The elongate-ovate shell is vitreous. Its length measures 3.5 mm. The whorls of the protoconch are small, obliquely immersed in the first of the succeeding turns, above which projects the tilted edge which is marked with five raised spiral lirations. The five whorls of the teleoconch are somewhat inflated, well rounded, moderately contracted at the sutures, strongly slopingly shouldered at the summit. They are ornamented with somewhat retractive axial ribs, of which 14 occur upon the first, 16 upon the second, 18 upon the third, and 20 upon the penultimate turn. In addition to the axial ribs, the whorls are marked by four spiral cords between the sutures which are as strong as the ribs and render them strongly nodulous at their junction. The second of these ribs below the summit marks the angle of the shoulder. The spaces enclosed by the ribs and cords are strongly impressed oblong pits, the long axis of which coincides with the spiral sculpture. The sutures are strongly constricted. The periphery of the body whorl is marked by a spiral groove, crossed by the continuations of the axial ribs, which terminate at the posterior edge of the first basal keel. The base of the shell is well rounded posteriorly, somewhat attenuated anteriorly. It is marked by six almost equal spiral keels, which are less developed about the umbilical area. The deep grooves between these keels are crossed by numerous very slender, raised axial threads. The aperture is oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The shell is rendered decidedly sinuous by the spiral cords. The columella is moderately strong, decidedly reflected anteriorly. It is provided with a fold at its insertion.[1]
^ abDall, William Healey; Bartsch, Paul (1909). "A monograph of West American pyramidellid mollusks". Bulletin of the United States National Museum (68): i–258. doi:10.5479/si.03629236.68.i. hdl:2027/nyp.33433004094292.
January 01, 1970
odostomia, oldroydi, 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 oldroydi is a species of sea snail a marine gastropod mollusc in the family Pyramidellidae the pyrams and their allies Odostomia oldroydi Apertural view of the shell of Odostomia oldroydi Scientific classification Domain Eukaryota Kingdom Animalia Phylum Mollusca Class Gastropoda Subclass Heterobranchia Family Pyramidellidae Genus Odostomia Species O oldroydi Binomial name Odostomia oldroydiDall amp Bartsch 1909 Synonyms Odostomia Chrysallida oldroydi Dall amp Bartsch 1909 The epithet oldroydi refers to Ida Shepard Oldroyd Mrs T S Oldroyd 1 151 Description editThe elongate ovate shell is vitreous Its length measures 3 5 mm The whorls of the protoconch are small obliquely immersed in the first of the succeeding turns above which projects the tilted edge which is marked with five raised spiral lirations The five whorls of the teleoconch are somewhat inflated well rounded moderately contracted at the sutures strongly slopingly shouldered at the summit They are ornamented with somewhat retractive axial ribs of which 14 occur upon the first 16 upon the second 18 upon the third and 20 upon the penultimate turn In addition to the axial ribs the whorls are marked by four spiral cords between the sutures which are as strong as the ribs and render them strongly nodulous at their junction The second of these ribs below the summit marks the angle of the shoulder The spaces enclosed by the ribs and cords are strongly impressed oblong pits the long axis of which coincides with the spiral sculpture The sutures are strongly constricted The periphery of the body whorl is marked by a spiral groove crossed by the continuations of the axial ribs which terminate at the posterior edge of the first basal keel The base of the shell is well rounded posteriorly somewhat attenuated anteriorly It is marked by six almost equal spiral keels which are less developed about the umbilical area The deep grooves between these keels are crossed by numerous very slender raised axial threads The aperture is oval The posterior angle is obtuse The outer lip is thin showing the external sculpture within The shell is rendered decidedly sinuous by the spiral cords The columella is moderately strong decidedly reflected anteriorly It is provided with a fold at its insertion 1 Distribution editThis species occurs in the Pacific Ocean off California References edit a b Dall William Healey Bartsch Paul 1909 A monograph of West American pyramidellid mollusks Bulletin of the United States National Museum 68 i 258 doi 10 5479 si 03629236 68 i hdl 2027 nyp 33433004094292 Retrieved from https en wikipedia org w index php title Odostomia oldroydi amp oldid 1028538879, wikipedia, wiki, book, books, library,
