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Pill millipede
Pill millipede
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Pill millipedes
An Arthrosphaera fumosa giant pill millipede from India.
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Myriapoda
Class: Diplopoda
Subclass: Chilognatha
Infraclass: Pentazonia
Superorder: Oniscomorpha
Pocock, 1887 [1]
Orders
Synonyms

Armadillomorpha Verhoeff, 1915

Pill millipedes are any members of two living (and one extinct) orders of millipedes, often grouped together into a single superorder, Oniscomorpha. The name Oniscomorpha refers to the millipedes' resemblance to certain woodlice (Oniscidea), also called pillbugs or roly-polies. However, millipedes and woodlice are not closely related (belonging to the subphyla Myriapoda and Crustacea, respectively); rather, this is a case of convergent evolution.

Description

[edit]

Pill millipedes are relatively short-bodied compared to most other millipedes, with only eleven to thirteen body segments,[2] and are capable of rolling into a ball (volvation) when disturbed, as a defense against predators. This ability evolved separately in each of the two orders, making it a case of convergent evolution, rather than homology. They can also exude a noxious liquid, which may be both caustic and toxic among other millipede taxa, but is not in pill millipedes——Glomerida secretes a clear, odorless liquid from the midline of the back that contains toxic alkaloids and has a sedative effect to repel predators. Sphaerotheriida don't even have such ability; they completely rely on their hard shell to defend against enemies.[3] Pill millipedes are detritivorous, feeding on decomposing plant matter, usually in woodlands.[4]

Comparison of a pill millipede (above: Glomeris marginata) and a pillbug (below: Armadillidium vulgare)

Orders

[edit]

Glomerida

[edit]
Main article: Glomerida

The order Glomerida is predominantly found in the Northern Hemisphere and includes species such as Glomeris marginata, the common European pill millipede. They have from eleven to twelve body segments, and possess dorsal ozopores (openings of the repugnatorial glands) rather than the lateral ozopores found on many other millipedes.[3] Glomeridans reach maximum lengths of 20 mm (0.79 in), and eyes, if present, are in a single row of ocelli.[5] The order contains approximately 450 species[6] found in Europe, South-east Asia and the Americas from California to Guatemala.[7] Four species are present in the British Isles.[8]

Sphaerotheriida

[edit]
Main article: Sphaerotheriida

The order Sphaerotheriida is a Gondwana-distribution taxon, with around 350 species in southern Africa, Madagascar,[9] Australasia[10] and South East Asia.[7] Five species, all in the genus Procyliosoma are present in New Zealand,[10] and around thirty species are present in Australia.[11] Sphaerotheriidans have thirteen body segments, and do not possess repugnatorial glands. Spherotheriidans reach larger size than Glomeridans (up to 10 cm (3.9 in)), and always possess large, kidney-shaped eyes.[5]

Amynilyspedida

[edit]

Oniscomorpha also includes the extinct order Amynilyspedida from the upper Carboniferous of North America and Europe.[2][12] Amynilyspedida differs from the other Oniscomorph orders in having 14–15 segments.[13] The order contains the genus Amynilyspes with unique spines on the tergites, as well as Glomeropsis, Archiscudderia, and Palaeosphaeridium.[2]

References

[edit]
[edit]
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Pill millipede

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from Grokipedia
Pill millipedes are stout-bodied millipedes belonging to the orders Glomerida (predominantly in the ), Sphaerotheriida (primarily in the ), and the extinct Amynilyspedida, distinguished by their ability to roll into a compact spherical , known as conglobation, as a defensive mechanism against predators. These arthropods, classified within the class Diplopoda and infraclass Pentazonia, typically feature hard, shiny exoskeletons, short legs, and a segmented body with 11 to 13 tergites, enabling the complete enclosure of their head and appendages during coiling. In the , of the order Glomerida, such as those in the genus Glomeris, inhabit moist, soils in forests and grasslands, often under leaf litter or stones, and are active in temperate regions of , , and . Glomerida generally measure 1–3 cm in length and contribute to by feeding on decaying matter. Conversely, , sometimes called giant pill millipedes, occur in disjunct Gondwanan distributions including , , , and , where they prefer humid forest understories and can reach sizes up to 10 cm, with some exhibiting favoring larger females. Both orders play ecological roles as saprophagous detritivores, processing leaf litter and enriching through nutrient-rich fecal pellets that increase microbial diversity and nutrient availability, such as and . Defensive strategies beyond conglobation include the release of irritating chemicals, like in some species, which produce an almond-like odor detectable by humans. Approximately 600 valid species exist across these orders, with ongoing discoveries highlighting their and sensitivity to changes like and texture.

