Odostomia angularis

Odostomia angularis
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia clade Euthyneura clade Panpulmonata
Superfamily:	Pyramidelloidea
Family:	Pyramidellidae
Genus:	Odostomia
Species:	O. angularis
Binomial name
Odostomia angularis Dall & Bartsch, 1907
Synonyms
Evalea angularis Dall & Bartsch, 1907 Odostomia (Evalea) angularis Dall & Bartsch, 1907 (basionym)

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

Description

The very regularly elongate-conic shell is subdiaphanous to milk-white. It measures 5.6 mm. The nuclear whorls are small, deeply obliquely immersed in the first of the succeeding turns, above which the tilted edge of the last turn only is visible. The seven post-nuclear whorls are slightly rounded, and separated by constricted sutures. They are marked by numerous slender, wavy subequal and subequally closely spaced spiral striations, of which about 33 occur upon the last turn between the summit and the periphery. The periphery of the body whorl is marked by a slender raised keel, decidedly angulated. The base of the shell is short, moderately rounded. It is narrowly attenuated anteriorly to reinforce the columella, sculptured like the posterior portion of the whorls. The ovate aperture is very broad and slightly effuse anteriorly. The posterior angle is acute. The columella is very slender, evenly curved, closely appressed to the attenuated base, with a strong fold at its insertion, which is barely visible when the aperture is viewed squarely. ^[3]

Distribution

This species occurs in the Pacific Ocean off British Columbia, Canada.

References

1. ^ Rosenberg, G. (2011). Odostomia angularis Dall & Bartsch, 1907. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581099 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

External identifiers for Odostomia angularis
WoRMS	581099

• To World Register of Marine Species