Odostomia clathratula

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

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

Description

The elongate-conic, slender shell is vitreous. It measures 2.5 mm. The two and one-half nuclear whorls form a depressed helicoid spire, whose axis is almost at right angles to that of the succeeding turns, in the first of which it is about one-half immersed. The seven post-nuclear whorls are very slightly rounded, strongly constricted at the sutures and prominently shouldered at the summit. They are marked by well rounded, tuberculate, axial ribs, of which 14 occur upon the first and second, 16 upon the third, 18 upon the fourth and fifth, and 24 upon the penultimate turn. In addition to the axial ribs, the whorls are marked between the sutures by four spiral cords which equal the ribs in strength, and render them tuberculate at their junction. The sutures are broadly and deeply channeled. The periphery and the somewhat prolonged base of the body whorl are well rounded, the latter marked by seven narrow, almost equal, and equally spaced spiral keels, the broad space between which and the peripheral sulcus are marked by many slender axial riblets. The aperture is oval. The outer lip is thin, showing the external sculpture within. The columella is stout, slightly curved, strongly reflected over the reinforcing base, provided with a strong fold at its insertion. ^[4]

Distribution

The species occurs in the Pacific Ocean off the Galapagos Islands and Panama.

References

1. C. B. Adams, Ann. Lye. Nat. Hist. N. Y., vol. 5, 1852, pp. 389, 390.
2. WoRMS (2011). Odostomia clathratula (C.B. Adams, 1852). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575827 on 2011-10-26
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. William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909

External links

• To USNM Invertebrate Zoology Mollusca Collection
• To World Register of Marine Species