Pyramidella bicolor
Drawing of a shell of Pyramidella bicolor
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Pyramidella
Species:
P. bicolor
Binomial name
Pyramidella bicolor
Menke, 1854 [1]
Synonyms

Pyramidella (Longchaeus) bicolor Menke, 1854

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

Description

The shining shell has an elongate-conic shape. The early whorls are white, the succeeding ones gradually acquiring a pinkish tinge, which deepens and finally tints the last whorl rose-purple. The length of the shell varies between 8 mm and 10 mm. (The whorls of the protoconch are decollated). The eight whorls of the teleoconch are overhanging, flattened, slightly shouldered and minutely crenulated, and deeply sulcate at the periphery. The sutures are strongly impressed. The base of the shell is short, moderately rounded, and with a weak fasciole at the insertion of the columella. The outer lip of the type specimen was badly fractured. The columella is conic, and moderately strong. It is provided with a strong lamellar fold at its insertion, a moderately strong median one and a weaker anterior to it; the last two much more oblique than the posterior.[4]

Distribution

This marine species occurs in the Pacific Ocean along southern Pacific Mexico to Costa Rica.

References

  1. ↑ Menke, Malak. Blatt., vol 1, 1854, p. 28.
  2. ↑ WoRMS (2011). Pyramidella bicolor Menke, 1854. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575937 on 2012-01-12
  3. ↑ Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064
  4. ↑ Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 21-22: 1909
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