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Incirrata
An octopus active during the night in the coastal waters of northern East Timor
An unidentified octopus observed on East Scotia Ridge at a depth of 2,394 m
(scale bar: 10 cm)[1]
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Octopoda
Suborder: Incirrata
Grimpe, 1916
Families
Synonyms
  • Incirrina

Incirrata (or Incirrina) is a suborder of the order Octopoda. The suborder contains the classic "benthic octopuses," as well as many pelagic octopus families, including the paper nautiluses. The incirrate octopuses are distinguished from the cirrate octopuses by the absence in the former of the "cirri" filaments (found with the suckers) for which the cirrates are named, as well as by the lack of paired swimming fins on the head, and lack of a small internal shell (the "shell" of Argonauta species is not a true shell, but a thin calcite egg case). This is except for the Sepioidea.[2]

Classification

[edit]

Note: A new unnamed white species was discovered February 26, 2016 by NOAA's Deep Discoverer about 2.5 miles below the ocean surface near the Hawaiian Archipelago.[3]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Incirrata

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from Grokipedia
Incirrata, also known as Incirrina, is a suborder within the order Octopoda of the class , encompassing the majority of species characterized by the absence of cirri—fleshy, hair-like projections—on their suckers and the lack of fins, in contrast to the deep-sea suborder Cirrata. These cephalopods typically feature eight muscular arms lined with two rows of suckers, a soft, flexible body without an external shell (though some retain vestigial internal stylets), and advanced abilities for through rapid changes in color, texture, and pattern via chromatophores. Incirrata species are predominantly benthic, dwelling on the seafloor, but include pelagic forms that swim in open water, occupying diverse marine habitats from intertidal zones to abyssal depths beyond 2,000 meters. Taxonomically, Incirrata is divided into two superfamilies: Argonautoidea (including pelagic genera like Argonauta and Tremoctopus) and the more diverse Octopodoidea (encompassing families like , Eledonidae, , Bolitaenidae, and Amphitretidae). This suborder boasts over 300 described species, with many more likely undescribed, representing the majority (approximately 85%) of all octopods and exhibiting high diversity in body size—from small species under 10 cm mantle length to giants like exceeding 5 meters in arm span. Phylogenetic studies suggest Incirrata diverged from Cirrata during the era, around 251–66 million years ago, with adaptations like the loss of an in some deep-sea lineages reflecting evolutionary shifts to various ecological niches. Biologically, Incirrata octopods are highly intelligent , renowned for problem-solving, tool use, and complex learning behaviors observed in and field studies, particularly in like Octopus vulgaris. They are carnivorous predators, feeding primarily on crustaceans, mollusks, and fish using their and , with many employing via a for escape and a detachable arm for in males. Lifespans are short, typically 6 months to 3 years, marked by semelparity—females brood eggs in dens until hatching, often starving to death afterward, while males deteriorate post-mating—leading to rapid growth and a single reproductive event. Ecologically significant, Incirrata serve as both predators and prey in marine webs, with commercially important like the (Octopus vulgaris) supporting global fisheries yielding tens of thousands of tonnes annually, though threatens some populations.

Description

Morphology

Incirrata, the dominant suborder of the order Octopoda, are characterized by their soft, muscular bodies lacking paired fins on the head or mantle, distinguishing them from the fin-bearing Cirrata. These octopods rely primarily on jet propulsion through the funnel and crawling or manipulation via their eight arms for locomotion, enabling efficient movement across benthic and pelagic environments. The body features a prominent mantle that varies from saccular to rounded in shape, housing the visceral mass and providing flexibility for squeezing through narrow spaces. Unlike many other cephalopods, Incirrata typically lack an internal shell, though some species possess two small cartilage rods; a notable exception is the paper nautilus (Argonauta), where females secrete a thin, chambered egg case that is not homologous to true molluscan shells but an evolutionary innovation unique to the Argonautidae. The arms of Incirrata are equipped with two rows of sessile suckers along their oral surfaces, arranged without the filamentous cirri present in Cirrata, which aids in prey capture and substrate adhesion. In males, one arm—typically the third right—is modified into a , a specialized used for transfer during . The skin exhibits a range of textures from smooth to papillated, enhanced by expandable chromatophores that allow rapid color changes for environmental matching, though behavioral applications of this camouflage are not detailed here. Size in Incirrata varies considerably, reflecting adaptations to diverse habitats; for instance, deep-sea species like certain Muusoctopus may reach mantle lengths of only 1-2 cm, while larger benthic forms such as the (Enteroctopus dofleini) can achieve arm spans up to 3 m and mantle lengths exceeding 60 cm. This morphological diversity underscores the suborder's versatility, with overall body lengths ranging from under 20 cm to over 3 m in total.

