Odostomia unalaskensis

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

Odostomia unalaskensis is a species of sea snail first described by William Healy Dall and Paul Bartsch in 1909. It is a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2]

Description

The light yellow shell has an elongate-ovate shape and is stout and strong. Its length measures 4.5 mm. (The whorls of the protoconch are decollated.) The 5 ¹⁄₂ whorls of the teleoconch are flattened on their outer three-fourths, rounding suddenly to the closely appressed summit, on the posterior fourth. The entire surface of the shell is marked by lines of growth and numerous equal and equally spaced, well marked spiral striations, of which about 28 occur between the sutures of the penultimate whorl. The sutures are well impressed. The periphery of the body whorl is somewhat angulated. The base of the shell is elongated, rounded, and marked like the spire. The aperture is ovate, and slightly effuse anteriorly. The posterior angle is acute. The outer lip is thin. The columella is short, strongly curved and reflected. It is reinforced for the greater part by the attenuated base and provided with a strong oblique fold at its insertion. The parietal wall is covered by a thin callus.[3]

Distribution

The type species was found off Unalaska, Alaska.

References

Rosenberg, G. (2011). Odostomia unalaskensis Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581266 on 2012-01-12
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.
Dall, William Healy & Bartsch, Paul (December 13, 1909). "A Monograph of West American Pyramidellid Mollusks". Bulletin of the United States National Museum. 68: 203.

External links

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[WoRMS-1] Rosenberg, G. (2011). Odostomia unalaskensis Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581266 on 2012-01-12

[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.

[Dall-3] Dall, William Healy & Bartsch, Paul (December 13, 1909). "A Monograph of West American Pyramidellid Mollusks". Bulletin of the United States National Museum. 68: 203.