Cymatoceras

Cymatoceras
Temporal range: U Jurassic - Oligocene [1][2]
Cymatoceras species from Albian of Madagascar
Scientific classification
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Superfamily: Nautilaceae
Family: Cymatoceratidae
Genus: Cymatoceras
Hyatt, 1884

Cymatoceras is a wide ranging extinct genus from the nautilitacean cephalopod family, Cymatoceratidae.

Selected species

[1]

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. [1]

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. [3]

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. [3]

References

  1. 1 2 3 Fossilworks
  2. Sepkoski, Jack Sepkoski's Online Genus Database – Cephalopodes
  3. 1 2 Bernhard Kummel, 1964. Nautiloidea - Nautilida. Treatise on Invertebrate Paleontology Part K. Geol Soc of America and Univ Kans Press, Teichert & Moore (eds)
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