Anatomy

Incirrata, the clade encompassing most modern octopuses, exhibit a highly efficient closed circulatory system adapted to their active lifestyles in oxygen-variable marine environments. This system features three hearts: two branchial hearts that pump deoxygenated blood through the gills for oxygenation, and a single systemic heart that circulates oxygenated blood to the rest of the body. Their blood contains hemocyanin, a copper-based protein that imparts a blue color and efficiently transports oxygen in cold, low-oxygen waters, though it is less effective in warmer or acidic conditions compared to hemoglobin in vertebrates. This adaptation supports the high metabolic demands of their soft-bodied, predatory existence. The of Incirrata relies on a single pair of ctenidia, or gills, housed within cavity, which facilitate through a countercurrent mechanism that maximizes oxygen uptake from . These gills are versatile, enabling effective respiration in both benthic habitats near the seafloor, where oxygen levels can be low, and in pelagic zones for species like that inhabit midwater. Water is drawn into cavity via muscular contractions and expelled through the , integrating respiration with locomotion. Incirrata possess one of the most complex nervous systems among , with a comprising 37 lobes when subdivided, encased in a cartilaginous and encircling the . Relative to body size, this is exceptionally large, containing approximately 500 million neurons distributed across central and peripheral components, including optic lobes for visual processing and vertical lobes implicated in learning and formation. The decentralized , with about two-thirds of neurons in the arms' brachial cords, allows for sophisticated problem-solving and autonomous arm movements without constant central oversight; recent studies have shown that the brachial nervous systems in the arms are segmented, contributing to their independent functionality. The digestive system in Incirrata is streamlined for rapid processing of diverse prey, beginning with a chitinous that tears flesh and a small that rasps or drills into shells. passes through the to a for temporary storage, then to the for enzymatic breakdown and mechanical grinding, followed by nutrient absorption in the caecum. Most species possess an associated , a muscular reservoir connected to the , that ejects dark melanin-based ink through the for defensive clouding during predator encounters or feeding distractions. Unlike the elongated of optimized for sustained high-speed travel, Incirrata utilize a shorter, subconical embedded in head tissues to expel water forcefully for burst , aiding escape or precise maneuvering. This , lined with valves, draws water into cavity and directs efflux, integrating with the circulatory and respiratory systems for multifunctional efficiency. Sensory organs in Incirrata are acutely developed for their dynamic environments, featuring large camera-type eyes with complex retinas that provide high but lack , relying instead on a single pigment for sensitivity in dim light. Paired statocysts serve as balance and orientation detectors, containing otoliths and hair cells to sense and . Additionally, chemosensory pits and receptors on the arms and suckers enable taste, smell, and tactile discrimination, allowing precise environmental exploration and prey detection.

