Odostomia donilla

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

Odostomia donilla
Apertural view of a shell of Odostomia donilla
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. donilla
Binomial name
Odostomia donilla
Dall & Bartsch, 1909
Synonyms

Odostomia (Evalea) donilla Dall & Bartsch, 1909 (basionym)

According to ITIS, this species is a synonym of Odostomia gravida Gould, 1853.[3] Dall & Bartsch made the distinction based upon the length of the adult shell (O. donilla 4.5 mm and O. gravida 6.5 mm) and the incised spiral lines moderately strong in O. donilla, but exceedingly fine in O. gravida.

Description

The broadly conic shell is bluish-white. It measures 4.5 mm. The nuclear whorls are deeply obliquely immersed in the first of the succeeding turns, above which only the tilted edge of the last volution projects. The six post-nuclear whorls are well rounded, slightly contracted at the suture and appressed at the summit. The periphery of the body whorl is angulated. The base of the shell is slightly rounded, sloping abruptly from the periphery to the umbilical area. The sutures are slightly impressed. The entire surface of the base and the spire is marked by numerous almost vertical lines of growth and many well-incised spiral striations. The aperture is ovate, slightly effuse anteriorly. The posterior angle is acute. The outer lip is thin. The columella is strongly curved, reflected, reinforced by the base, and provided with a strong fold at its insertion.[4]

Distribution

This species occurs in the Pacific Ocean off California.

References
  1. WoRMS (2011). Odostomia donilla Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575839 on 2011-10-26
  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. ITIS: Odostomia donilla
  4. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909
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