Turbonilla attrita

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Turbonilla attrita
Turbonilla attrita 001.png
Drawing of a shell of Turbonilla attrita
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Turbonilla
Species:
T. attrita
Binomial name
Turbonilla attrita
Dall & Bartsch, 1909 [1]
Synonyms

Turbonilla (Strioturbonilla) attrita Dall & Bartsch, 1909

Contents

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

Description

The bluish-white, slender shell has an elongate-conic shape. Its length measures 7.4 mm. The 2½ whorls of the protoconch are small and helicoid. Their axis is at right angles to that of the succeeding turns, in the first of which they are slightly immersed. The 12 whorls of the teleoconch are situated very high between the sutures and almost flattened. They are ornamented with very low, flattened, somewhat irregular, protractive axial ribs, which are best developed on the early whorls. Of these there are 18 upon the second whorl, 22 upon the third, 18 upon the fourth and fifth, 22 upon the sixth, 18 upon the seventh, 20 upon the eight and ninth. On the next turn they become quite enfeebled, and on the penultimate turn they are obsolete. The intercostal spaces are about half as wide as the ribs and very shallow. The sutures are well impressed. The periphery of the body whorl is well rounded. The base of the shell is short and somewhat inflated. The entire surface of the spire and the base is marked by numerous very fine, waxy spiral striations. The aperture is broadly oval. The posterior angle is acute. The outer lip is thin. The short columella is slender, somewhat curved and slightly reflected. [1]

Distribution

This species occurs in the Pacific Ocean off California.

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References

  1. 1 2 Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 46: 1909
  2. ↑ Rosenberg, G. (2011). Turbonilla attrita Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581303 on 2012-03-01
  3. ↑ 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). ISBN   1-888569-01-8. IX, 526 + cd-rom pp.
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