Odostomia farma

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

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

Description

The shell is elongate, ovate, and cream-colored. Its length measures 2.4 mm. The whorls of the protoconch number at least two, and are marked with three slender, spiral lirations, the apex being deeply obliquely immersed in the first of the succeeding turns. The junction of the nucleus and the post-nuclear whorls is marked by a varix. The five whorls of the teleoconch are well rounded. They are marked by three equal and subequally spaced spiral grooves which are crossed by slender axial riblets, the combination of grooves and ribs giving the whorls a pitted appearance. The four raised spaces bounded by the spiral grooves are finely spirally striated. The sutures are deeply channeled. The periphery of the body whorl is marked by a spiral groove. The base of the body whorl is well rounded. It is marked by four incised lines on the posterior two-thirds, which are equally spaced but grow successively weaker. The peripheral and first subperipheral channel are equal to those on the spire. All are rendered pitted by the slender axial riblets. The anterior third is smooth. The aperture is broadly oval, somewhat effuse anteriorly. The posterior angle is acute. The outer lip is thin. The columella is slender, curved, somewhat reflected and reinforced by the base. The parietal wall is covered by a thin callus. ^[3]

Distribution

This species occurs in the Pacific Ocean off Catalina Island, California.

References

1. Rosenberg, G. (2011). Odostomia farma Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581205 on 2011-11-10
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

• To World Register of Marine Species