Coleoidea

Belongs within: Ammonoidea.Contains: Neocoleoidea, Belemnitida, Xiphoteuthididae. The cephalopod clade Coleoidea includes all living cephalopods except the Nautilidae. The main character separating the coleoids from other cephalopods was the reduction and internalisation of the shell (phragmocone); modern coleoids are active hunters, their lack of an external shell giving them great motility. Basal fossil members of the… Continue reading Coleoidea

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Belemnitellidae

Belongs within: Belemnitida. The Belemnitellidae are Late Cretaceous belemnites with an anterior alveolus or pseudalveolus on the rostrum, opening through a ventral fissure. Belemnitellidae: reaching the end of the era Published 3 July 2018 Fossil cephalopods have featured on this site numerous times in the past. I’ve talked about nautiloids, I’ve talked about ammonoids. But… Continue reading Belemnitellidae

Octopoda

Belongs within: Neocoleoidea.Contains: Grimpoteuthididae, Opisthoteuthididae, Octopodidae. The Octopoda, octopuses, are a group of stout-bodied cephalopods with eight arms and no tentacles. A small internal shell is present in members of the suborder Cirrata which also have a pair of fins on the head and cilia-like cirri associated with the suckers on the arms; all three… Continue reading Octopoda

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Sepiida

Belongs within: Neocoleoidea. The Sepiida are a group of broad-bodied, often benthic cephalopods with the tentacles retractile into large pockets on the head. Sepiidae, cuttlefishes, have a well-developed, straight and laminate internal shell whereas the shell is absent in Sepiadariidae, bottletail squids. SepiidaMG-H11 | i. s.: CeratisepiaYVD98 |–Belosepia [Belosaepiidae]YVD98 |–SepiadariidaeMG-H11 | |–Sepioloidea d’Orbigny 1839P61 |… Continue reading Sepiida

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Octopus

Belongs within: Octopodidae. Octopus is a diverse genus of benthic octopuses with biserial suckers and a large crop. The genus may be divided between a number of morphologically distinct groups but its taxonomy remains uncertain owing to the unclear identity of the type species (O’Shea 1999). <==Octopus Lamarck 1798O99 [incl. Paroctopus Naef 1923P61] |–*O. vulgaris… Continue reading Octopus

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Teuthida

Belongs within: Neocoleoidea.Contains: Enoploteuthidae, Taoniinae, Loliginidae, Spirulida, Onychoteuthidae, Ommastrephidae, Histioteuthidae. The Teuthida, squids, are a group of elongate-bodied cephalopods with the shell reduced to an internal, feather- or rod-shaped, gladius, and with ten circum-oral appendages including two contractile tentacles. The Cranchiidae, glass squids, have the coelom modified into a large buoyancy chamber that allows the… Continue reading Teuthida

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Octopodidae

Belongs within: Octopoda.Contains: Benthoctopus, Octopus. The Octopodidae is a diverse group of benthic octopuses, including the majority of familiar octopus species. Suckers on the arms are biserial in Octopodinae and Bathypolypodinae but uniserial in the deep-sea Graneledoninae (O’Shea 1999). Characters (from O’Shea 1999): Body muscular to gelatinous; suckers uniserial or biserial; radula heterodont, occasionally homodont;… Continue reading Octopodidae

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Sepiolidae

Belongs within: Neocoleoidea. The Sepiolidae, bobtail squid, are a group of small (1–10 cm long) cephalopods with a broad body, round posterior mantle and ear-like fins. They bear a funnel locking-apparatus with a single depression (Young 1996). SepiolidaeMG-H11 | i. s.: Austrorossia australis (Berry 1918)MG-H11 |–HeteroteuthinaeYVD98 | |–Sepiolina nipponensis (Berry 1911)BRW98, MG-H11 | |–NectoteuthisBRW98 |… Continue reading Sepiolidae

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Categorised as Coleoidea