''Omphalotrochus'' is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

taxonomic Taxonomy is the practice and science of categorization or classification. A taxonomy (or taxonomical classification) is a scheme of classification, especially a hierarchical classification, in which things are organized into groups or types. ...

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

Paleozoic The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and ' ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

s. It is widely distributed in the upper

and has been an important index fossil.

Species

Species in the genus ''Omphalotrochus'' include: * ''O. alleni'' Yochelson, 1956 * ''O. antiquus'' d'Orbigny, 1842 * ''O. calaniculatus'' Trautschold, 1879 * ''O. cochisensis'' Yochelson, 1956 * ''O. hessensis'' Yochelson, 1956 * ''O. kalitvaensis'' Licharev, 1940 * ''O. kalmiussi'' Zernetskaya, 1967 * ''O. karakubensis'' Zernetskaya, 1967 * ''O. obtusispira'' Shumard, 1859 * ''O. spinosus'' Yochelson, 1956 * ''O. whitneyi'' Meek, 1864 * ''O. wolfcampensis'' Yochelson, 1956

References

Prehistoric gastropod genera {{paleo-gastropod-stub