Odostomia minutissima

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

Odostomia minutissima
Apertural view on a shell of Odostomia minutissima
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. minutissima
Binomial name
Odostomia minutissima
Dall & Bartsch, 1909
Synonyms[1]

Odostomia (Evalea) minutissima Dall & Bartsch, 1909

This species is considered a synonym of Odostomia raymondi Dall & Bartsch, 1909 by James X. Corgan (1973).[4] Dall & Bartsch based their distinction on the difference in length.[1]

Description

The very small, bluish-white shell is very regularly narrowly conic. The shell grows to a length of 3.1 mm. The whorls of the protoconch are deeply obliquely immersed in the first of the succeeding turns, above which only the tilted edge of the last volution projects. The whorls of the teleoconch are slightly rounded, feebly contracted at the sutures, and very narrowly shouldered at the summit. The spiral thread at the periphery and the narrow tabulated summits, which fall a little anterior to this, render the suture narrowly channeled. The periphery of the body whorl is marked by a slender raised thread. The base is short, well rounded and impressed at the umbilical area. The entire surface of the spire and base is marked by slightly protractive lines of growth and many very fine, closely spaced spiral striations. The aperture is rhomboidal. The posterior angle is obtuse. The outer lip is thin. The columella is slender, curved, slightly revolute and provided with a strong fold at its insertion.[1]

Distribution

This species occurs in the Pacific Ocean off California.

References
  1. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909
  2. WoRMS (2011). Odostomia minutissima Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575875 on 2011-11-10
  3. Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:
  4. James X. Corgan (1973), The Veliger vol. 15, pp. 359-360
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