Odostomia sillana

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

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

Description

The short, yellowish white shell has a conic shape. (The whorls of the protoconch of the type specimen are eroded). Its length measures 5.6 mm. The 5½ whorls of the teleoconch are well rounded, slightly overhanging. The summits of the whorls are appressed. The whorls are marked by almost vertical lines of growth and numerous closely spaced, wavy, microscopic, spiral striations. The suture is well marked. The periphery of the body whorl is well rounded. The inflated base of the shell is rather short, narrowly umbilicated and marked like the spire. The aperture is broadly ovate, somewhat effuse anteriorly. The posterior angle is acute. The outer lip is thin, and strongly curved in the middle. The columella is slender, strongly curved and reflected anteriorly. It is provided with a weak fold near its insertion. The parietal wall is glazed by a thin callus.[3]

Distribution

This marine species occurs off Amaknak Island, Alaska.

References
  1. Rosenberg, G. (2011). Odostomia sillana Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581251 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. Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 222; 1909
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