Odostomia franciscana

Odostomia franciscana
	Drawing of a shell of Odostomia franciscana
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia; clade Euthyneura; clade Panpulmonata
Superfamily:	Pyramidelloidea
Family:	Pyramidellidae
Genus:	Odostomia
Species:	O. franciscana
Binomial name
	Odostomia franciscana; Bartsch, 1917
Synonyms[1]
	Evalea franciscana (Bartsch, 1917); Odostomia (Evalea) franciscana Bartsch, 1917;

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

Description

The thin, yellowish white shell has a broadly elongate conic shape. The whorls of the protoconch are small, deeply embedded in the first of the succeeding turns, above which the tilted edge of the last volution only projects. The whorls of the teleoconch are inflated, well rounded, and feebly shouldered at the summit. They are marked by almost vertical, very feeble, incremental lines and exceedingly fine, closely spaced, spiral striations. The suture is moderately constricted. The periphery of the body whorl is very feebly angulated. The base of the shell is short, inflated, well rounded, and with a very narrow umbilical chink. The aperture is large. The posterior angle is acute. The outer lip is thin. The inner lip is strongly curved, somewhat reflected and provided with a strong, oblique fold at its insertion. The parietal wall is glazed with a thin callus.[1]

Distribution

The type species was found in the Pacific Ocean off San Francisco Bay, California.

References

P. Bartsch (1917), Descriptions on new West American mollusks and notes on previously described forms, Proceedings of the United States National Museum, 52(2193): 637-681, 6 pls..
Rosenberg, G. (2011). Odostomia franciscana Bartsch, 1917. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581207 on 2011-11-10
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.

External links

To World Register of Marine Species

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[Bartsch-1] P. Bartsch (1917), Descriptions on new West American mollusks and notes on previously described forms, Proceedings of the United States National Museum, 52(2193): 637-681, 6 pls..

[WoRMS-2] Rosenberg, G. (2011). Odostomia franciscana Bartsch, 1917. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581207 on 2011-11-10

[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.