Egila lacunata

Egila lacunata
	Apertural view of the shell of Egila lacunata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Heterobranchia
Family:	Pyramidellidae
Genus:	Egila
Species:	E. lacunata
Binomial name
	Egila lacunata; (Carpenter, 1856) [1]
Synonyms
	Odostomia lacunata Carpenter, 1857; Odostomia (Egila) lacunata (Carpenter, 1856); Parthenia lacunata Carpenter, 1856 (basionym); Pyrgulina lacunata Carpenter 1857;

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

Description

The white shell is small and oval. Its length measures 1 mm. The whorls of the protoconch are almost completely obliquely immersed in the first of the succeeding turns. The four whorls of the teleoconch are flattened, with subtabulated summits and a deeply sulcated periphery. They are marked by sublamellar, slightly retractive axial ribs, of which 14 occur upon the first and second and 18 upon the penultimate turn. The intercostal spaces are smooth and three times as wide as the ribs. The periphery is deeply and broadly sulcate, bordered on each side by a low spiral cord, crossed by the continuations of the axial ribs. The base of the body whorl is well rounded. It is marked by the axial ribs which continue almost undiminished to the umbilical chink and about twelve spiral lirations. The aperture is oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The columella is slender, curved, and slightly revolute. The parietal wall is covered by a thin callus.[4]

Distribution

The type species was found in the Pacific Ocean off Mazatlán, Mexico.

References

Carpenter, Cat. Mazatlan Shells, 1856, p. 414
Bouchet, P. (2015). Egila lacunata (Carpenter, 1857). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=730712 on 2015-12-13
Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:
William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909 (described Odostomia (Ividella) orariana)

Carpenter P.P. (1857). Catalogue of the collection of Mazatlan Mollusca in the British Museum collected by Frederick Reigen. London, xvi + 552 pp

External links

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[1] Carpenter, Cat. Mazatlan Shells, 1856, p. 414

[WoRMS-2] Bouchet, P. (2015). Egila lacunata (Carpenter, 1857). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=730712 on 2015-12-13

[3] Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064:

[Dall-4] William Healy Dall and Paul Bartsch , "A Monograph of West American Pyramidellid Mollusks" , Smithsonian Institution, 1909 (described Odostomia (Ividella) orariana)