commonly found throughout the Araneidae.[23] Evidence suggests a negative correlation between sexual size dimorphism and instances of sexual cannibalism.[27] Other evidence, however, has shown that differences in cannibalistic events among araneids when having smaller or slightly larger males is advantageous.[23]

Some evidence has shown that extreme dimorphism may be the result of males avoiding detection by the females. For males of these species, being smaller in size may be advantageous in moving to the central hub of a web so female spiders may be less likely to detect the male, or even if detected as prey to be eaten, the small size may indicate little nutritional value. Larger-bodied male araneids may be advantageous when mating on a mating thread because the thread is constructed from the edge of the web orb to structural threads or to nearby vegetation.[23] Here larger males may be less likely to be cannibalized, as the males are able to copulate while the female is hanging, which may make them safer from cannibalism.[23] In one subfamily of Araneid that uses a mating thread, Gasteracanthinae, sexual cannibalism is apparently absent despite extreme size dimorphism.[28]

Genera

[edit]
Argiope sp. sitting on the stabilimentum at the center of the web
Close-up of the cephalothorax on Eriophora sp. (possibly E. heroine or E. pustuosa)
Gasteracantha cancriformis

As of September 2025, this family includes 198 genera:[29]

  • Abba Castanheira & Framenau, 2023 – Australia (Queensland, New South Wales)
  • Acacesia Simon, 1895 — South America, North America
  • Acantharachne Tullgren, 1910 — Congo, Madagascar, Cameroon
  • Acanthepeira Marx, 1883 — North America, Brazil, Cuba
  • Acroaspis Karsch, 1878 — New Zealand, Australia
  • Acrosomoides Simon, 1887 — Madagascar, Cameroon, Congo
  • Actinacantha Simon, 1864 — Indonesia
  • Actinosoma Holmberg, 1883 — Colombia, Argentina
  • Aculepeira Chamberlin & Ivie, 1942 — North America, Central America, South America, Asia, Europe
  • Acusilas Simon, 1895 — Asia
  • Aethriscus Pocock, 1902 — Congo
  • Aethrodiscus Strand, 1913 — Central Africa
  • Aetrocantha Karsch, 1879 — Central Africa
  • Afracantha Dahl, 1914 — Africa
  • Agalenatea Archer, 1951 — Ethiopia, Asia
  • Alenatea Song & Zhu, 1999 — Asia
  • Allocyclosa Levi, 1999 — United States, Panama, Cuba
  • Alpaida O. Pickard-Cambridge, 1889 — Central America, South America, Mexico, Caribbean
  • Amazonepeira Levi, 1989 — South America
  • Anepsion Strand, 1929 — Oceania, Asia
  • Aoaraneus Tanikawa, Yamasaki & Petcharad, 2021 — China, Japan, Korea, Taiwan
  • Arachnura Clerck, 1863
  • Araneus Clerck, 1757
  • Araniella Chamberlin & Ivie, 1942 — Palearctic
  • Aranoethra Butler, 1873 — Africa
  • Argiope Audouin, 1826 — Asia, Oceania, Africa, North America, South America, Costa Rica, Cuba, Portugal
  • Artiphex Kallal & Hormiga, 2022 – Australia, New Caledonia
  • Artonis Simon, 1895 — Myanmar, Ethiopia
  • Aspidolasius Simon, 1887 — South America
  • Augusta O. Pickard-Cambridge, 1877 — Madagascar
  • Austracantha Dahl, 1914 — Australia
  • Backobourkia Framenau, Dupérré, Blackledge & Vink, 2010 — Australia, New Zealand
  • Bertrana Keyserling, 1884 — South America, Central America
  • Bijoaraneus Tanikawa, Yamasaki & Petcharad, 2021 — Africa, Asia, Oceania
  • Caerostris Thorell, 1868 — Africa, Asia
  • Carepalxis L. Koch, 1872 — Oceania, South America, Mexico, Jamaica
  • Celaenia Thorell, 1868 — Australia, New Zealand
  • Cercidia Thorell, 1869 — Russia, Kazakhstan, India
  • Chorizopes O. Pickard-Cambridge, 1871 — Asia, Madagascar
  • Chorizopesoides Mi & Wang, 2018 — China, Vietnam
  • Cladomelea Simon, 1895 — South Africa, Congo
  • Clitaetra Simon, 1889 — Africa, Sri Lanka
  • Cnodalia Thorell, 1890 — Indonesia, Japan
  • Coelossia Simon, 1895 — Sierra Leone, Mauritius, Madagascar
  • Colaranea Court & Forster, 1988 — New Zealand
  • Colphepeira Archer, 1941 — United States, Mexico
  • Courtaraneus Framenau, Vink, McQuillan & Simpson, 2022 — New Zealand
  • Cryptaranea Court & Forster, 1988 — New Zealand
  • Cyclosa Menge, 1866 — Caribbean, Asia, Oceania, South America, North America, Central America, Africa, Europe
