Rank Genus | ||
 | ||
Similar Nautilida, Cymatoceratidae, Eutrephoceras, Cenoceras, Nautiloid | ||
Cymatoceras is a wide ranging extinct genus from the nautilitacean cephalopod family, Cymatoceratidae.
Contents
Selected species
Fossil record
Fossils of Cymatoceras are found in marine strata from the Jurassic until the Oligocene (age range: from 155.7 to 28.4 million years ago.). Fossils are known from several localities in Europe, Japan, India, Antarctica, Greenland, North America, South America, Asia, Africa and Madagascar.
Description
Its shell is generally subglobular, variably involute with a rounded whorl section. Sides and venter bear conspicuous ribs. The suture is only slightly sinuous and the siphuncle position is variable.
Paracymatoceras, coeval during the Late Jurassic and Early Cretaceous differs primarily in having a more sinuous suture. Neocymatoceras tsukushiense from the Oligocene of Japan, described by Kobayashi, 1954, is a variant of Cymatoceras.