Turbonilla dina
| Turbonilla dina | |
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| Drawing of a shell of Turbonilla dina | |
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| Species: | T. dina
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| Binomial name | |
| Turbonilla dina Dall & Bartsch, 1909 [1]
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Turbonilla (Pyrgiscus) dina Dall & Bartsch, 1909 | |
Turbonilla dina is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[2][3]
Description
The milk-white shell has an elongate-conic shape. Its length measures 5.2 mm. The 2½ whorls of the protoconch from a depressed, helicoid spire, the axis of which is at right angles to that of the succeeding turns, in the first of which it is about one-fifth immersed.The nine whorls of the teleoconch are slightly rounded on the anterior two-thirds between the sutures, the posterior third forming a strong sloping shoulder. They are marked by narrow, lamellar ribs, of which 18 occur upon the first, 16 upon the second to seventh, and 18 upon the eighth and penultimate turn. The intercostal spaces are about four times as wide as the ribs. They are marked by a double series of pits, one of which is at the periphery and the other at the angle of the shoulder. The space between the two pits is crossed by nine equal and equally spaced spiral striations. The space between the summit and the submedian pit is marked by twelve incised spiral lines of which those near the summit are finer and closer spaced than the rest. The sutures are strongly impressed. The periphery of the body whorl is slightly angulated. The base of the shell is short, and well rounded. It is marked by about twenty equal and almost equally spaced spiral striations. The aperture is rhomboidal. The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The columella is slender, almost straight and somewhat revolute. [1]
Distribution
The type specimen was found in the Pacific Ocean off Panama Bay, Panama.
References
- ^ a b Dall & Bartsch (1909), A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 96-97
- ^ WoRMS (2011). Turbonilla dina Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576005 on 2012-03-01
- ^ Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064