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Exiteloceras jennyi
Exiteloceras jennyi
© 1998 Dr. Richard Paselk, Humboldt State University Natural History Museum

Shenodiscus lenticulares
Shenodiscus lenticulares
© 2005 The Virtual Fossil Museum

© 2006 Joe Koniecki

What are Cephalopods? Cephalopods, meaning “head foot,” have a foot that has been modified into flexible arms and a tube (siphon), as well as highly developed eyes and nervous systems. They can move backwards rapidly by expelling water through the siphon. Some members of this group, such as the living Nautilus and the extinct ammonites, have external shells. These shells are divided into chambers, and the cephalopod only lives in the last, largest chamber. Squid, cuttlefish, and extinct forms like belemnites, have internal shells, many of which are also chambered. Octopuses have no shells. Members of this group first appear in the Devonian, and some members are still around today.

First known fossil occurrence: Cambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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