The small, milk-white shell is pupiform and generally cancellated. It measures 3.2 mm. The whorls of the protoconch number at least two, forming a depressed helicoid spire, whose axis is at right angles to that of the succeeding turns, in the first of which it is all but one-half immersed. The seven whorls of the teleoconch are flattened, strongly contracted at the suture and decidedly shouldered at the summit. They are marked by strong vertical axial ribs of which there are 16 upon the first and second, 18 upon the third to fifth, and 20 upon the penultimate turn. In addition to the ribs the whorls are marked by four spiral cords about one-half as strong as the ribs, between the sutures: the first of these is at the angle of the shoulder. The junction of the spiral cords and ribs are nodulous. The spaces enclosed between them are rectangular pits. The sutures are channeled. The periphery of the last whorl is marked by a spiral cord at whose posterior margin the axial ribs terminate. The base produced is moderately rounded, marked by ten spiral cords, which, like the grooves separating them, decrease regularly in size from the periphery to the umbilical area. The grooves on the base are crossed by numerous slender axial threads. The aperture is pyriform, somewhat effuse anteriorly. It is channeled at the posterior angle, which is obtuse. The outer lip is thin, with a simple edge, decidedly arched in the middle, flattened on the side, showing the external sculpture within. The columella is stout, profoundly but distinctly plaited, reflected very much anteriorly. It is provided with a strong fold at its insertion. The parietal wall is covered with a thick callus.[4] The operculum is radiately corrugated.[5]
Distributionedit
This species occurs in the Pacific Ocean from Panama to Peru.
Referencesedit
^C. B. Adams, Ann. Lyc. Nat. Hist, of N. Y., vol. 5, 1852, p. 390.
^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
^G.W. Tryon, Manual of Conchology vol. VIII, p. 297, 1889
External linksedit
To World Register of Marine Species
January 01, 1970
odostomia, communis, species, snail, marine, gastropod, mollusc, family, pyramidellidae, pyrams, their, allies, apertural, view, shell, scientific, classification, domain, eukaryota, kingdom, animalia, phylum, mollusca, class, gastropoda, subclass, heterobranc. Odostomia communis is a species of sea snail a marine gastropod mollusc in the family Pyramidellidae the pyrams and their allies 2 3 Odostomia communis Apertural view of the shell of Odostomia communis Scientific classification Domain Eukaryota Kingdom Animalia Phylum Mollusca Class Gastropoda Subclass Heterobranchia Family Pyramidellidae Genus Odostomia Species O communis Binomial name Odostomia communis C B Adams 1852 1 Synonyms Chemnitzta communis C B Adams 1852 Chrysallida communis C B Adams 1852 Fusus borealis Philippi R A 1850 Contents 1 Description 2 Distribution 3 References 4 External linksDescription editThe small milk white shell is pupiform and generally cancellated It measures 3 2 mm The whorls of the protoconch number at least two forming a depressed helicoid spire whose axis is at right angles to that of the succeeding turns in the first of which it is all but one half immersed The seven whorls of the teleoconch are flattened strongly contracted at the suture and decidedly shouldered at the summit They are marked by strong vertical axial ribs of which there are 16 upon the first and second 18 upon the third to fifth and 20 upon the penultimate turn In addition to the ribs the whorls are marked by four spiral cords about one half as strong as the ribs between the sutures the first of these is at the angle of the shoulder The junction of the spiral cords and ribs are nodulous The spaces enclosed between them are rectangular pits The sutures are channeled The periphery of the last whorl is marked by a spiral cord at whose posterior margin the axial ribs terminate The base produced is moderately rounded marked by ten spiral cords which like the grooves separating them decrease regularly in size from the periphery to the umbilical area The grooves on the base are crossed by numerous slender axial threads The aperture is pyriform somewhat effuse anteriorly It is channeled at the posterior angle which is obtuse The outer lip is thin with a simple edge decidedly arched in the middle flattened on the side showing the external sculpture within The columella is stout profoundly but distinctly plaited reflected very much anteriorly It is provided with a strong fold at its insertion The parietal wall is covered with a thick callus 4 The operculum is radiately corrugated 5 Distribution editThis species occurs in the Pacific Ocean from Panama to Peru References edit C B Adams Ann Lyc Nat Hist of N Y vol 5 1852 p 390 WoRMS 2011 Odostomia communis C B Adams 1852 Accessed through World Register of Marine Species at http www marinespecies org aphia php p taxdetails amp id 575830 on 2011 10 26 Keen M 1971 Sea shells of Tropical West America Marine mollusks from Baja California to Peru 2nd edit Stanford University Press pp 1064 William Healy Dall and Paul Bartsch A Monograph of West American Pyramidellid Mollusks Smithsonian Institution 1909 G W Tryon Manual of Conchology vol VIII p 297 1889External links editTo World Register of Marine Species Retrieved from https en wikipedia org w index php title Odostomia communis amp oldid 1023505128, wikipedia, wiki, book, books, library,
