Odostomia aequisculpta

Odostomia aequisculpta
Apertural view of a shell of Odostomia aequisculpta
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia clade Euthyneura clade Panpulmonata
Superfamily:	Pyramidelloidea
Family:	Pyramidellidae
Genus:	Odostomia
Species:	O. aequisculpta
Binomial name
Odostomia aequisculpta Carpenter, 1864 [1]
Synonyms [2]
Odostomia (Evalea) aequisculpta Carpenter, 1864 Odostomia (Menestho) aequisculpta Carpenter, 1864

Odostomia aequisculpta is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. ^{[3] [4] [5]}

Description

The elongate-ovate shell is semitranslucent. Its length measures 2 mm. The whorls of the protoconch are deeply obliquely immersed, the tilted edge of the last only being visible. The whorls of the teleoconch are rounded, somewhat inflated. They are marked by strong, well-rounded, equal spiral keels, of which 4 occur upon the first, 5 on the second, and 6 between the sutures upon the penultimate turn, half of the peripheral one falling in the suture. Here too there is a tendency in the one at the summit to become split. The periphery and the base of the body whorl are well rounded. They are marked by six spiral cords, which grow successively weaker from the periphery to the base. The spaces between the cords and spire and base are narrow, marked by numerous, decidedly retractive axial threads. The sutures are well impressed. The aperture is broadly oval, somewhat effuse anteriorly. The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The columella is strong, decidedly reflected anteriorly, reinforced by the base. It is provided with a small fold at its insertion. The parietal wall is covered with a faint callus. ^[2]

Distribution

This species occurs in the Pacific Ocean off Cabo San Lucas, Baja California.

References

1. Carpenter, Ann. Mag. Nat. Hist., 3d ser., vol.14, 1864, pp. 46, 47
2. A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, 1909 Plate 20 # 3
3. Rosenberg, G. (2011). Odostomia aequisculpta Carpenter, 1864. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575817 on 2011-10-26
4. Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN   1-888569-01-8. IX, 526 + cd-rom pp.
5. Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:

External links

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