Taxonomy

Etymology

The name Incirrata derives from the Latin prefix in- ("without" or "not") and cirrus ("curl" or "filament"), alluding to the absence of cirri—fleshy, paired appendages associated with the suckers on the arms—a defining morphological feature that distinguishes incirrate octopods from their cirrate counterparts. This etymological root highlights the taxonomic emphasis on arm and sucker structure in early systematics. The suborder Incirrata was formally established by German zoologist Georg Grimpe in 1916, within his revisionary work on genera, where he delineated the group based on the lack of cirri and other traits separating it from deep-sea cirrate forms. Grimpe's built upon 19th-century foundations, including the establishment of the order Octopoda by in 1818, Georges Cuvier's 1797 description of species like Octopus vulgaris, and Alcide d'Orbigny's 1830s–1840s contributions to molluscan taxonomy, which refined groupings amid growing collections from global expeditions. In older literature, the variant spelling Incirrina occasionally appears, reflecting flexible Latinized endings in early nomenclature, but Incirrata adheres to the gender agreement and standardization prescribed by the (ICZN) and is the accepted form in contemporary usage.

Classification

Incirrata is a suborder of the order Octopoda, within the superorder Octopodiformes and class . Members of this suborder are distinguished by the absence of cirri (fleshy papillae) along the oral surfaces of the arms, lack of fins or fin-like structures, and the presence of eight muscular arms equipped with two rows of suckers but no hooks. Approximately 300 have been described in Incirrata, though this number continues to grow due to frequent discoveries in deep-sea habitats. The suborder is divided into three superfamilies, with Bolitaenoidea frequently treated as a junior synonym of Octopodoidea in modern classifications: Argonautoidea, which includes pelagic such as ; Octopodoidea, comprising mostly benthic forms alongside some pelagic taxa like those in characterized by relatively short arms; and Bolitaenoidea, featuring gelatinous-bodied pelagic octopuses. Key families within Incirrata exhibit diagnostic morphological traits reflective of their ecological adaptations. Alloposidae encompasses the seven-armed octopuses, notable for one arm being modified or reduced in males. Argonautidae includes the paper nautiluses, recognized for their females' production of a egg case resembling a shell. Ocythoidae comprises tuberculate pelagic forms with prominent papillae and gelatinous tissues. Tremoctopodidae features the blanket octopuses, distinguished by extreme where females bear large webs of modified oral membrane. Octopodidae, one of the largest families, includes common benthic octopuses such as Octopus vulgaris, identified by their robust build, short arms, and prominent white papillae on the mantle. Eledonidae consists of long-armed deep-sea species with slender bodies and reduced webbing. Megaleledonidae is represented by large benthic species adapted to cold waters, often with oversized eyes and thick mantles.

Distribution and Habitat

Geographic Range

Incirrata, the suborder comprising the majority of species, display a across all major oceans, including the Atlantic, Pacific, Indian, and Southern Oceans, spanning tropical to polar waters. This global presence is evidenced by records of incirrate octopods in benthic and pelagic habitats worldwide, with no occurrences in freshwater environments. While some genera like Benthoctopus show broad oceanic distributions, no single is truly cosmopolitan, as ranges are often confined to specific basins or latitudes. Benthic incirrate species dominate coastal continental shelves at depths of 0–200 m but extend to abyssal zones exceeding 4,000 m, with the deepest verified records reaching approximately 4,290 m in the . Pelagic forms, such as those in the genera Argonauta and Tremoctopus, inhabit open ocean midwaters, often performing diel vertical migrations to depths of several hundred meters. Most benthic species lead sedentary lifestyles tied to the seafloor, though some pelagic taxa exhibit seasonal vertical shifts influenced by reproductive cycles and prey availability. Species diversity peaks in the Indo-West Pacific region, where approximately 85% of coastal incirrate species occur, particularly in the Coral Triangle encompassing , the , and , driven by high habitat heterogeneity in shallow coral reefs and shelves. In polar waters, the hosts significant , with the family Megaleledonidae comprising the majority of endemic octopod species, such as Pareledone and Megaleledone, distributed circum-Antarctic at depths from 100 m to over 2,000 m. Notable widespread examples include Octopus vulgaris, which ranges across the eastern Atlantic, Mediterranean, and extends into the via temperate and subtropical zones up to 200 m depth. Deep-sea incirrates, including genera like Muusoctopus and Velodona, appear in all oceans but with regional specializations, such as high abundances in the southwestern . Explorations continue to expand known ranges; for example, a 2016 NOAA expedition documented an incirrate octopod (potentially a new ) at 4,290 m near the . More recently, as of 2023–2024, expeditions off identified at least four new deep-sea incirrate octopus on seamounts at depths around 3,000 m, while in 2025, large colonies of a Muusoctopus were observed at approximately 3,000 m off . These findings underscore the suborder's adaptability across depth gradients, though gaps persist in under-sampled regions like the deep sea.

