Odostomia clementina

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

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

Description

The elongate-conic shell is vitreous. It measures 2.3 mm. The nuclear whorls are obliquely immersed in the first post-nuclear turn, above which only the tilted edge of the last volution projects, which is marked by five slender spiral threads. The five post-nuclear whorls are well rounded, moderately contracted at the sutures, strongly slopingly shouldered at the summit. They are marked by strong, somewhat retractive axial ribs, of which 14 occur upon the first and second, 18 upon the third and the penultimate turn. In addition to the axial ribs, the whorls are marked by four spiral cords between the sutures, of which the second one anterior to the summit marks the angle of the shoulder. On the last two whorls the first basal is apparent in the strongly contracted sutures. The periphery of the body whorl is marked by a spiral groove. The base of the shell is well rounded, somewhat attenuated anteriorly, and marked by five distant spiral cords which grow successively weaker from the periphery to the umbilical region. The broad spaces that separate these cords are marked by numerous fine, raised, axial threads. The aperture is broadly oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within, rendered sinuous by the spiral cords. The columella is moderately strong, slightly reflected, reinforced by the base, and provided with a slender fold at its insertion. ^[3]

Distribution

This species occurs in the Pacific Ocean off California.

References

1. Rosenberg, G. (2011). Odostomia clementina Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581120 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

External links

• To World Register of Marine Species