  • Cyphalonotus Simon, 1895 — Asia, Africa
  • Cyrtarachne Thorell, 1868 — Asia, Africa, Oceania
  • Cyrtobill Framenau & Scharff, 2009 — Australia
  • Cyrtophora Simon, 1864 — Asia, Oceania, Dominican Republic, Costa Rica, South America, Africa
  • Deione Thorell, 1898 — Myanmar
  • Deliochus Simon, 1894 — Australia, Papua New Guinea
  • Dolophones Walckenaer, 1837 — Australia, Indonesia
  • Dubiepeira Levi, 1991 — South America
  • Edricus O. Pickard-Cambridge, 1890 — Mexico, Panama, Ecuador
  • Enacrosoma Mello-Leitão, 1932 — South America, Central America, Mexico
  • Encyosaccus Simon, 1895 — South America
  • Epeiroides Keyserling, 1885 — Costa Rica, Brazil
  • Eriophora Simon, 1864 — North America, South America, Central America, Africa, Asia
  • Eriovixia Archer, 1951 — Asia, Papua New Guinea, Africa
  • Eustacesia Caporiacco, 1954 — French Guiana
  • Eustala Simon, 1895 — South America, North America, Central America, Caribbean
  • Exechocentrus Simon, 1889 — Madagascar
  • Faradja Grasshoff, 1970 — Congo
  • Friula O. Pickard-Cambridge, 1897 — Indonesia
  • Galaporella Levi, 2009 — Ecuador
  • Gasteracantha Sundevall, 1833 — Oceania, Asia, United States, Africa, Chile
  • Gastroxya Benoit, 1962 — Africa
  • Gea C. L. Koch, 1843 — Africa, Oceania, Asia, United States, Argentina
  • Gibbaranea Archer, 1951 — Asia, Europe, Algeria
  • Glyptogona Simon, 1884 — Sri Lanka, Italy, Israel
  • Gnolus Simon, 1879 — Chile, Argentina
  • Guizygiella Zhu, Kim & Song, 1997 — Asia
  • Herennia Thorell, 1877 — Asia, Oceania
  • Heterognatha Nicolet, 1849 — Chile
  • Hingstepeira Levi, 1995 — South America
  • Hortophora Framenau & Castanheira, 2021 — Oceania
  • Hypognatha Guérin, 1839 — South America, Central America, Mexico, Trinidad
  • Hypsacantha Dahl, 1914 — Africa
  • Hypsosinga Ausserer, 1871 — Asia, North America, Greenland, Africa
  • Ideocaira Simon, 1903 — South Africa
  • Indoetra Kuntner, 2006 — Sri Lanka
  • Isoxya Simon, 1885 — Africa, Yemen
  • Kaira O. Pickard-Cambridge, 1889 — North America, South America, Cuba, Guatemala
  • Kangaraneus Castanheira & Framenau, 2023 — Australia
  • Kapogea Levi, 1997 — Mexico, South America, Central America
  • Kilima Grasshoff, 1970 — Congo, Seychelles, Yemen
  • Larinia Simon, 1874 — Asia, Africa, South America, Europe, Oceania, North America
  • Lariniaria Grasshoff, 1970 — Asia
  • Larinioides Caporiacco, 1934 — Asia
  • Lariniophora Framenau, 2011 — Australia
  • Leviana Framenau & Kuntner, 2022 — Australia
  • Leviaraneus Tanikawa & Petcharad, 2023 — Asia
  • Leviellus Wunderlich, 2004 — Asia, France
  • Lewisepeira Levi, 1993 — Panama, Mexico, Jamaica
  • Lipocrea Thorell, 1878 — Asia, Europe
  • Macracantha Simon, 1864 — India, China, Indonesia
  • Madacantha Emerit, 1970 — Madagascar
  • Mahembea Grasshoff, 1970 — Central and East Africa
  • Mangora O. Pickard-Cambridge, 1889 — Asia, North America, South America, Central America, Caribbean
  • Mangrovia Framenau & Castanheira, 2022 — Australia
  • Manogea Levi, 1997 — South America, Central America, Mexico
  • Mastophora Holmberg, 1876 — South America, North America, Central America, Cuba
  • Mecynogea Simon, 1903 — North America, South America, Cuba
  • Megaraneus Lawrence, 1968 — Africa
  • Melychiopharis Simon, 1895 — Brazil
  • Metazygia F. O. Pickard-Cambridge, 1904 — South America, Central America, North America, Caribbean
  • Metepeira F. O. Pickard-Cambridge, 1903 — North America, Caribbean, South America, Central America
  • Micrathena Sundevall, 1833 — South America, Caribbean, Central America, North America
  • Micrepeira Schenkel, 1953 — South America, Costa Rica
  • Micropoltys Kulczyński, 1911 — Papua New Guinea, Australia
  • Milonia Thorell, 1890 — Singapore, Indonesia, Myanmar
  • Molinaranea Mello-Leitão, 1940 — Chile, Argentina
  • Nemoscolus Simon, 1895 — Africa
  • Nemosinga Caporiacco, 1947 — Tanzania
  • Nemospiza Simon, 1903 — South Africa
  • Neogea Levi, 1983 — Papua New Guinea, India, Indonesia
  • Neoscona Simon, 1864 — Asia, Africa, Europe, Oceania, North America, Cuba, South America
  • Nephila Leach, 1815 — Asia, Oceania, United States, Africa, South America
