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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.
NB: As this Fossil is natural it will include markings, inclusions or other patterning.
Measurements are approximates.