Ecological Niches

Incirrate octopods predominantly occupy benthic niches, utilizing crevices in rocky substrates, beds, and reefs for predation on mobile prey. Species such as Octopus vulgaris thrive in these shallow coastal environments, where structural complexity provides shelter and facilitates hunting strategies. In deeper waters, burrowing forms like those in the genus Graneledone inhabit soft flats on continental slopes, excavating dens to evade predators and conserve energy in low-oxygen conditions. Certain incirrate lineages have adapted to pelagic niches, particularly gelatinous forms in the family Bolitaenidae, which drift in midwater columns over deeper waters to minimize encounters with surface predators. These small, transparent octopods, such as Bolitaena pygmaea, maintain through reduced musculature and high water content, allowing passive suspension at depths of 300–1000 m in tropical and temperate oceans. Deep-sea incirrate species exhibit adaptations for extreme pressure, including lipid-rich tissues in the digestive gland that enhance and reduce density without reliance on gas-filled structures. Incirrata tolerate a broad temperature spectrum, from -1.8°C in benthic zones to 30°C in tropical reefs, with Antarctic species such as Pareledone charcoti showing metabolic adjustments to perpetual cold. As mid-level predators, incirrata consume crustaceans, mollusks, and small fish, exerting top-down control on benthic and pelagic communities; for example, Octopus vulgaris preys heavily on crabs and bivalves, influencing shellfish populations. They serve as prey for higher trophic levels, including , seals, and seabirds, linking primary consumers to apex predators in marine food webs. In biodiversity hotspots like the shelf, incirrate octopods comprise over 50% of cephalopod species (27 of 54 known as of 2019), acting as keystone scavengers that accelerate through rapid of carrion. Human activities pose significant threats to incirrate populations, with causing significant reductions in stocks of commercially harvested like Octopus vulgaris in some regions, disrupting local ecosystems. Habitat loss from further endangers shallow-water taxa, as degraded reefs diminish shelter and prey availability for ambush predators in tropical hotspots.

Biology

Behavior

Incirrate octopuses, such as those in the family , exhibit a predominantly solitary lifestyle, often maintaining individual territories centered around dens in benthic habitats. These animals defend their shelters aggressively against intruders, using arm-waving displays and postural signals to communicate territorial boundaries and deter rivals. While typically asocial, some demonstrate limited social tolerance, sharing dens or tanks without frequent under certain conditions. Hunting strategies among incirrate octopuses vary by species and prey type but commonly involve tactics from concealed positions, where the octopus waits motionless before striking with rapid arm extensions. Active pursuit is employed against mobile prey like , with es favoring low-velocity stalking followed by a sudden lunge, while crabs may prompt faster approaches using preferred arms for capture. These behaviors leverage the 's flexible body for precise, opportunistic predation in diverse environments. Locomotion in incirrate octopuses relies on a combination of crawling using their arms, which allows for stealthy movement over substrates, and achieved through rhythmic mantle contractions that expel water via the for bursts of speed. Crawling predominates in and exploration, enabling complex maneuvers like bipedal walking in species such as , while jetting serves primarily for escape, reaching speeds up to 70 cm/s but at high energetic cost. Pelagic gliding occurs in some incirrate families during dispersal, though it is less common than in cirrates. Camouflage is a hallmark defensive , facilitated by thousands of chromatophores—pigment-containing cells in the skin that expand or contract under neural control to produce rapid color and pattern changes for blending with surroundings. Ink ejection from the creates a smokescreen to confuse predators during flight, while , the voluntary detachment of arms, serves as a distraction mechanism, allowing escape despite the temporary loss of limbs that can later regenerate. Incirrate octopuses display remarkable , evidenced by tool use in like the veined octopus (), which collects and transports coconut shells or seashells to assemble portable shelters, a behavior observed in both defensive and contexts. Laboratory studies reveal puzzle-solving abilities, such as navigating mazes for rewards, alongside short- and formation, supported by a distributed that enables associative learning. Social interactions are rare and typically agonistic, involving displays like arm spreading or color changes to resolve conflicts over resources, with individual recognition allowing octopuses to remember and respond differently to familiar conspecifics. Mating-related dances and postures occur briefly but do not lead to complex societies, distinguishing incirrates from more gregarious cephalopods like . Daily activity rhythms in shallow-water incirrate species, such as Octopus vulgaris, follow a nocturnal under 12:12 light-dark cycles, with peak locomotion, , and during nighttime to minimize predation risk from diurnal visual hunters. Deep-sea incirrates exhibit more continuous activity due to perpetual darkness, though rest periods marked by reduced movement and skin patterning changes occur rhythmically.