  • Nephilengys L. Koch, 1872 — Asia, Oceania
  • Nephilingis Kuntner, 2013 — South America, Africa
  • Nicolepeira Levi, 2001 — Chile
  • Novakiella Court & Forster, 1993 — Australia, New Zealand
  • Novaranea Court & Forster, 1988 — Australia, New Zealand
  • Nuctenea Simon, 1864 — Algeria, Asia, Europe
  • Oarces Simon, 1879 — Brazil, Chile, Argentina
  • Ocrepeira Marx, 1883 — South America, Central America, Caribbean, North America
  • Ordgarius Keyserling, 1886 — Asia, Oceania
  • Paralarinia Grasshoff, 1970 — Congo, South Africa
  • Paraplectana Brito Capello, 1867 — Asia, Africa
  • Paraplectanoides Keyserling, 1886 — Australia
  • Pararaneus Caporiacco, 1940 — Madagascar
  • Paraverrucosa Mello-Leitão, 1939 — South America
  • Parawixia F. O. Pickard-Cambridge, 1904 — Mexico, South America, Asia, Papua New Guinea, Central America, Trinidad
  • Parazygiella Wunderlich, 2004 – Eurasia, North America
  • Parmatergus Emerit, 1994 — Madagascar
  • Pasilobus Simon, 1895 — Africa, Asia
  • Pengaraneus Mi, Wang & Li, 2024 – China
  • Perilla Thorell, 1895 — Myanmar, Vietnam, Malaysia
  • Pherenice Thorell, 1899 — Cameroon
  • Phonognatha Simon, 1894 — Australia
  • Pitharatus Simon, 1895 — Malaysia, Indonesia
  • Plebs Joseph & Framenau, 2012 — Oceania, Asia
  • Poecilarcys Simon, 1895 — Tunisia
  • Poecilopachys Simon, 1895 — Oceania
  • Poltys C. L. Koch, 1843 — Asia, Africa, Oceania
  • Popperaneus Cabra-García & Hormiga, 2020 — Brazil, Paraguay
  • Porcataraneus Mi & Peng, 2011 — India, China
  • Pozonia Schenkel, 1953 — Caribbean, Paraguay, Mexico, Panama
  • Prasonica Simon, 1895 — Africa, Asia, Oceania
  • Prasonicella Grasshoff, 1971 — Madagascar, Seychelles
  • Pronoides Schenkel, 1936 — Asia
  • Pronous Keyserling, 1881 — Malaysia, Mexico, Central America, South America, Madagascar
  • Pseudartonis Simon, 1903 — Africa
  • Pseudopsyllo Strand, 1916 — Cameroon
  • Psyllo Thorell, 1899 — Cameroon, Congo
  • Pycnacantha Blackwall, 1865 — Africa
  • Quokkaraneus Castanheira & Framenau, 2022 – Australia
  • Rubrepeira Levi, 1992 — Mexico, Brazil
  • Salsa Framenau & Castanheira, 2022 — Australia, New Caledonia, Papua New Guinea
  • Scoloderus Simon, 1887 — Belize, North America, Argentina, Caribbean
  • Sedasta Simon, 1894 — West Africa
  • Singa C. L. Koch, 1836 — Africa, Asia, North America, Europe
  • Singafrotypa Benoit, 1962 — Africa
  • Siwa Grasshoff, 1970 — Asia
  • Socca Framenau, Castanheira & Vink, 2022 — Australia
  • Songaraneus Mi, Wang & Li, 2024 – China, Korea, Japan, Singapore
  • Spilasma Simon, 1897 — South America, Honduras
  • Spinepeira Levi, 1995 — Peru
  • Spintharidius Simon, 1893 — South America, Cuba
  • Taczanowskia Keyserling, 1879 — Mexico, South America
  • Talthybia Thorell, 1898 — China, Myanmar
  • Tangaraneus Mi, Wang & Li, 2024 – China
  • Tatepeira Levi, 1995 — South America, Honduras
  • Telaprocera Harmer & Framenau, 2008 — Australia
  • Testudinaria Taczanowski, 1879 — South America, Panama
  • Thelacantha Hasselt, 1882 — Madagascar, Asia, Australia
  • Thorellina Berg, 1899 — Myanmar, Papua New Guinea
  • Togacantha Dahl, 1914 — Africa
  • Trichonephila Dahl, 1911 — Africa, Asia, Oceania, North America, South America
  • Umbonata Grasshoff, 1971 — Tanzania
  • Ursa Simon, 1895 — Asia, South America, South Africa
  • Venomius Rossi, Castanheira, Baptista & Framenau, 2023 — Australia
  • Verrucosa McCook, 1888 — North America, Panama, South America, Australia
  • Wagneriana F. O. Pickard-Cambridge, 1904 — South America, Central America, Caribbean, North America
  • Wangaraneus Mi, Wang & Li, 2024 – China, Vietnam
  • Witica O. Pickard-Cambridge, 1895 — Cuba, Mexico, Peru
  • Wixia O. Pickard-Cambridge, 1882 — Brazil, Guyana, Bolivia
  • Xylethrus Simon, 1895 — South America, Mexico, Jamaica, Panama
  • Yaginumia Archer, 1960 — Asia
  • Yinaraneus Mi, Wang & Li, 2024 – China
  • Zealaranea Court & Forster, 1988 — New Zealand
  • Zhuaraneus Mi, Wang & Li, 2024 – China, Vietnam
  • Zilla C. L. Koch, 1834 — Azerbaijan, India, China
  • Zygiella F. O. Pickard-Cambridge, 1902 — North America, Asia, Ukraine, South America

