Odostomia atossa

Odostomia atossa is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2]

Odostomia atossa
Apertural view of a shell of Odostomia atossa
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. atossa
Binomial name
Odostomia atossa
Dall, 1908
Synonyms
  • Evalea atossa Dall, 1908
  • Odostomia (Evalea) atossa Dall, 1908 (basionym)

Description

The large, ovate shell is bluish-white. Its length measures 6.5 mm. The whorls of the protoconch are small, deeply obliquely immersed in the first of the succeeding turns, above which only the tilted edge of the last volution projects. The five whorls of the teleoconch are inflated, well rounded and feebly contracted at the sutures. They are very weakly shouldered at the summit, marked by fine, slightly retractive lines of growth, and by 7 incised spiral lines on the first, 10 on the second, and 20 on the third. On the last whorl they are very feeble between the sutures, where they are replaced by four slender, spiral threads. The periphery of the body whorl is inflated. The base of the shell is inflated, well rounded and marked by numerous, closely spaced, fine spiral striations. The aperture is large, ovate. The postenor angle is acute. The outer lip is thin. The columella is moderately strong, strongly curved, decidedly reflected, partly reinforced by the base and provided with a fold at its insertion.[3]

Distribution

This species occurs in the Pacific Ocean off California.

References
  1. Rosenberg, G. (2011). Odostomia atossa Dall, 1908. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581102 on 2011-10-26
  2. 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). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.
  3. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909
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