Odostomia americana

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

Odostomia americana
Apertural view of the shell of Odostomia americana
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. americana
Binomial name
Odostomia americana
Dall & Bartsch, 1904
Synonyms

Odostomia (Evalina) americana Dall & Bartsch, 1904

Description

The milk-white shell is elongate-conic. Its length measures 2.9 mm. The whorls of the protoconch are quite large, at least two about three-fourths obliquely immersed. The five whorls of the teleoconch are rather broad between the sutures, well rounded, faintly shouldered at the summit, ornamented with depressed, rounded, rather broad axial ribs, about 19 of which occur upon the second, 20 on the third, and 18 upon the penultimate whorl. The ribs are best developed near the summits of the whorls and scarcely extend to the periphery. The spiral lirations are low, rounded, subequal, about 12 occur between the sutures upon the third and the penultimate whorls. These spiral lirations like the axial ribs appear strongest near the summits of the whorls. The periphery and the base of the body whorl are well rounded, the latter ornamented by about eleven lirations, which are similar in character to those between the sutures but much less strongly expressed. The aperture is rather broad, suboval, somewhat effuse anteriorly. The posterior angle is acute. The outer lip is thin. The columella is somewhat curved, strongly revolute anteriorly and having a weak oblique fold at its insertion.[3]

Distribution

This species occurs in the Pacific Ocean off California.

References
  1. Rosenberg, G. (2011). Odostomia americana Dall & Bartsch, 1904. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581093 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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