Orthoceras fossil. Orthoceras is a genus of extinct nautiloid cephalopod. Their fossils are common and have a global distribution. They are distinguished by slender,elongate shells with the middle of the body chamber transversely constricted,and a subcentral orthochoanitic siphuncle | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source |
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