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Phragmoteuthida
Phragmoteuthida is an order of coleoid cephalopods〔Doguzhaeva, L. 2002. ''Abhandlungen der Geologischen Bundesanstalt'' 57: 9–55.〕 characterized by a fan-like teuthoid pro-ostracum attached to a belemnoid-like phragmocone.
==Diagnosis==
Jeletzky〔 characerized phragmoteuthids as having a large tripartite, fanlike pro-ostracum forming the longest portion of the shell, attached to about three-quarters of the circumference of a comparatively small breviconic phragmocone with short camerae and superficially belemnitid-like siphuncle, an absent or much reduced rostrum at the apical part of the phragmocone, belemnite-like arm hooks, an ink sack, beaks resembling those of Recent teuthids, and a muscular mantle.
Donovan(2006), gives a similar description for ''Phragmoteuthis'' from the Jurassic of Dorset, England. Notes phragmocones as having an apical angle of between 20 and 30 degrees, and relatively few chambers compared with belemnoids; a multi-layered conotheca, thick-walled siphuncle, and a long, three-lobed pro-ostracum as in the Triassic species. Arms are short and bear pairs of slightly curved hooks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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