home   Printer friendly version Add to site
Advanced search
Time & Space Fossil Gallery Famous Flora & Fauna
Careers Resources K-12 Collections PaleoPeople

Cephalopods

See More Images
(35 total)

Beloitoceras
Beloitoceras
© 2003 Milwaukee Public Museum

Orthoceras amplicameratum?
Orthoceras amplicameratum?
© 2003 Gary Andrashko, Illinois State Museum

Ammonite
Ammonite
© 2008 Royal Tyrrell Museum

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.

Cool Cephalopods links:

Search for images of Cephalopods on Google

help