Rhynchorthoceras
Genus of nautiloids / From Wikipedia, the free encyclopedia
Rhynchorthoceras is a Middle Ordovician genus characterized by a rapidly expanded, weakly annulate orthocone, like the orthoconic section of Ancistroceras, but with only a curved, cyrtoconic apex instead of juvenile whorls.
Quick Facts Rhynchorthoceras Temporal range: MOrdovician, Scientific classification ...
Rhynchorthoceras Temporal range: MOrdovician | |
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Genus: | Rhynchorthoceras |
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Rhynchorthoceras is probably derived from Ancistroceras by a loss of the tarphycerid type apex, although it has been included with the orthocerid Sinoceratidae.