Nautiloceras

Nautiloceras is an extinct genus from the nautiloid order Nautilida,[1] which includes the living Nautilus and its close relative Allonautilus.

Nautiloceras
Temporal range: Upper Tournaisian
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Nautiloidea
Order:
Nautilida
Genus:
Nautiloceras

D'Orbigny, 1849

Nautiloceras is a poorly known genus that probably belongs to the Trigonoceratidae. According to Kummel (1964)[2] Nautiloceras is a jr synonym for Trigonoceras which was named by M'Coy in 1948. Different ages are given for the two however,[3] with Nautiloceras being from the Upper Tournesian, about 352-345 Ma, (Lower Osage) and Trigonoceras somewhat younger, Upper Visean - Lower Serpukhovian, (Upper Meremec - Chester) with the span from about 340 to 322 Ma.

Nautiloceras [2] may have been cyrtconic to loosely gyroconic, coiled without whorls being in contact with one another. Gyroconic forms may have had a subtriangular cross section with a broad concave venter, occupying the outer rim.

References
  1. Paleobiology Database Nautiloceras entry
  2. Kummel (1964). R.C. Moore (ed.). Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.
  3. Sepkoski, J.J. Jr. 2002. A compendium of fossil marine animal genera. D.J. Jablonski & M.L. Foote (eds.). Bulletins of American Paleontology 363: 1–560. Sepkoski's Online Genus Database (CEPHALOPODA)


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