Atys costulosus

Atys costulosus
Drawing of a shell of Atys costulosus (holotype)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Cephalaspidea
Family:	Haminoeidae
Genus:	Atys
Species:	A. costulosus
Binomial name
Atys costulosus Pease, 1869
Synonyms
Atys costulosaPease, 1869 (incorrect gender of species epithet)

Atys costulosus is a species of small tropical sea snail, a bubble snail, a marine opisthobranch gastropod mollusk in the family Haminoeidae, the haminoea bubble snails. ^[1]

Description

The length of the shell attains 5½ mm, its diameter 2½ mm.

(Original description in Latin) The shell is elongate, subcylindrical, and narrowest posteriorly. It is white and umbilicate. The surface is longitudinally ribbed and is crossed at either end by elevated striae, which become more remote towards the middle of the shell and gradually vanish. The outer lip is posteriorly strongly twisted and produced. The columella is everted at the base, flattened, and appressed, while the aperture remains narrow. ^[2]

Distribution

This marine species occurs off Hawaii.

References

1. Atys costulosus Pease, 1869 . 6 January 2026. Retrieved through: World Register of Marine Species .
2. Pease, W.H. (1869). "Description of new species of marine Gasteropodæ inhabiting Polynesia". American Journal of Conchology. 5: 73. Retrieved 6 January 2026. This article incorporates text from this source, which is in the public domain .

• Bozzetti L. (2009) Atys bicolor (Gastropoda: Opisthobranchia: Haminoeidae) nuova specie dal Madagascar meridionale. Malacologia Mostra Mondiale 63: 17.