Morphology

Body structure

Pill millipedes possess a compact, segmented body adapted for defensive enrollment, consisting of 12 to 13 body rings in adults. The body is divided into a head and a trunk, with the trunk further differentiated into and abdominal regions; the includes a legless collum followed by segments bearing one or two pairs of legs, while the comprises the remaining diplosegments with two leg pairs each. The head features a pair of short, curved antennae used for sensory perception, and eyes are absent or rudimentary (as ocelli) in many Glomerida species, while possess compound eyes with numerous ocelli. Many segments bear keels or lateral projections, such as paranota or carinae, which provide and aid in during enrollment. These projections, often horny and curved, overlap slightly and include locking mechanisms on the inner tergite surfaces to maintain a secure spherical form. When extended, adults typically measure 1 to 10 cm in length, with Glomerida species generally 1-3 cm and up to 10 cm; some species exhibit , with females larger than males. The , or , is highly calcified, incorporating that imparts exceptional hardness and rigidity, enabling the animal to form a protective ball without structural damage. This mineralization, reaching up to 122 mg of calcium per gram of dry mass in some species, contributes to the shiny, tergite-covered appearance and overall durability of the body.

Defensive adaptations

Pill millipedes exhibit a remarkable defensive known as or conglobation, in which they enroll their body into a near-perfect to protect vulnerable appendages such as legs and antennae. This is facilitated by specialized sutures and emarginations along the tergites, particularly in the orders Glomerida and , allowing the short, subcylindrical segments to interlock tightly with robust musculature supporting the enrollment. When disturbed by stimuli such as touching or mechanical pressure, the millipede rapidly withdraws its head and limbs, forming a rigid ball that shields soft tissues beneath hardened dorsal plates. In addition to physical enrollment, many in Glomerida deploy chemical defenses through repugnatorial glands, which secrete foul-smelling and irritating compounds to deter predators. These glands, located dorsally with ozopores on specific tergites (typically 4–11), release quinone-based secretions or other volatile chemicals when the animal is threatened, often in coordination with . For instance, in like Glomeris marginata, the secretions contain and , which are slowly replenished over months, providing prolonged protection against repeated attacks. This chemical strategy complements the mechanical barrier of enrollment, enhancing overall survival in predator-rich environments. lack repugnatorial glands and rely primarily on conglobation. Once enrolled, pill millipedes enter a state of tonic immobility, remaining rigidly motionless for durations that can extend from 62 seconds on initial disturbance to over 90 seconds with repeated threats, effectively mimicking an inanimate object like a seed or stone to avoid detection. This prolonged rigidity, often lasting hours in natural conditions, relies on the interlocking sutures to maintain structural integrity against external pressure. The defense provides a significant evolutionary advantage in exposed habitats, where open leaf litter or surfaces increase predation risk, by concealing sensory organs and reducing . evidence from the period (approximately 305 million years ago) reveals early pill millipede-like forms, such as Amynilyspes fatimae, with morphological features including overlapping tergal margins and antennal grooves indicative of volvation capability, suggesting this adaptation originated over 300 million years ago.

