Odostomia benthina
| Odostomia benthina | |
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| Apertural view of the shell of Odostomia benthina | |
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| Species: | O. benthina
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| Binomial name | |
| Odostomia benthina Dall & Bartsch, 1909
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Odostomia benthina is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2]
Description
The elongate-conic shell is white. It measures 4.8 mm. The whorls of the protoconch are small, deeply obliquely immersed in the first post-nuclear turn, above which only the tilted edge of the last volution projects. The six whorls of the teleoconch are well rounded, marked by slender, nodulous, retractive axial ribs, wliich terminate at the posterior extremity of the supra-peripheral cord, leaving this smooth. Of these ribs about 35 occur upon the first whorl, 28 upon the second and third, 22 upon the fourth, and 26 upon the penultimate turn. In addition to the axial ribs, the whorls are marked by five strong, spiral cords, the junction of which with the ribs form tubercles. The periphery of the body whorl is marked by a groove. The base of the shell is well rounded, ornamented with seven equal and equally spaced spiral cords, the grooves between which are marked by fine, raised axial threads. The aperture is pyriform, somewhat effuse anteriorly. The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The columella is slender, curved, and reflected, provided with an oblique fold at its insertion. The parietal wall is covered with a thin callus. [3]
Distribution
This species occurs in the Pacific Ocean off Mazatlan, Mexico
References
- ^ WoRMS (2011). Odostomia benthina Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575823 on 2011-10-26
- ^ Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:
- ^ William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909