Odostomia exarata

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Odostomia exarata
Odostomia exarata 001.png
Aperturtal view of the shell of Odostomia exarata
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Odostomia
Species:
O. exarata
Binomial name
Odostomia exarata
Carpenter, 1856 [1]
Synonyms
  • Miralda exarata (Carpenter, P.P., 1857)
  • Odostomia (Miralda) exarata Carpenter, 1856
  • Parthenia exarata Carpenter, 1856

Odostomia exarata is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies. [2] [3]

Contents

Description

The elongate-ovate shell is white. Its length is 6.3 mm. The whorls of the protoconch are obliquely immersed, with only the tilted edge of the last volution visible. The five whorls of the teleoconch are marked by two spiral keels which divide the space between the sutures into three equal parts. The posterior of these keels shows weak crenulation. The periphery of the body whorl is marked by a third keel which is almost as strong as those on the spire. A fourth keel, which is considerably less strong, occupies the middle of the base. The rounded spaces between the keels are marked by feeble lines of growth. The aperture is irregularly oval. The posterior angle is obtuse. The outer lip is angulated by the keels. The columella is strong, reflected, and provided with a weak fold at insertion. The parietal wall is covered with a thin callus. [4]

Distribution

This species occurs in the Pacific Ocean off the Galapagos Islands. The type specimen was found offMazatlán, Mexico.

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References

  1. ↑ Carpenter, Cat. Mazatlan Shells, 1856, pp. 115
  2. ↑ WoRMS (2011). Odostomia exarata Carpenter, 1857. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575843 on 2011-11-10
  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. ↑ "A Monograph of West American Pyramidellid Mollusks" , William Healy Dall and Paul Bartsch , Smithsonian Institution, 1909]
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