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Orthoceras ("straight horn") is a genus of extinct nautiloid cephalopod. This genus is sometimes called Orthoceratites. Note it is sometimes misspelled as Orthocera, Orthocerus or Orthoceros.

Orthoceras fossils are common and have a global distribution, occurring in any marine rock, especially in limestone.

These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae. Many other very similar species are included under the genus Michelinoceras.

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Wikipedia has a more detailed and comprehensive article on Orthoceras



Jurassic Park Inspired Games

Jurassic Park: Builder

Orthoceras can be created in the Aquatic Park of Jurassic Park: Builder. Though it requires dino-dollars purchase.