Odostomia clessini

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

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

According to ITIS, this species is a synonym of Odostomia tenuisculpta Carpenter, 1864.[3] Dall & Bartsch made their distinction on the following basis : O. tenuisculpta has the incised spiral lines strong on the early whorls and much finer on the later turns, while O. clessini has the incised spiral lines only moderately strong.

Description

The elongate-ovate, yellowish-white shell is rather thick. It measures 6.5 mm. The nuclear whorls are small, very obliquely immersed in the first of the succeeding turns, above which the edge about two-thirds of the last nuclear whorl project. The five or six post-nuclear whorls are very high between the sutures, moderately rounded, marked by lines of growth and fine, irregular and irregularly distributed incised spiral lines. The sutures are well impressed. The periphery and the base of the body whorl are well rounded, marked like the space between the sutures. The aperture is ear-shaped. The posterior angle is acute. The outer lip is rather thick within but thin at the edge. The columella is stout, curved, reflected, reinforced by the base and provided with a strong oblique fold at its insertion. The parietal wall is covered by a thin callus.[4]

Distribution

This species occurs in the Pacific Ocean off Alaska.

References
  1. Rosenberg, G. (2011). Odostomia clessini Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581121 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. ITIS: Odosotmia clessini
  4. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909
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