Odostomia youngi

Odostomia youngi
	Drawing of a shell of Odostomia youngi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Family:	Pyramidellidae
Genus:	Odostomia
Species:	O. youngi
Binomial name
	Odostomia youngi; Dall & Bartsch, 1910
Synonyms
	Odostomia (Evalea) youngi Dall & Bartsch, 1910

Odostomia youngi is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.^[2]^[3]

This species was named for Mr. C. H. Young, of the Geological Survey, Ottawa.

Description

The milk-white shell has an elongate-conic shape. Its length measures 6.5 mm. It is umbilicated. The whorls of the protoconch are small, obliquely immersed in the first of the turns of the teleoconch, above which only the tilted edge of the last volution projects. The seven whorls of the teleoconch moderately rounded, with a narrow tabulatedly shouldered summit. They are marked by equally spaced, rather strong, spiral striations, of which about 32 occur between the summit and the periphery on the penultimate turn. The periphery and the base of the body whorl are inflated, and well rounded. They are marked with spiral sculpture equal in strength and disposition to that on the spire. The sutures are strongly impressed. In addition to the spiral sculpture, the whorls are marked with curved retractive lines of growth. The aperture is pear-shaped. The posterior angle is acute. The outer lip is thin. The inner lip is slender, curved, and somewhat revolute. It is provided with a strong oblique fold a little anterior to its insertion. The parietal wall is glazed with a thick callus.^[4]

Distribution

The type specimen was found in the Pacific Ocean off Vancouver Island, British Columbia.

References

^ Dall and Bartsch, Dep. Mines, Geol. Surv., Canada, 1910, pp. 16-17, pi. 2, fig. 1
^ Rosenberg, G. (2011). Odostomia youngi Dall & Bartsch, 1910. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581273 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.
^ Paul Bartsch (1912), Additions to the West American Pyramidellid Mollusk Fauna with Descriptions of New Species, Proc. U.S. National Museum 42, p. 277-278

External links

[1] Dall and Bartsch, Dep. Mines, Geol. Surv., Canada, 1910, pp. 16-17, pi. 2, fig. 1

[WoRMS-2] Rosenberg, G. (2011). Odostomia youngi Dall & Bartsch, 1910. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581273 on 2012-01-12

[3] 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.

[4] Paul Bartsch (1912), Additions to the West American Pyramidellid Mollusk Fauna with Descriptions of New Species, Proc. U.S. National Museum 42, p. 277-278

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