See also

[edit]

References

[edit]

Further reading

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Orb-weaver spider

View on Grokipedia
from Grokipedia
Orb-weaver spiders, belonging to the family Araneidae, are a diverse group of arachnids characterized by their construction of distinctive wheel-shaped webs to capture aerial . This family, classified under the order Araneae and suborder , comprises approximately 3,160 species worldwide as of November 2025, making it the third-largest spider family after Salticidae and . These spiders exhibit a wide range of sizes, from less than 0.25 inches to over 1 inch in body length, with females typically larger than males, and feature bulbous abdomens adapted for silk production and , often adorned with colorful patterns or spines in some species. Orb-weavers are distributed globally in various habitats, including gardens, forests, grasslands, and near structures like buildings and outdoor lights where prey is abundant. They construct their orbicular webs—consisting of radial spokes and a sticky spiral—primarily at or dawn, consuming and rebuilding them daily to recycle proteins efficiently. These webs, often vertical and spanning up to several feet, serve as both hunting tools and shelters, with some incorporating a (a band of ) possibly for or reinforcement. Behaviorally, orb-weavers are docile and non-aggressive, fleeing threats rather than biting, and their poses minimal risk to , comparable to a if contact occurs. Ecologically, orb-weavers play a vital role as predators, consuming vast numbers of flying such as flies, moths, and beetles, thereby aiding in natural around homes and agricultural areas. In temperate regions, reproduction involves females laying egg sacs in fall, which overwinter and hatch in spring, with spiderlings dispersing via ballooning on silk threads. Notable species include the yellow garden spider (), recognized for its striking black-and-yellow abdomen, and the cross orbweaver (), an introduced species in featuring a cruciform pattern. Despite occasional nuisance from webs near entryways, these spiders are beneficial and should be preserved rather than removed.

Physical Characteristics

Body Structure and Morphology

Orb-weaver spiders (family Araneidae) exhibit a typical body plan consisting of two main tagmata: the (prosoma) and the (opisthosoma), connected by a narrow pedicel. The houses the , digestive glands, and sensory organs, while the contains the heart, respiratory organs, and reproductive structures. The eyes of orb-weavers are arranged in two nearly parallel rows of four, with the posterior median eyes typically larger than the others, providing enhanced for detecting and movements on their webs. This configuration, where the lateral eyes are adjacent and the medians form a , aids in monitoring prey capture from a distance. The features robust equipped with fangs for injecting into prey and facilitating handling during feeding. These are hinged and powerful, adapted for piercing and subduing . The is characteristically bulbous and spherical in many , serving as the primary site for large silk glands that produce the various types of used in web construction and other activities. Legs in orb-weavers are eight in number and specialized for locomotion and web-related tasks, with the first pair often the longest to position radial framework threads, and the fourth pair used for attaching the sticky spiral. Tarsi bear scopulae—dense pads of adhesive setae—that enhance grip on lines and surfaces during web manipulation. Unlike some families, Araneidae lack stridulating organs, which are file-like structures used for sound production in defense or mating. Body size varies widely across the family, with females averaging 1.5–2.5 cm in length and exhibiting pronounced , where males are notably smaller; for instance, in species like Trichonephila (formerly ), females can reach up to 4 cm. Males possess elongated pedipalps adapted for sperm transfer.

