Turbonilla imperialis

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

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

Turbonilla (Strioturbonilla) imperialis Dall & Bartsch, 1909

Description

The shell has an elongate-conic shape. Its length measures 3.3 mm. Its color is milk-white, with a narrow, faint yellow band in the middle of the whorls between the sutures. There are ar least two whorls in the protoconch. They are depressed, and helicoid. Their axis is at right angles to that of the succeeding turns, in the first of which they are about one-half immersed. The eight whorls of the teleoconch are well rounded, depressed at the summit, and somewhat contracted at the sutures. They are marked by slender, almost vertical axial ribs, of which 20 occur upon the first and second, 22 upon the third, 24 upon the fourth, 26 upon the sixth and penultimate turn. The intercostal spaces are twice as wide as the ribs. They are marked by a series of moderately strong pits at the periphery, and about twenty-six well incised, equal and subequally spaced spiral striations,which pass up on the side of the ribs but do not cross their summits. The periphery of the body whorl is angulated. The base of the shell is short, and well rounded. It is marked by the very feeble continuations of the axial ribs and about twelve equally strong, slender, wavy, spiral striations. The aperture is defective, rhomboidal ? [1]

Distribution

The type specimen was found in the Pacific Ocean off Panama.

References
  1. Dall & Bartsch (1909), A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 57
  2. WoRMS (2011). Turbonilla imperialis Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576041 on 2012-03-01
  3. Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:
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