Neverita lewisii explained

Neverita lewisii (previously known as Polinices lewisii, Lunatia lewisii, Euspira lewisii), common name Lewis's moon snail, is a species of large operculated sea snail. It is a predatory marine gastropod in the family Naticidae, the moon snails.^[1] Traditionally, this species was assigned to either the genus Lunatia, the genus Polinices or the genus Euspira. Recently, it was assigned to the genus Neverita based on molecular data.^[2]

This is the largest species in the family.

Distribution

Neverita lewisii lives in the Eastern Pacific, from British Columbia to northern Baja California, Mexico.

Habitat

This snail is found intertidally and at depths of up to, usually ploughing through the substrate looking for prey.

Description

The shell of this species can grow to across, the largest of the moon snails. It has an extremely large foot, which when the snail is active, is extended up over the shell and mantle cavity. Part of the propodium contains a black-tipped siphon which leads water into the mantle cavity. The cephalic tentacles, located on its head, are usually visible above the propodium.

When the animal retracts its soft parts into the shell, a lot of water is expelled, thus it is possible to close the shell with its tight-fitting operculum.

Diet

Neverita lewisii feeds mainly on bivalve molluscs by drilling a hole in the shell with its radula and feeding on the organism's soft flesh.

Reproduction

Like other moon snails, this species lays its eggs in a "sand collar". The eggs may number in the thousands and hatch into microscopic larvae which feed on plankton until they undergo torsion and metamorphose into the adult stage.

Further reading

• Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). . IX, 526 + cd-rom pp.
• Hoehing, D. 2001. "Euspira lewisii" (On-line), Animal Diversity Web. Accessed December 1, 2008 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Euspira_lewisii.html
• Brusca, Richard C., and Brusca, Gary J. Invertebrates. 2nd. Sunderland, MA: Sinauer Associates, Inc., 2003.
• Nybakken, James W. Diversity of the Invertebrates. Dubuque, IA: Times Mirror Higher Education Group, Inc., 1996.
• Lamb, A. and Hanby, B. P. (2005). Marine Life of the Pacific Northwest: A Photographic Encyclopedia of Invertebrates, Seaweeds, and Selected Fishes. Maderia Park, B. C. Harbour Publishing.
• Torigoe K. & Inaba A. (2011) Revision on the classification of Recent Naticidae. Bulletin of the Nishinomiya Shell Museum 7: 133 + 15 pp., 4 pls

Notes and References

1. Bouchet, P. (2012). Lunatia lewisii (Gould, 1847). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=584785 on 2012-08-16
2. Huelsken, T., Tapken, D., Dahlmann, T., Wägele, H., Riginos, C., Hollmann, M. (2012). Systematics and phylogenetic species delimitation within Polinices s.l. (Caenogastropoda: Naticidae) based on molecular data and shell morphology. Organisms Diversity & Evolution. .