Odostomia dicella

Odostomia dicella
Apertural view of Odostomia dicella
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Family:	Pyramidellidae
Genus:	Odostomia
Species:	O. dicella
Binomial name
Odostomia dicella Bartsch, 1912
Synonyms
Odostomia (Chrysallida) dicella Bartsch, 1912

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

Description

The small shell measures 3 mm. It is elongate-ovate, somewhat translucent, bluish-white. The nuclear whorls are small, very obliquely immersed in the first of the succeeding turns. The five post-nuclear whorls are well rounded. They are marked by four spiral cords between the sutures, the three posterior of which are nodulose on the early whorls. The fourth, or suprasutural one being smooth. On the last whorl the nodules are obsolete. Of these cords, the one at the summit is the weakest and the second below it the strongest. The spaces between the spiral keels are about half as wide as the keels and rather shallow. In addition to the spiral sculpture the whorls are marked by slender, almost axial riblets, which render the three posterior keels on the early whorls nodulose at their intersections. Of these riblets, about 18 occur upon the second and 22 upon the third whorl. On the fourth, which is the penultimate, the grooves between the keels are crossed by slender axial threads. The sutures are strongly constricted. The periphery of the body whorl is marked by a narrow, deep sulcus. The base of the shell is moderately long, well rounded. It is marked by five spiral cords which grow successively weaker between the periphery and the umbilical area. The grooves between the sutural cords are equal, crossed by numerous, slender, axial threads, which cause the spaces between the threads and cords to appear as minute pits. The aperture is moderately large, somewhat effuse anteriorly;.The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The inner lip is moderately long, strong, somewhat curved, and reflected over and adnate to the base. It is provided with a slender fold at its insertion. The parietal wall is covered with a thin callus. ^[3]

Distribution

This species occurs in the Pacific Ocean off San Diego, California.

References

1. Rosenberg, G. (2011). Odostomia dicella Bartsch, 1912. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581127 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. Proceedings of the United States National Museum 42:286 Odostomia (Chrysallida) dicella

External links

• To World Register of Marine Species