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About: Obinautilus     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Mollusk, within Data Space : dbpedia.org associated with source document(s)

Type: umbel-rc:Mollusk New Facet based on Instances of this Class

Obinautilus is an extinct genus of shelled cephalopod that has been variously identified as an argonautid octopod or a nautilid. It is known from the Late Oligocene to Pliocene of Japan. The shell is discoidal and very involute, with rapidly expanding and compressed whorls, fine radial ribs, a rounded venter with a shallow furrow, and almost closed umbilicus. Based on the examination of O. pulcher fossils from the Oligocene, the Tremoctopus–Argonauta divergence has been estimated to have occurred at least 29 million years ago.