Coloration and Variation

Orb-weaver spiders (family Araneidae) display a wide array of coloration and morphological variations that serve ecological functions such as defense and foraging. In genera like Argiope, females often exhibit striking yellow, black, and white banded patterns on their abdomens, which function as aposematic warning signals to deter predators by advertising potential unpalatability or the presence of . These bold patterns contrast sharply against foliage, enhancing visibility to birds and other visually hunting predators, thereby reducing attack rates through learned avoidance. In contrast, species of Gasteracantha, known as spiny orb-weavers, feature tuberculate or spiny abdominal projections alongside vibrant color polymorphisms, including yellow-and-black or white-and-black stripes, which provide physical defense against predators like birds and wasps by impaling or deterring attacks. Some tropical orb-weavers, such as certain Cyclosa species, exhibit leaf-like camouflage through mottled brown and green patterns that mimic foliage, allowing them to blend into their surroundings and evade detection. These spiny structures and color variations in Gasteracantha are regionally polymorphic, with spine number and hue maintained by ecological selection for crypsis or apostatic predation avoidance. Web stabilimenta, the silk decorations in orb-webs, often correlate with spider coloration by incorporating UV-reflective that increases overall visibility, potentially attracting UV-sensitive prey like bees and flies while complementing the spider's own conspicuous patterns. For instance, in Argiope species, the bright abdominal colors align with UV-contrasting stabilimenta to create a unified sensory lure, though this may heighten predator risk. Intraspecific variation is common, with juveniles typically displaying more cryptic coloration than adults to minimize predation during vulnerable early stages; for example, juvenile have pale-red and black patterns that provide short-distance , while adults shift to bright yellow stripes for prey attraction. in pattern intensity is evident, as females in Argiope and often show more vivid and extensive markings than the duller males, aiding in species recognition. Evolutionarily, coloration in orb-weavers balances mate attraction through sexually selected bright signals with predator deterrence via or , as seen in the red-and-black patterns of , where bold contrasts serve dual roles in signaling to conspecifics and warning avian predators in tropical habitats. This polymorphism persists due to conflicting selective pressures, promoting adaptive diversity across populations.

Habitat and Distribution

Global Distribution

Orb-weaver spiders (family Araneidae) exhibit a , with over 3,160 valid species recorded across all continents except (as of November 2025). This widespread presence spans diverse biogeographic realms, from arid deserts to lush forests, reflecting the family's adaptability to varied climates while avoiding extreme polar environments due to physiological limitations in tolerating prolonged subzero temperatures. Species diversity peaks in tropical regions, particularly in and , where environmental stability and habitat complexity support high and rates. For instance, South American Araneidae contribute significantly to the continent's arachnid biodiversity, with numerous genera confined to neotropical hotspots. Introduced species further illustrate human-mediated range expansions; , originating from South and Central American tropics, has established populations in southeastern , likely facilitated by historical shipping and trade routes. Similarly, the Asian has invaded the since around 2013, spreading rapidly via anthropogenic transport such as cargo containers; as of 2025, it has established populations in Georgia, , , and other southeastern states. Altitudinally, orb-weavers occupy elevations from to high montane zones, with some Andean thriving up to approximately 3,650 meters in ecosystems, where cooler temperatures and sparse vegetation challenge their web-building behaviors. No native populations exist in polar regions, as the family's metabolic and developmental processes are ill-suited to or conditions, limiting them to latitudes supporting seasonal availability. Population densities vary geographically and temporally; in temperate zones, abundances surge during summer months when warm weather enables rapid growth and web construction, often declining with the onset of colder seasons. Some vagrant orb-weaver , such as juveniles of , undertake seasonal ballooning migrations, dispersing via silk threads carried by winds to colonize new areas.

Preferred Habitats

Orb-weaver spiders (family Araneidae) predominantly select open areas supported by vegetation or structures suitable for web attachment, including gardens, forest edges, meadows, and urban features such as fences and buildings. These microhabitats provide stable anchor points like branches, shrubs, or artificial surfaces while allowing access to flying prey. For instance, species like favor structurally complex vegetation in old fields and clearings to facilitate web placement. These spiders thrive in warm, moist environmental conditions, typically 20–30°C with moderate to high levels (50–70% relative humidity), which optimize web tensile properties and prey interception efficiency through mechanisms like silk supercontraction. Webs are often positioned in locations exposed to to enhance delivery of airborne , though spiders orient them parallel to wind direction to minimize structural damage from gusts. Such preferences align with their global distribution in temperate to tropical regions, where these conditions predominate. Vertical stratification is evident across species, with some orb-weavers occupying low shrubs (0.1–0.5 m above ground) in forested gaps or stream corridors, while others, such as golden orb-weavers (Trichonephila spp.), construct expansive webs in the canopy of tall trees for access to larger flying prey. This partitioning reduces competition and exploits layered prey resources in complex habitats. Orb-weavers demonstrate strong adaptability to disturbed environments, frequently colonizing agricultural fields, grasslands under , and secondary forests regenerating after , where simplified still offers sufficient supports. In these areas, may decline compared to primary forests, but abundance remains high due to increased edge habitats and availability. Microclimate selection plays a key role in survival, with webs strategically placed in sunny exposures to facilitate and maintain optimal body temperatures, while avoiding direct rainfall to prevent web degradation. This behavior is particularly noted in species like , which adjust positions to balance solar gain and moisture retention.