Reproduction and Life Cycle

Incirrate octopuses reproduce sexually through , where males use a specialized called the to transfer spermatophores—packets of —directly into the female's mantle cavity or oviducts. This process often involves physical mounting or reaching postures, with skin-to-skin contact facilitating the transfer. is pronounced in certain families, such as Tremoctopodidae (blanket octopuses), where males are extremely small—reaching only about 2-3 cm in mantle length compared to females exceeding 1 m—while retaining functional hectocotyli for reproduction. Mating behaviors in Incirrata typically include male guarding of receptive females to prevent interference from rivals, as observed in species like Abdopus aculeatus, where males copulate repeatedly over extended periods. Copulation can last from minutes to hours, involving close physical contact, and many species exhibit terminal spawning, with males often dying shortly after mating due to exhaustion or physiological decline. Females may mate with multiple partners, leading to potential sperm competition and multipaternity in broods. Following fertilization, females lay eggs in clusters attached to hard substrates, such as rocks, shells, or dens, and exhibit semelparity by brooding them continuously without feeding until , which ultimately leads to maternal and . Egg sizes vary from 1-45 mm, with brooding durations ranging from weeks in warmer waters to over a year in cold like Pareledone charcoti. is high, with like Octopus vulgaris producing up to 200,000 eggs per , though survival rates remain low due to predation and environmental factors. Development in most Incirrata is direct, lacking a free-living larval stage; embryos develop within protective chorions, hatching as miniature adults (benthic juveniles) that resemble scaled-down versions of their parents. This lecithotrophic mode relies on reserves for initial growth, enabling immediate upon . However, pelagic species such as (Argonauta spp.) feature a brief paralarval stage, where hatchlings drift in the before settling. The life cycle of Incirrata encompasses stages from embryonic development through , juvenile, subadult, , and senescent phases, characterized by rapid juvenile growth and maturation typically at 50-70% of maximum size. Lifespans vary widely by and , from as short as 6 months in small tropical forms like the day octopus (Octopus cyanea) to 4-5 years in larger or cold-water such as Antarctic Muusoctopus setebos. Overall, the semelparous strategy emphasizes a single, energy-intensive reproductive event, balancing high against short lifespans.