Taxonomy

Classification

Pill millipedes are classified within the class Diplopoda, the millipedes, which belongs to the subphylum in the phylum Arthropoda. They are part of the subclass Chilognatha, characterized by gnathochilarium mouthparts, and fall under the infraclass Pentazonia, a monophyletic group that includes orders capable of defensive coiling. The term "pill millipede" refers to a polyphyletic assemblage defined by the ability to fully enroll the body into a protective (), a trait that has evolved convergently across multiple lineages rather than indicating a single . The primary living orders comprising pill millipedes are Glomerida (northern hemisphere pill millipedes) and (giant southern hemisphere pill millipedes), with approximately 300 species in Glomerida and over 350 in , totaling more than 650 described species. These orders were traditionally grouped in the superorder Oniscomorpha, but phylogenomic analyses reject this as monophyletic, placing Glomerida and in separate lineages within Pentazonia alongside the non-enrolling Glomeridesmida. An extinct order, Amynilyspedida, also exhibited pill-like enrollment and is considered part of this broader polyphyletic group. Phylogenetic relationships have been elucidated through molecular data, including nuclear transcriptomes and ribosomal genes such as 18S rRNA, demonstrating that arose independently at least four times in Diplopoda, including in Glomerida and . These studies highlight driven by similar selective pressures for defense, with Pentazonia diverging around 467 million years ago. Historically, the classification of pill millipedes began in the early , with establishing the order Glomerida in 1814 based on morphological traits like body segmentation. Subsequent revisions incorporated , initially described under genera like Cryxus by Leach in 1814. Modern updates in the 2020s integrate of the COI gene to refine species boundaries and resolve cryptic diversity, as seen in recent descriptions from and .

Glomerida

The order Glomerida, formerly classified within the superorder Oniscomorpha of the class Diplopoda, is characterized by its dominant family Glomeridae, alongside two other families: Glomeridellidae and Doderiidae. This order includes approximately 300 valid species distributed across about 30 genera. A well-known representative is Glomeris marginata, the common European pill millipede, which exemplifies the group's typical morphology and behavior. Glomerida species are primarily confined to the of the , occurring in , , and , but are notably absent from tropical regions. Their distribution reflects an affinity for temperate climates, with populations often inhabiting leaf litter, , and under bark in forests. These millipedes are generally smaller than those in related orders, reaching lengths of up to 2 cm, and exhibit a compact, cylindrical body that facilitates defensive enrollment into a tight . Coloration is typically dark, such as black or brown, with contrasting pale or yellow margins on the tergites, providing subtle in humus-rich environments; for instance, G. marginata is shiny black with whitish edges. Unique to Glomerida are their repugnatorial glands, which produce defensive secretions composed primarily of quinazolinone alkaloids, such as glomerin (1,2-dimethyl-4-quinazolone) and homoglomerin (1-methyl-2-ethyl-4-quinazolone), that deter predators with their bitter taste and irritant properties. These chemical defenses, secreted through mid-dorsal openings, complement the physical protection offered by enrollment, enhancing survival in predator-rich temperate habitats. The fossil record of Glomerida dates back to the Eocene epoch, with well-preserved specimens in providing evidence of their ancient temperate origins and morphological stability over millions of years; a notable example is Hyleoglomeris baltica, described from Upper Eocene deposits, representing one of the oldest known fossils of extant pill millipedes. This inclusion highlights the order's persistence in forested, humid paleoenvironments similar to modern habitats.

Sphaerotheriida

is an order of giant pill-millipedes within the infraclass Pentazonia, distinguished by their ability to enroll into a complete spherical defensive posture. The order encompasses multiple families, including Sphaerotheriidae, with a total of approximately 351 valid distributed disjunctly across the . In , particularly and , around 55 occur, all endemic to this region and belonging primarily to the family Sphaerotheriidae. Prominent among southern African Sphaerotheriida are giant forms in the genus Sphaerotherium, exemplified by S. giganteum, which attains a body length of up to 55 mm when extended and enrolls into a ball approximately 40 mm in diameter—the largest such volume among regional millipedes. These species contribute to the order's for substantial relative to other pill-millipedes, with southern African representatives often exceeding 20-30 mm in length. Some Sphaerotheriida display striking coloration, including reddish bands or darker hues with contrasting patterns, though vivid reds and blues are more characteristic of certain Madagascan taxa. They typically inhabit moist microhabitats such as leaf litter in shrublands and forests, where they forage on decaying . Recent taxonomic advancements in the 2020s have expanded knowledge of through integrative approaches combining morphological examination and genetic sequencing. For instance, seven new species were described from in 2021, revealing extensions of the order's diversity in isolated forest fragments and underscoring ongoing discoveries in peripheral ranges like southeastern . These findings highlight the order's microendemism and vulnerability to habitat loss, with southern African populations similarly concentrated in biodiversity hotspots.