Web Construction

Types of Webs

Orb-weaver spiders in the family Araneidae primarily construct classic orb webs, characterized by a framework of radial spokes extending from a central hub, connected by a non-sticky auxiliary spiral that is later replaced by a sticky capture spiral wound concentrically around the radials. These webs function as passive traps to intercept flying , with the sticky spiral providing adhesion upon impact. In large species such as those in the genus (now often classified under Trichonephila), webs can reach diameters exceeding 1 meter, enabling capture of sizable prey. Variations in web architecture occur across genera, including the incorporation of funnel-shaped retreats attached to the orb periphery, where the spider rests during inactivity or adverse conditions; for instance, quadratus females build such tubular retreats adjacent to their webs for shelter. Some species exhibit reduced orb structures, particularly vagrant hunters like those in the genus Mastophora, which forgo extensive radial frameworks in favor of minimal lines. In specialized cases, Mastophora females employ a web—a single thread tipped with an adhesive droplet swung to ensnare moths mid-flight, representing an extreme modification of the orb design. Certain orb-weavers form colonial aggregations with interconnected webs, as seen in Metepeira , where individual orb webs are linked into larger sheet-like communal networks spanning multiple square meters, facilitating group defense and resource sharing without full social cooperation. Many orb-weaver webs feature a , a conspicuous or disk of thickened at the center or hub, potentially serving as a visual signal to deter collisions or enhance against foliage; experimental evidence indicates that webs with stabilimenta experience fewer accidental damages from vertebrates. The exact function may vary by species and habitat, with some studies supporting a role in prey attraction via UV reflectance, though defensive benefits predominate in open environments.

Building Process

Orb-weaver spiders produce from specialized spinnerets located at the abdomen's tip, utilizing distinct glands to create different types tailored to web construction needs. The major ampullate glands secrete dragline , a strong, non-sticky used for structural elements like frame threads and radials due to its high tensile strength and elasticity. The minor ampullate glands produce auxiliary spiral , which is thinner and more elastic for temporary support. The flagelliform glands generate the core of the sticky capture spiral, a highly extensible coated with viscous glue from aggregate glands to ensnare prey. The building process begins with site exploration, where the spider releases a silk thread carried by the wind to form a bridge thread, spanning gaps between supports—often up to 6 meters in species like —to establish the initial anchor. Frame threads are then attached using dragline silk to outline the web's perimeter, followed by the addition of radial threads, typically 15 to 30 spokes extending from a central hub for skeletal support. A temporary auxiliary spiral is laid outward from the hub along the radials to provide stability during construction, after which the spider removes it while spiraling inward to attach the permanent sticky capture spiral. This entire sequence, from bridge to completion, takes 30 to 60 minutes in most species, such as . Site selection prioritizes areas with high prey abundance, like paths, and low wind interference to ensure stable web placement. Orb-weavers maintain their webs through daily dismantling, typically at dawn or dusk, by consuming the old structure to recycle a significant portion of the proteins for in the new web, which conserves energy and glandular resources. Rebuilding occurs shortly after, often at dusk to capitalize on nocturnal activity. This routine is particularly pronounced in females, who invest more in larger webs prior to to maximize prey capture for egg production. Constructing a web requires significant energy, with the comprising 10 to 20% of the spider's body , underscoring the metabolic cost of this behavior.

Behavior and Predation

Hunting Strategies

Orb-weaving spiders primarily detect prey through transmitted along the threads of their webs. When an collides with the web, the struggling movements generate tension and that propagate to the , typically positioned at the hub. The senses these signals via sensory hairs and slit sensilla on its legs, allowing it to pinpoint the prey's location with high precision. Upon detection, the rapidly moves along the radial threads toward the ensnared prey, often covering distances up to several centimeters in seconds to prevent escape. Once at the prey, orb-weavers immobilize it by wrapping it in silk bands produced from their spinnerets, a process that secures the victim and protects the spider from potential counterattacks. This wrapping behavior is particularly efficient for soft-bodied insects such as flies (Diptera) and moths (), which constitute the majority of their diet—up to 67% Lepidoptera and 9% Diptera in studied populations—due to the ease of subduing and consuming them compared to harder-shelled prey. The silk wrapping not only restrains the prey but also allows selective feeding, where the spider extracts liquefied internal tissues while discarding indigestible parts like exoskeletons. In certain non-orb-weaving genera within the Araneidae, such as Mastophora, a specialized has evolved. These spiders produce a single adhesive droplet at the end of a short thread, mimicking female pheromones to lure male moths into range. The spider then swings or flicks the bolas toward the approaching moth, ensnaring it with the sticky mass for subsequent reeling in and consumption; this method achieves capture success rates as high as 83% in observed trials, targeting moths specifically due to their zig-zag flight response to the chemical lure. Prey size preferences in orb-weavers are influenced by , with thread tension and mesh size tuned to the common local fauna, optimizing capture of prevalent small to medium-sized flying averaging 91 mg in mass. Larger species construct bigger webs capable of stopping heavier prey, such as grasshoppers () exceeding 200 mg, thereby maximizing total intake rather than relying solely on rare large items, which contribute less than 2% of captured energy.

