Pyramidella gracilis

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

Pyramidella gracilis
Drawing of a shell of Pyramidella gracilis
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Pyramidella
Species:
P. gracilis
Binomial name
Pyramidella gracilis
A. Adams, 1854

Description

The length of the shell varies between 6 mm and 10 mm.

The whitish, shining shell has a chestnut line above the suture, and on the periphery of the body whorl; The whorls of the teleoconch are flattened, distantly longitudinally costate, and with smooth interstices.

The narrow shell is cylindrical, very pointed at its summit, slender, turreted, brilliant, whitish, slightly striated longitudinally. The elongated spire is formed of fifteen or sixteen somewhat distinct, approximate, convex whorls. The body whorl is divided at its middle by a transverse, narrow, shallow stria. The suture is simple, indistinctly channeled and flattened. The small aperture is oblong and a little narrowed at its extremities. The columella is almost straight, a little turreted at its base, and provided with three folds, the first of which is more marked. The thin outer lip is sharp and obliquely sinuous in the middle of its length. Its lower extremity extends a little beyond the columella, and forms in this part a shallow contraction or little gutter.[3][4]

Distribution

This marine species occurs in the following locations:[1]

References
  1. WoRMS (2010). Pyramidella gracilis A. Adams. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=208427 on 2012-01-12
  2. Odhner, N.H.J. (1919). Contribution a la faune malacologique de Madagascar. Arkiv For Zoologi, K. Svenska Vetenskapsakademien 12(6). 52 pp, 4 pl.
  3. Kiener (1840). General species and iconography of recent shells : comprising the Massena Museum, the collection of Lamarck, the collection of the Museum of Natural History, and the recent discoveries of travellers; Boston :W.D. Ticknor,1837 (described as Pyramidella gracilis)
  4. G.W. Tryon, Manual of Conchology vol. VIII p. 310; 1889
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