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Acanthoteuthis
''Acanthoteuthis'' is a belemnite genus, a squid-like cephalopod with an internal shell from the Late Jurassic Epoch, related to modern coleoids.
''Acanthoteuthus'' belongs to the belemnoid family Belemnotheutidae in which the pointed rostrum at the back of the phragmocone is lacking.
==Taxonomy==
The genus ''Acanthoteuthis'' was founded by R. Wagner and G. Munster for belemnoids, found in the Solnhofen limestone of Bavaria, which have small hooklets on their arms, sometimes associated with more or less complete remains of the animal.〔G.C.Crick et al.On an Example of Acanthoteuthis ferussaci, Munst. from the Lithographic stone of Solenhofen, Bavaria,... Proceedings of the Malacological Socieity,Vol III Part 1,April,1898〕 The hooklets are typically compressed and may be beveled on either or both margins on one side.
Munster characterized three species, ''A. speciosa'', ''A. ferussacii'', and ''A. lichtensteinii'', chiefly upon the forms of these hooklets. In ''A lichtensteinii'' they are smaller than in ''A speciosa'' and more circular in transverse section. D'Orbigny united the three under the name ''A. ferussacii'' while Wagner regarded ''A. speciosa'' as a valid species but saw no essential difference between Munster's ''A. ferussacii'' and ''A. lichtensteinii'' so united the two under the name ''A. ferussacii''.〔
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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