Turbonilla hypolispa

Turbonilla hypolispa
Drawing of a shell of Turbonilla hypolispa
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Family:	Pyramidellidae
Genus:	Turbonilla
Species:	T. hypolispa
Binomial name
Turbonilla hypolispa Dall & Bartsch, 1909 [1]
Synonyms
Turbonilla (Chemnitzia) hypolispa Dall & Bartsch, 1909

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

Description

The broadly conic shell is yellowish-white. The 2½ whorls of the protoconch are very small. They form a rather elevated helicoid spire. Its axis is at right angles to that of the succeeding turns, in the first of which it is a little more than half immersed. The 11 whorls of the teleoconch are well rounded, and slightly shouldered at the summit. They are marked by very strong, sublamellar, protractive axial ribs, of which 14 occur upon the second and third, 16 upon the fourth to eighth, 18 upon the ninth and tenth, 20 upon the eleventh, 24 upon the twelfth, and 25 upon the penultimate turn. On the early whorls these ribs are very strong in the middle, bending suddenly toward the summit, which gives them a decidedly angulated appearance a little below their termination. On the last three whorls they are more closely crowded and less strongly developed. The intercostal spaces are about one and one-half times as wide as the ribs on the early whorls. On the last three they are about equal to them, well impressed, and terminating a little above the sutures. The sutures are well marked. The periphery of the body whorl is slightly angulated. The base of the shell is short, and well rounded. The aperture is rhomboidal. The columella is slender, somewhat curved, and slightly reflected. ^[1]

Distribution

The type species was found in the Pacific Ocean off San Diego, California.

References

1. Dall & Bartsch (1909), A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p.34
2. Rosenberg, G. (2011). Turbonilla hypolispa Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581338 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.

External links

• To World Register of Marine Species