Orthoceras annulatum, Print, Orthoceras ("straight horn") is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called Orthoceratites

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Orthoceras annulatum, Print, Orthoceras ("straight horn") is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called Orthoceratites.

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Photo credit: © Artokoloro / Alamy / Afripics
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Keywords: annulatum, baltic, cephalopod, extinct, genus, horn, limestones, marine, middle, nautiloid, ordovician-aged, orthoceras, orthoceratites, print, restricted, states, straight, sweden