Amphissa undata

Amphissa undata
	Shell of Amphissa undata (specimen at the Natural History Museum, Rotterdam)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Columbellidae
Genus:	Amphissa
Species:	A. undata
Binomial name
	Amphissa undata; (P. P. Carpenter, 1864)
Synonyms
	† Amphissa ventricosa Arnold, 1903; Amycla undata P. P. Carpenter, 1864 superseded combination;

Amphissa undata is a species of sea snail, a marine gastropod mollusc in the family Columbellidae, the dove snails.^[1]

Description

(Original description in Latin) The shell is small, reddish-brown, and turreted, covered with a thin epidermis. Its spire margins are nearly straight. The four nuclear whorls are smooth and swollen, forming a mammillated apex. The five normal whorls are very swollen, with impressed sutures. Nine very swollen, broad radial ribs are present, becoming obsolescent anteriorly and posteriorly, with wavy interspaces. The spiral lirae are more acute and distant, surpassing the ribs, and elegantly undulate along the interspaces; six to eight of these are shown on the spire. The aperture is oval, extended into a short, straight siphonal canal, and is not lirate within. The outer lip is acute, joined to an acute, projecting labium at the suture. The columella is flattened. The operculum is nassoid. ^[2]

Distribution

This species is occurs from Monterey Bay, California, to Asunción Island, Baja California.

References

^ Amphissa undata (P. P. Carpenter, 1864). 20 May 2025. Retrieved through: World Register of Marine Species.
^ Carpenter, P.¨P. (1864). "Descriptions of new marine shells from the coast of California. Part I". Proceedings of the California Academy of Sciences. 3: 159. Retrieved 20 May 2025. This article incorporates text from this source, which is in the public domain.

External links

Arnold, R. (1903). "The paleontology and stratigraphy of the marine Pliocene and Pleistocene of San Pedro, California". Memoirs of the California Academy of Sciences. 3: 242.
McLean, J.H. (1996). "The Prosobranchia. In: Blake, J.A., & P.H. Scott (eds.), Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel. The Mollusca Part 2 – The Gastropoda". Anta Barbara Museum of Natural History. 9.
de Maintenon, M.J. (2019). "The columbellid species of the northeast Pacific coast from the Aleutian Islands to Cedros Island, Baja California (Neogastropoda: Columbellidae)". Zoosymposia. 13: 168. doi:10.11646/zoosymposia.13.1.19.

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[WoRMS-1] Amphissa undata (P. P. Carpenter, 1864). 20 May 2025. Retrieved through: World Register of Marine Species.

[2] Carpenter, P.¨P. (1864). "Descriptions of new marine shells from the coast of California. Part I". Proceedings of the California Academy of Sciences. 3: 159. Retrieved 20 May 2025. This article incorporates text from this source, which is in the public domain.

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