Cycloceras
| Cycloceras Temporal range: Ordovician-Permian | |
|---|---|
 | |
| Cranoceras depressum | |
Scientific classification  | |
| 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.[1]
Taxonomy
[edit]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 synonymous with Perigrammoceras.[citation needed]
Morphology
[edit]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
[edit]
- ↑ C. Teichert et al 1964. Treatise on Invertebrate Paleontology K(3)Nautiloidea:1-519
- ↑ PaleoBiology Database: Cycloceras, basic info
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