Evolution

Phylogenetic Relationships

Incirrata forms a monophyletic within the order Octopoda, serving as the to Cirrata, with both suborders united under the subclass Octopodiformes alongside Vampyromorpha. This positioning reflects the broader coleoid radiation, where Octopodiformes diverged from around 200 million years ago. Molecular phylogenies consistently support the of Incirrata, characterized by the absence of fins and cirri—key synapomorphies distinguishing it from the finned, cirrate Cirrata—alongside an advanced evolved from coleoid ancestors, featuring a highly centralized with elaborated optic and vertical lobes. These traits underscore adaptations for active predation and complex behaviors in benthic and pelagic environments. Molecular evidence from subunit I (COI) and other genes has been pivotal in confirming Incirrata's and its from Cirrata during the period, approximately 150–200 million years ago. Early analyses using partial COI sequences from 28 octopod species demonstrated strong support for Incirrata as a cohesive group, with bootstrap values exceeding 90% in parsimony and maximum-likelihood trees, challenging prior morphological doubts about family-level groupings within it. Complementary multi-gene data, combined with mitochondrial markers like 12S and 16S rDNA, further reinforced this split in multi-gene Bayesian frameworks, estimating the at around 136 million years ago (95% : 92–208 Ma), calibrated against fossil constraints such as the Paleoctopus. A landmark multigene study incorporating ten nuclear and mitochondrial loci (six nuclear and four mitochondrial) across 188 taxa upheld these findings, with posterior probabilities of 1.0 for Incirrata and the Incirrata-Cirrata node. Internally, Incirrata divides into two superfamilies: the basal, predominantly benthic Octopodoidea and the derived, pelagic Argonautoidea, the latter encompassing families like Argonautidae and Tremoctopodidae adapted to open-ocean lifestyles. Recent mitogenomic analyses confirm Argonautoidea as a monophyletic nested within Incirrata, emerging from benthic ancestors through shifts. Debates persist regarding the placement of certain families, such as Bolitaenidae, which some phylogenies position as basal to other Argonautoidea while others suggest closer ties to deep-sea radiations; these uncertainties arise from limited sampling and conflicting morphological signals like arrangements. Additionally, deep-sea Incirrata lineages, including genera in , exhibit diversification pulses following the Cretaceous-Paleogene (K-Pg) boundary, linked to post-extinction recovery and expanded abyssal niches around 66 million years ago.

Fossil Record

The fossil record of Incirrata is notably sparse, primarily due to the soft-bodied nature of these cephalopods, which decalcified and rarely preserve as complete specimens; most evidence comes from exceptional lagerstätten preserving arm impressions, suckers, beaks, or rare soft tissues like ink sacs. The earliest recognized incirrate octopod is Proteroctopus ribeti, from the ( stage) of La Voulte-sur-Rhône, , dating to approximately 165 million years ago, featuring well-preserved arms with suckers and an axial nerve cord, indicating primitive octopod morphology. This find marks the first appearance of unambiguous Incirrata in the record, with no earlier confirmed octopod fossils. Mesozoic diversity expanded during the , coinciding with the decline of ammonites and increased coleoid radiation. The family Keuppiidae, represented by species like Keuppia levante and Keuppia hyperbolaris from the Upper (~95 million years ago) of Hâqel and Hâdjoula, , provides key evidence of early incirrate , with exceptional preservation including ink sacs, gills, and a reduced vestige. These fossils, among the best-preserved octopod soft bodies, highlight adaptations toward modern incirrate forms, such as eight-armed bodies without fins. Additional taxa, including Styletoctopus annae and Palaeoctopus newboldi (Upper , ~95 million years ago, ), further document this period's limited but morphologically diverse incirrate assemblage. The Cenozoic era saw a post-Cretaceous-Paleogene extinction boom in incirrate diversity, though direct soft-tissue fossils remained elusive until recently. The first confirmed Paleogene incirrate octopod, an unnamed octopodid with preserved soft-tissue imprints including mantle and arms, was described from the Lower Eocene (~50 million years ago) of Bolca, northeastern Italy, representing a significant gap-filler in the record. By the Miocene (~23-5 million years ago), fossils indicate the emergence of modern families such as Octopodidae, with increased speciation linked to niche expansion, including deeper-water habitats during the Neogene. Overall, only about 20-25 valid fossil species of Incirrata are known, contrasting sharply with over 300 extant species, underscoring the preservational biases and evolutionary trends toward greater ecological versatility.

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