Longchaeus auricoma

Longchaeus auricoma is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.[2][3]

Longchaeus auricoma
Drawing of a shell of Longchaeus auricoma
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Genus:
Longchaeus
Species:
L. auricoma
Binomial name
Longchaeus auricoma
(Dall, 1889) [1]
Synonyms

Pyramidella auricoma Dall, 1889

Description

The shell has a regularly elongate-conic shape. It is yellowish-white, with fine golden yellow spiral lines between the sutures and on the base. Its length measures 10.6 mm. The whorls of the protoconch are small, deeply obliquely immersed in the first succeeding turn. The ten whorls of the teleoconch are well rounded, feebly shouldered at the summit, scarcely at all contracted at the sutures. The sutures are weakly impressed. The periphery and the base of the body whorl are well rounded and smooth. The aperture is irregularly oval. The outer lip is thin. It is reinforced deeply within by five strong spiral cords, one of which is at the periphery, two divide the space between this and the summit into three equal parts, and two a little less strong are on the base. The columella is strong and straight. The posterior fold is oblique, very strong and lamellar. The anterior two are about one-fourth as high as the posterior, very oblique. The parietal wall is glazed by a thin callus.[4]

Distribution

This marine species occurs in the Gulf of California and off Mazatlán, Mexico.

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References
  1. Dall, Blake Report, Gastropoda, 1889, p. 332
  2. Bouchet, P. (2015). Longchaeus auricoma (Dall, 1889). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=866674 on 2016-05-24
  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. Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 19: 1909
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