Odostomia terebellum

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

Odostomia terebellum
Apertural view of the shell of Odostomia terebellum
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Odostomia
Species:
O. terebellum
Binomial name
Odostomia terebellum
(C.B. Adams, 1852) [1]
Synonyms
  • Cingula terbellum C.B. Adams, 1852 (basionym)
  • Liamorpha terebellum (C.B. Adams, 1852)
  • Odostomia (Miralda) terebellum (C.B. Adams, 1852)

Description

The milk-white shell has an elongate, ovate shape. Its length measures 2.2 mm. The whorls of the protoconch are completely immersed in the first of the succeeding turns, above which the tilted edge of the last volution only projects, which shows faint traces of spiral lirations. The whorls of the teleoconch are ornamented with two strong spiral lamellae, the first of which renders the summit of the whorls decidedly tabulated, while the second one is situated a little posterior to the posterior termination of the anterior third between the sutures. Both lamellae are faintly nodulous; the posterior one slightly more so than the anterior. The deep channel between the two keels is marked by very feeble slender axial threads. The periphery of the body whorl is marked by a lamella a little less strong than those between the sutures. The base of the shell shows two lamellae, the anterior of which is immediately behind the columella and much less developed than the median one, which is somewhat weaker than the peripheral lamella. The depressed spaces between these lamellae are crossed by axial threads, as on the spire. The aperture is irregularly ovate. The posterior angle is decidedly obtuse. The outer lip is rendered angular by the spiral lamellae. The columella is strong, somewhat twisted, reinforced by the base.[4]

Distribution

This species occurs in the Pacific Ocean off Panama Bay

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References
  1. C. B. Adams, Ann. Lyc. Nat. Hist. of N. Y., 1852, p. 406
  2. WoRMS (2011). Odostomia terebellum (C.B. Adams, 1852). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575916 on 2011-11-29
  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, United States National Museum Bulletin 68,p. 177-178; 1909
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