''Sinistrofulgur contrarium'' is a fossil

snail A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gastro ...

species of the

busycon ''Busycon'' is a genus of very large edible sea snails in the subfamily Busyconinae. These snails are commonly known in the United States as ''whelks'' or ''Busycon whelks''. Less commonly they are loosely, and somewhat misleadingly, called "conc ...

whelks in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Busyconidae The Busyconidae are taxonomic family of large sea snails, often known as whelks. MolluscaBase eds. (2022). MolluscaBase. Busyconidae Wade, 1917 (1867). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia. ...

. There has been some confusion about the correct taxonomy of this species, which has been confused with the extant species '' Sinistrofulgur sinistrum'' Hollister, 1958, and ''

Sinistrofulgur perversum ''Sinistrofulgur perversum'', the lightning whelk, is an edible species of very large predatory sea snail or whelk, a marine gastropod mollusc in the family Busyconidae, the busycon whelks. This species has a left-handed or sinistral shell. ...

'' (Linnaeus, 1758)J. Wise, M. G. Harasewych, R. T. Dillon Jr. (2004).
Population divergence in the sinistral whelks of North America, with special reference to the east Florida ecotone
(PDF; 673 kB)''. Marine Biology 145, pp. 1167–1179.

References

{{Taxonbar, from=Q884531 contrarium Gastropods described in 1840 Taxa named by Timothy Abbott Conrad