- Cycloceras
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Cycloceras
Temporal range: Ordovician-PermianScientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Nautiloidea Order: Orthocerida Genus: Cycloceras
McCoy (1844)Cycloceras is an extinct nautiloid cephalopod genus from the Carboniferous of Western Europe, (Ireland and Scotland) of unknown affinity with the orthocerida (Sweet 1964 in) [1]
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);[2] Cycloceras is possibly a member of the Cycloceratidae and may be synomyous with Perigrammoceras Foerste
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 othocone with a narrow subcentral siphuncle. Annuli (circular transverse bands or costae) are thick and close spaced giving a corregated appearance.
References
- ^ C. Teichert et al 1964. Treatise on Invertebrate Paleontology K(3)Nautiloidea:1-519
- ^ PaleoBiology Database:Cycloceras,basic info
Categories:- Cephalopods
- Carboniferous animals
- Prehistoric animals of Europe
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