Pyramidella mazatlanica

Pyramidella mazatlanica is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2]

Pyramidella mazatlanica
Drawing of a shell of Pyramidella mazatlanica
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Pyramidella
Species:
P. mazatlanica
Binomial name
Pyramidella mazatlanica
Dall & Bartsch, 1909
Synonyms[1]
  • Pyramidella (Longchaeus) mazatlanica Dall & Bartsch, 1909
  • Pyramidella mazatlantica Dall & Bartsch, 1909 (misspelling)

Description

The shell has a very regularly conic shape. It has a horn color, with a little darker band on the middle between the sutures, which is bordered at its anterior margin by a faint light line. Its length measures 11 mm. The two whorls of the protoconch form a depressed helicoid spire. Its axis is at right angles to that of the succeeding turns, in the first of which it is about two-thirds immersed. The thirteen whorls of the teleoconch are flattened. They are scarcely at all contracted at the suture, with a narrow, very finely crenulated shoulder at the summit. The suturesare well impressed. The periphery of the body whorl is strongly, sharply, and deeply sulcate. The base of the shell is short, well rounded, and with a strong fasciole at the insertion of the columella. The entire surface of the spire and the base is marked only by lines of growth. The aperture is irregularly oval. The posterior angle is acute, with a moderate channel anteriorly. The outer lip is thin. It is reinforced by four strong internal lirations, two of which are above and two below the periphery. The columella is slender, twisted and revolute. The posterior fold is lamellar, the anterior two slender and very oblique.[3]

Distribution

This marine species occurs in the Pacific Ocean from Southern California to southern Mexico.

gollark: How does x86 machine code handle *arguments*?
gollark: Second byte?
gollark: That's... oddly convenient.
gollark: btw, android bad
gollark: image os™: your entire OS is both a disk image and giant some-format-or-other image.

References
  1. WoRMS (2011). Pyramidella mazatlanica Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575945 on 2012-01-12
  2. Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064
  3. Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 21-22: 1909
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.