Amynilyspedida

The Amynilyspedida is an extinct order of pill millipedes (Diplopoda: Oniscomorpha) known exclusively from Late Carboniferous fossils, dating to approximately 315–300 million years ago during the Westphalian and Stephanian stages. It comprises a single family, Amynilyspidae, and the genus Amynilyspes, with at least three described species: the type species A. wortheni from and A. hamatus and A. montceauensis from . These millipedes represent an early evolutionary lineage of volvation-capable arthropods, sharing convergent defensive traits like body enrollment with modern Glomerida and , though their spiny morphology suggests a distinct adaptation for protection. No living representatives exist, and the order's limited diversity underscores its rarity in the fossil record. Fossils of Amynilyspedida have been recovered from two major lagerstätten: the Mazon Creek deposits (Francis Creek Shale) in , USA, and the Montceau-les-Mines site in . Specimens typically measure 15–30 mm in length, featuring 14 tergites—more than the 11–13 seen in extant pill millipedes—and prominent spines on the dorsal terga, which likely enhanced defensive posturing during enrollment. Some individuals exhibit large, well-developed eyes, indicating a potentially more active lifestyle compared to their modern relatives, while the overall body is robust and cylindrical when extended, adapted for rolling into a protective ball. The order was formally established by in 1969 based on morphological characteristics distinguishing it from other oniscomorphs, with subsequent species descriptions in 2004 and 2016 refining its taxonomy through detailed comparative anatomy. Paleobiological inferences place Amynilyspedida in humid, vegetated swamp environments, where they likely functioned as detritivores, feeding on decaying matter in litter. The exceptional preservation in concretions at Mazon Creek and coal mine shales at Montceau-les-Mines reveals fine details of their , supporting interpretations of a terrestrial in tropical, coal-forming wetlands. Their extinction by the early Permian may relate to broader environmental shifts, such as drying climates, though specific causes remain unconfirmed due to the scarcity of fossils.

Biology

Reproduction

Pill millipedes engage in characterized by indirect sperm transfer, in which males lack traditional gonopods but instead utilize enlarged telopods on the eighth leg pair to deposit that the female subsequently picks up for fertilization. rituals typically begin with antennal contact between partners, and in some , males produce stridulatory sounds upon physical contact to discourage the female from rolling into a defensive ball, facilitating successful transfer. is minimal overall, though males possess these specialized telopods adapted for spermatophore deposition, distinguishing them from females. In Glomerida, such as species of the genus Glomeris, females deposit clutches of 70–80 eggs in moist soil, each individually encased in a capsule formed from digested earth; clutch sizes vary by order, with Sphaerotheriida producing hundreds of eggs per season. These eggs hatch after approximately two months under typical conditions, though cooler temperatures may extend incubation to several months. Juveniles emerge resembling miniature adults and undergo 7–8 instars, adding segments and legs with each molt; they reach in 1–2 years. In species of the genus Glomeris, females exhibit by guarding clutches and early juveniles, often carrying them in an enrolled position for protection. Variations in reproductive strategies occur across orders, such as paternal brood care recently documented in some Glomerida .

