Cephalopoda

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(Biology)
m (Systematics: spelling of Coleoidea)
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'''Ammonoidea''' -- evolved forms with an external shell and prosiphonate siphuncle derived from the Nautilioidea. Biologically closely related to the dibranchiates. Became extinct at the end of the Cretaceous.
'''Ammonoidea''' -- evolved forms with an external shell and prosiphonate siphuncle derived from the Nautilioidea. Biologically closely related to the dibranchiates. Became extinct at the end of the Cretaceous.
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'''Coleodia''' -- shell-less forms and those with an internal vestigial shell represented by the dibranchiate squid, octopods, cuttlefish and spirula that live today. Includes the extinct belemnites.
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'''Coleoidea''' -- shell-less forms and those with an internal vestigial shell represented by the dibranchiate squid, octopods, cuttlefish and spirula that live today. Includes the extinct belemnites.
Older, anatomical (gill) based classification.
Older, anatomical (gill) based classification.

Revision as of 15:54, 13 December 2009

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