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Ammonoidea 3D Model
An ammonite, subclass of the class Cephalopoda. This particular specimen comes from the teaching collection of the Department of Invertebrate Paleontology.
Cephalopods are extant (living), marine mollusks characterized by tentacles attached to a cone-shaped body. The name cephalopod comes directly from the Greek kephalopoda, “head-feet.” Most fossil cephalopods formed a calcareous (made of calcium carbonate) shell around their conical body. The conical shell may be straight (orthoconic), curved (cyrtoconic), or coiled. As cephalopods grow, shells are sealed off into increasingly large chambers, with the body remaining connected by soft tissue in a thin tube called the siphuncle. Many cephalopods exist today – cuttlefish, squid, and octopus - but only the Nautilus maintains a coiled shell. (David and Mapes 1996, “Phylum Mollusca, Class Cephalopoda”)
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