Eulithidium cyclostoma

Eulithidium cyclostoma is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Phasianellidae, the pheasant snails.^[1][2]

Eulithidium cyclostoma
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Phasianellidae
Subfamily:	Tricoliinae
Genus:	Eulithidium
Species:	E. cyclostoma
Binomial name
Eulithidium cyclostoma (Carpenter, 1864)
Synonyms
Eucosmia cyclostoma Carpenter, 1864 Phasianella (Eucosmia) cyclostoma Carpenter, Pilsbry 1888 Tricolia cyclostoma (Carpenter, 1864)

Description

The height of the dark brownish shell reaches 2 mm. The broad, very obtuse shell consists of three whorls. These are rounded, and slightly shouldered. The shell is densely pointed or stained. The large umbilicus is subspiral. The aperture is large. The sutures are very impressed.^[3]

Distribution

The type locality is listed as "Cape St. Lucas, (Xantus)" (Cabo San Lucas, Baja California Sur, Mexico).