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Cycloceras

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Extinct genus of nautiloids

Cycloceras
Temporal range: Ordovician-Permian
Cranoceras depressum
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: †Orthocerida
Genus: †Cycloceras
M'Coy, 1844

Cycloceras is an extinct nautiloid cephalopod genus from the Carboniferous of Western Europe, (Ireland and Scotland) of unknown affinity with the Orthocerida.

Taxonomy

Cycloceras was named by McCoy (1844 and assigned to the Michelinoceratida by Flower (1962)and to the Orthocerida by Sweet in Teichert et al. (1964); Cycloceras is possibly a member of the Cycloceratidae and may be synonymous with Perigrammoceras.

Morphology

The type species of Cycloceras, C. annularis, is based in an internal mold of a body chamber on which the position of the siphuncle is indiscernible (Sweet 1964,) Species referred to Cycloceras are annulated, subcylindrical orthocones with no longitudinal ornamentation . Fig 186, p K258 Teichert et al. (1964) shows Cycloceras as narrow, gently expanding, annulated orthocone with a narrow subcentral siphuncle. Annuli (circular transverse bands or costae) are thick and close spaced, giving a corrugated appearance.

References

  1. C. Teichert et al 1964. Treatise on Invertebrate Paleontology K(3)Nautiloidea:1-519
  2. PaleoBiology Database:Cycloceras,basic info
Taxon identifiers
Cycloceras


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