Odostomia columbiana explained

Odostomia columbiana is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.^{[1] [2]}

Description

The white shell is large and has an elongate-conic shape. Its length measures 8.3 mm. The whorls of the protoconch are small, vitreous, planorboid, deeply obliquely immersed in the first of the succeeding turns, above which only the tilted edge of the last volution is visible. The six whorls of the teleoconch are increasing regularly in size, well rounded, very narrowly roundly shouldered at the summits, which renders the sutures well marked. The periphery of the body whorl is somewhat inflated. The base of the shell is well rounded, attenuated anteriorly to reenforce the columella. The entire surface is covered by numerous somewhat wavy, subequal and subequally closely placed spiral lirations, of which about 40 occur between the summit and the periphery and about an equal number on the base of the last whorl. The aperture is large, decidedly patulous anteriorly. The posterior angle is acute. The outer lip is thin at the edge but very thick within. The columella is curved and strongly reflected, free only at its anterior extremity, and provided with a strong oblique fold at its insertion.^{[3] [4]}

Distribution

This species occurs in the Pacific Ocean off Vancouver Island, British Columbia, Canada.

References

• Rachel Collin and John B. Wise, Morphology and Development of Odostomia columbiana Dall and Bartsch (Pyramidellidae): Implications for the Evolution of Gastropod Development, Biol. Bull. 192: 243–252. (April, 1997) pdf

External links

• World Register of Marine Species
• Rachel Collin & John B. Wise (1996), Morphology and development of Odostomia columbiana Dall & Bartsch, 1909 (Pyramidellidae); Implications for the Evolution of gastropod Development, Biol. Bull. 192: 243-252. (April, 1997)

Notes and References

1. Rosenberg, G. (2011). Odostomia columbiana Dall & Bartsch, 1907. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581122 on 2011-10-26
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). . IX, 526 + cd-rom pp.
3. https://archive.org/stream/amonographwesta00bartgoog/amonographwesta00bartgoog_djvu.txt William Healy Dall and Paul Bartsch, "A Monograph of West American Pyramidellid Mollusks", Smithsonian Institution, 1909
4. https://www.biodiversitylibrary.org/item/32384#page/8/mode/1up Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 222; 1909 Plate 23 # 1