Venom and Defense

Orb-weaver spiders (family Araneidae) produce venom consisting of a complex mixture of neurotoxins, enzymes, and peptides that facilitate prey immobilization and digestion. The neurotoxins are primarily cysteine-rich peptides (3-9 kDa) featuring an inhibitor cystine knot (ICK) motif, which target voltage-gated ion channels such as sodium (NaV), calcium (CaV), and potassium (KV) channels. Enzymes like hyaluronidases and phospholipases serve as spreading factors to enhance venom distribution within prey tissues, while antimicrobial and cytolytic peptides disrupt cell membranes and contribute to overall toxicity. On prey, primarily insects, the venom induces rapid paralysis by disrupting ion channel function, leading to neuromuscular blockade and immobilization within seconds to minutes. For instance, in species like Araneus ventricosus, over 200 toxin-like precursors have been identified, enabling efficient subduing of flying insects caught in webs. Examples of specific neurotoxins include acylpolyamines such as argiotoxin-636 from Argiope lobata, which block calcium-permeable AMPA receptors and induce paralysis. In defense, orb-weavers employ behavioral mechanisms alongside venom, such as adopting a threat posture by raising their front legs to deter predators like birds or wasps. They may also release silk threads or abandon and drop from the web to escape threats, using the silk as a lifeline for rapid retreat. Certain genera, like Gasteracantha, feature spiny exoskeletons on the abdomen that physically deter predators such as hunting wasps, reducing successful attacks. Interactions with humans are rare and typically non-lethal, as orb-weaver exhibits low mammalian toxicity and is adapted for prey. Bites, if they occur, cause only mild local effects such as , redness, or swelling, resolving without intervention in most cases. Severe envenomations are virtually unknown, with global fatalities under five per year, none attributed to Araneidae. Evolutionarily, venom potency in orb-weavers varies with prey specialization; for example, bolas spiders in the genus Mastophora emphasize silk-based capture using pheromone-mimicking bolas to ensnare moths, relying less on potent for initial immobilization and more on it for post-capture digestion. This adaptation reflects an with flying prey, where venom components evolve to counter resistance while conserving energy for web-building species.

Reproduction

Mating Behaviors

Orb-weaver spiders exhibit pronounced sexual dimorphism, with s typically 4 to 10 times smaller than s, a trait that facilitates s' ability to approach and enter webs stealthily without immediate detection. This dimorphism is linked to evolutionary pressures in dynamics, where smaller enhances mobility for locating receptive s. activity peaks during warm seasons, driven by protandry, in which s mature faster than s to arrive at webs when s are most receptive, often shortly after molting. Male courtship begins with cautious approaches to the female's orb web, where males produce vibrations by plucking silk strands to signal their presence and intent, reducing the risk of aggressive responses. Once on the web, copulation involves the male using his pedipalps, modified into emboli, to transfer sperm directly into the female's spermathecae; this process can occur multiple times per individual, as both sexes are capable of remating. In genera such as Argiope, males execute a rapid somersault maneuver during copulation to position themselves away from the female's fangs, minimizing retaliation risks. To secure paternity, males often employ guarding behaviors, including breaking off their emboli as mating plugs to block subsequent suitors from accessing the spermathecae. Sexual conflicts are prominent in orb-weaver mating, particularly through sexual cannibalism, where females consume males during or after copulation, providing the female with nutritional benefits for egg production. In species like Argiope bruennichi, this behavior occurs in up to 80% of matings with mature females, though rates are lower with recently molted females due to reduced aggression. Such cannibalism underscores the high stakes of copulation, balancing male reproductive success against female foraging gains.

