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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 limestones.
These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle
These orthocone cephalopods are conspicuous in the fossil record for their occasional but persistent appearances in monospecific assemblages dense enough to be rock-forming.
Greens and browns are most common.
Orthoceras grew to a length of 15 centimeters (6 inches) and fed upon small animals.