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Orthoceras
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Orthoceras

fossil mollusk genus
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Orthoceras was an ill-defined genus of extinct nautiloid cephalopod mollusks. These marine animals possessed a long, tapering shell that was nearly or quite straight and many-chambered. The term "orthoceratoid" is used to describe something that relates to or resembles Orthoceras. While not directly related to Orthoceras, other extinct marine cephalopods like Ceratites are significant as index fossils for the Middle Triassic Period.123

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4 Britannica Sources
  1. Orthoceras
  2. Ceratites
  3. orthoceratoid
  4. Protoceratops

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