Egg Laying and Development

Female orb-weaver spiders typically oviposit in late summer or autumn, producing one or more silken sacs containing hundreds to several hundred . These sacs are multilayered structures composed of from tubuliform and other glands, providing physical protection against predators, parasitoids, and environmental extremes while often featuring through debris attachment or coloration. In many species, females exhibit limited by guarding the sacs continuously until their shortly after oviposition, a semelparous strategy common in the family Araneidae. While extended care like web-sharing with juveniles occurs rarely in orb-weavers, the primary investment focuses on sac construction and initial protection. Eggs hatch after 11–30 days, depending on , though in temperate regions, spiderlings often remain within the sac through winter, emerging in spring as tiny replicas of adults. In tropical regions, development may allow multiple generations per year without . Upon emergence, the spiderlings undergo ballooning dispersal, releasing threads to float on air currents and colonize new areas. Development proceeds through simple , with juveniles passing through 7–12 instars via periodic molting, typically every 1–2 weeks in early stages under favorable conditions. Total lifespan is generally 1 year, though females often outlive males by several months, reaching maturity in summer before reproducing. In temperate zones, orb-weavers follow annual seasonal cycles, with eggs or early juveniles overwintering in protected sacs to synchronize hatching with spring resource availability. This ensures survival through cold periods, allowing populations to renew each .

Taxonomy

Classification and Phylogeny

The orb-weaver spider family Araneidae belongs to the order Araneae, suborder , and superfamily Araneoidea, representing one of the most diverse groups of web-building spiders. The family is characterized by its ecribellate nature and is distinguished from related families like Tetragnathidae through morphological and molecular traits, though historical classifications have sometimes debated the boundaries of subfamilies such as Araneinae and others. Current recognizes several subfamilies within Araneidae, including Araneinae, Argiopinae, and Gasteracanthinae, based on phylogenetic analyses that integrate genetic and morphological , although these divisions remain subject to revision due to ongoing molecular studies. Recent studies debate the status of subfamilies like Nephilinae and Phonognathinae, with some elevating them to family level (Kuntner et al., 2023), while others retain them within Araneidae (Hormiga et al., 2023; Eskov & Marusik, 2024). Phylogenetically, Araneidae originated during the period, approximately 200 million years ago, with orb-weaving emerging as an ancestral trait within the broader Araneoidea . Molecular clock analyses, calibrated using fossil records, indicate that the family's diversification accelerated in the , coinciding with the radiation of angiosperms and potential co-evolutionary dynamics in web architecture and prey capture. Key synapomorphies defining Araneidae include the construction of planar orb webs, the presence of a reduced colulus (a vestigial structure), and the loss of the , which distinguishes them from cribellate orb-weavers like those in . These traits underscore the family's , supported by multi-gene phylogenies that resolve Araneidae as a well-defined within Araneoidea. The fossil record provides critical evidence for the family's evolutionary history, with the oldest known araneid, Mesozygiella dunlopi, preserved in amber from , dating to approximately 110 million years ago. This specimen exhibits characteristic araneid features, such as eye arrangement and leg spination, confirming the presence of true orb-weavers by the Lower stage. Later fossils, including amber-preserved orb webs from the Eocene (around 40 million years ago), demonstrate continuity in web-building , with silk strands and adhesive structures analogous to modern Araneidae. Modern taxonomic revisions, as documented in the , recognize 198 genera within Araneidae as of 2025, reflecting ongoing integrations of fossil, morphological, and genomic data to refine the family's phylogeny.

Diversity and Genera

The orb-weaver spider family Araneidae exhibits remarkable diversity, with 3,160 valid species classified across 198 genera as of November 2025. This family ranks as the third most speciose among spiders globally, with the majority of species concentrated in tropical regions of the Americas, Africa, and Asia, where environmental complexity supports varied web architectures and ecological niches. Ongoing taxonomic research continues to uncover new diversity, including over 50 novel species described since 2020, often from understudied tropical hotspots such as Yunnan Province in China, where six new genera and 20 species were recently documented. Prominent genera within Araneidae highlight this family's morphological and behavioral variation. The genus includes 89 accepted , commonly referred to as garden spiders, which are noted for their orb webs adorned with —zigzag silk patterns that may serve in prey attraction or camouflage. Similarly, (formerly part of ) encompasses about 11 of golden orb-weavers, renowned for constructing exceptionally large, durable webs that can span several meters and occasionally form communal networks in tropical forests. These genera exemplify the family's pantropical distribution, with widespread across temperate and subtropical zones as well. Specialized groups further underscore Araneidae's . The Gasteracantha, with approximately 88 , comprises spiny orb-weavers distinguished by their hardened, ornamented abdomens bearing sharp projections, adaptations possibly linked to defense or mate attraction in diverse habitats. In contrast, Mastophora features around 50 of bolas spiders, which employ a unique hunting strategy involving silk scented with pheromones to capture prey, diverging from typical orb construction. Regionally, Araneidae diversity is pronounced in the Nearctic, with approximately 180 species north of and over 400 when including Central American extensions, supporting varied ecosystems from forests to grasslands. Australia hosts endemic genera such as Backobourkia, a small group of three species closely related to Eriophora, adapted to arid and temperate environments with robust orb webs. Conservation challenges affect certain taxa, particularly island endemics vulnerable to habitat loss from and ; for instance, Hawaiian Araneidae populations, including introduced but ecologically integrated species like Argiope appensa, face pressures that threaten localized diversity.

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