Diet and locomotion

Pill millipedes are primarily detritivores, consuming decaying matter such as leaf , rotting wood, and fungi, which they ingest from the forest floor or layers. like Glomeris can consume between 1.7% and 10% of annual leaf production in their habitats, equivalent to roughly 10 times their body mass over a year, with a preference for partially decomposed material over fresh due to lower phenolic content and higher microbial availability. Some occasionally scavenge dead or other animal remains, supplementing their when available. In terms of locomotion, pill millipedes display a slow, waddling powered by two pairs of parapodial legs per body segment, enabling coordinated, wave-like movement across substrates. This parapodial arrangement, typical of diplopods, allows for stable progression despite their cylindrical or compact bodies. Their leg coordination follows a metachronal wave pattern, where waves of leg motion propagate from front to rear, facilitating efficient crawling over uneven terrain like leaf litter or soil. Foraging behavior in pill millipedes is predominantly nocturnal or crepuscular, with individuals emerging at dusk or night to reduce predation risk and desiccation. They rely on chemosensory antennae to detect chemical cues from decomposing organic matter, guiding them toward suitable food sources in dark environments. Burrowing with their head and anterior segments allows access to buried litter, where they methodically consume and process material before producing nutrient-enriched fecal pellets. Nutritional adaptations include symbiotic gut microbes that assist in decomposing complex plant polymers like and through enzymatic activity, such as xylanase production, enabling efficient nutrient extraction from recalcitrant . These microbes, including and fungi, also contribute to the assimilation of up to 73.5% of microbial in the diet, enhancing overall energy yield. To support their calcified , pill millipedes actively intake calcium from soil particles and , favoring calcium-rich substrates to maintain structural integrity during molting cycles.

Ecology

Habitat and distribution

Pill millipedes, belonging to the orders Glomerida and , exhibit a global distribution primarily confined to temperate and subtropical zones. The Glomerida are predominantly Holarctic, occurring across , , and , with species like those in the genus Glomeris widespread in deciduous forests of these regions. In contrast, the are centered in the , including , , and extending to parts of , , and (particularly and ). No species are truly aquatic or adapted to arid deserts, reflecting their reliance on mesic environments. These millipedes prefer moist microhabitats such as leaf litter, under logs and rocks, and within organic-rich of and grasslands, where they contribute to processes. They thrive in environments with high levels of 70-90% and that supports their respiratory and osmoregulatory needs, often correlating positively with rainfall and temperature in and settings. Such habitats provide the necessary calcium and , with abundance peaking in upper horizons of mixed . Biogeographically, the southern orders like trace their origins to , evidenced by their disjunct distribution across former Gondwanan landmasses such as , , , and , with notable and absence from . Conversely, Glomerida exhibit Laurasian affinities, aligning with plate reconstructions and showing diversification in temperate Holarctic regions. Recent studies from the 2020s document range shifts due to climate change, including poleward expansions in ; for instance, in the , multiple have extended their upper elevational limits by an average of 161 meters over the past century, accompanying a 1.5°C temperature rise.

Predators and interactions

Pill millipedes face predation from a variety of animals, including birds, amphibians, reptiles, small mammals, and such as spiders and assassin bugs. Birds, for instance, may attempt to peck at the defensive "pill" formed by enrolled individuals, while amphibians like toads and like woodlouse spiders target them in leaf litter habitats. Their chemical defenses, secreted from repugnatorial glands, significantly deter these predators; for example, compounds in the secretions of Glomeris marginata induce in attacking spiders, preventing successful capture. In ecological interactions, pill millipedes serve as key decomposers in food webs, consuming decaying litter and facilitating cycling by breaking down and releasing minerals back into the . Their fecal pellets enrich through microbial processing in the gut, promoting carbon and turnover in forest ecosystems. Additionally, they occasionally form associations with arbuscular mycorrhizal fungi, disseminating viable spores through their feces, which aids fungal distribution in humid forest . Human activities impact pill millipedes through collection for the pet trade, particularly colorful species like those in the order, which are sold commercially in regions such as and . Their invasive potential remains low, as most require consistently high and specific microhabitats, limiting establishment outside native ranges. Pill millipedes host symbiotic relations with various organisms, including nematodes from the Rhigonematoidea superfamily that exhibit balanced , potentially aiding host survival through regulated interactions, and phoretic mites that may assist in grooming by removing debris or pathogens from the . Mutualistic in their gut support of lignocellulosic material, enhancing the millipedes' digestive efficiency.

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