Odostomia lastra

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

Odostomia lastra
Apertural view of a shell of Odostomia lastra
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. lastra
Binomial name
Odostomia lastra
Dall & Bartsch, 1909
Synonyms
  • Aartsenia lastra (Dall & Bartsch, 1909)
  • Odostomia (Amaura) lastra Dall & Bartsch, 1909 (basionym)

Description

The thin, large shell has an elongate-ovate shape, tapering very regularly to an acute point. Its length measures 13.6 mm. The shell is narrowly umbilicated. The whorls of the protoconch are very small, deeply obliquely immersed in the first of the succeeding whorls, above which only the tilted edge of the last volution projects. The eight whorls of the teleoconch are well rounded, moderately constricted at the sutures and narrowly shouldered at the summit. They are marked by numerous slender wavy spiral striations and fine lines of growth which give the surface a somewhat malleated appearance. The periphery and the base of the body whorl are strongly rounded, the latter narrowly umbilicated, and marked like the spire. The aperture is large, broadly oval, slightly effuse anteriorly. The posterior angle is acute. The outer lip is thin. The columella is slender, very oblique, almost straight and somewhat reflected. The parietal wall is glazed with a thin callus.[3]

Distribution

This species occurs in the Pacific Ocean off Santa Catalina Island and San Diego, California.

References
  1. Rosenberg, G. (2011). Odostomia lastra Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581228 on 2011-11-10
  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. Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 219; 1909 Plate 28 #7
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