Liroceras is a genus of nautiloid cephalopod. It is the type genus of the clydonautiliacean family, Liroceratidae, and is characterized by a rapidly expanding, subglobular, nautiliconic shell with a reniform whorl section, small umbilicus, essentially straight sutures, and a siphuncle with a variable but not marginal position.[1]

Liroceras
Temporal range: Mississippian (L Carb) - Permian
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Nautilida
Family: Liroceratidae
Genus: Liroceras
Teichert, 1940

Liroceras has a temporal range from the Mississippian to the Permian period, the longest of the Liroceratidae. It has been found in North America, Europe, China and the East Indies. A similar genus, Condraoceras, differs in having a circular cross section and shallow ventral and lateral lobes. Another, Bistrialites, also has a reniform whorl section but differs in having a large funnel-shaped umbilicus.[1]

References

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  1. ^ a b Bernhard Kummel, 1964. Nautiloidea-Nautilida; Treatise on Invertebrate Paleontology, Part K. Geol Soc of America and Univ of Kansas Press, R. C. Moore (ed) — Liroceratidae K444–K447.