Odostomia fetella

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

Odostomia fetella
Apertural view of a shell of Odostomia fetella
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Odostomia
Species:
O. fetella
Binomial name
Odostomia fetella
Dall & Bartsch, 1909
Synonyms

Odostomia (Menestho) fetella Dall & Bartsch, 1909

Description

The very elongate-ovate shell is milk-white. Its length measures 4.4 mm. The whorls of the protoconch are small, obliquely two-thirds immersed in the first of the succeeding turns. The seven whorls of the teleoconch are well rounded, moderately contracted at the sutures and slightly shouldered at the summit. They are marked by four strong flattened cords which grow successively a little weaker from the summit to the periphery, separated by narrow, deeply incised spiral grooves. The periphery of the body whorl is marked by a broad, flat cord somewhat wider than the first supra-peripheral one. The base of the body whorl is somewhat attenuated anteriorly, well rounded, marked by eleven equal and equally narrow, rounded, spiral cords. In addition to this sculpture, there are many very fine incised spiral lines and decidedly retractive axial lines of growth on the spire and base. The aperture is broadly oval and slightly effuse anteriorly. The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The columella is moderately strong, slightly curved, somewhat reflected. It is completely reinforced by the base and provided with a strong fold at its insertion. The parietal wall is covered by a thin callus.[3]

Distribution

This species occurs in the Pacific Ocean from San Pedro, California, to San Ignacio Lagoon, Baja California Sur.

References
  1. Rosenberg, G. (2011). Odostomia fetella Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581206 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. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909
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