Cephalopoda
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| A cephalopod is any member of the molluscan class Cephalopoda. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot.
Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. About 800 living species of cephalopods have been identified. For more information visit the Wikipedia Entry Get back to Mollusca | |||
| Ammonites | Argonauts | Belemnites | Bobtail squids |
| Cuttlefishes | Michelinoceras | Nautiloids | Octopuses |
| Squids | Vampire squid | ||