Odostomia mammillata

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

Odostomia mammillata
Apertural view of a shell of Odostomia mammillata
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. mammillata
Binomial name
Odostomia mammillata
Carpenter, 1856

This species has been reported by G.W. Tryon as Odostomia mamillata Carp. in his book Manual of Conchology vol. VII, page 359 (1889).

Description

The ovate, milk-white shell lacks axial or spiral sculpture excepting microscopic growth lines. The length of the shell is 1.1 mm. The whorls are flattened. The whorls of the protoconch are large, oblique and two-thirds immersed in the first of the succeeding turns. The whorls of the teleoconch are decidedly flattened, smooth and rather high between the sutures. The sutures are well impressed. The periphery is marked by a slender, raised cord, which renders it angulated. The base of the shell is rather short and slightly inflated immediately below the umbilical area. The aperture is broadly oval. The posterior angle is acute. The outer lip is thin and angulated at the periphery. The columella is short, slender, strongly curved and slightly reflected. The parietal wall is covered by a strong callus. [3]

References
  1. WoRMS (2011). Odostomia mammillata Carpenter, 1856. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575868 on 2011-11-10
  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. "A Monograph of West American Pyramidellid Mollusks" , William Healy Dall and Paul Bartsch , Smithsonian Institution, 1909
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