Lissospira dalli

Lissospira dalli
	Original drawing of a shell of Lissospira dalli
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Skeneidae
Genus:	Lissospira
Species:	L. dalli
Binomial name
	Lissospira dalli; (A. E. Verrill, 1882)
Synonyms
	Cyclostrema dalli A. E. Verrill, 1882 (original combination); Cyclostrema fulgidum auct. non Jeffreys, 1883; Cyclostrema trochoides auct. non Friele, 1876; Ganesa dalli A. E. Verrill, 1882;

Lissospira dalli is a small species of sea snail, a marine gastropod mollusk in the family Skeneidae.^[1]

Description

The height of the yellowish white shell attains 2 mm, its diameter 2.25 mm. The shell has a trochiform shape and contains 3½ whorls that enlarge rapidly. They are well rounded, with a deeply impressed suture. The apical whorl is a little prominent, visible in a side-view. The body whorl is ventricose. The aperture is nearly circular. The outer lip shows a slight angle anteriorly. The columella is evenly curved The base of the shell contains seven or eight spiral incised lines. They number seven or eight and cover the base of the shell and the umbilical depression. The umbilicus is imperforate or represented by a very narrow chink. The surface of the pale shell is nearly smooth, except for very fine, minute striations or growth lines, which give the surface a dull appearance. The freshest specimens have only a slight luster.^[2]^[3]

Distribution

This species occurs in the Atlantic Ocean off North Carolina, USA, at depths between 668 m and 1569 m.

References

^ Rosenberg, G. (2012). Lissospira dalli (A. E. Verrill, 1882). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532978 on 2012-09-01
^ Verrill, A. E. 1882. Catalogue of marine Mollusca added to the fauna of the New England region, during the past ten years. Transactions of the Connecticut Academy of Arts and Sciences 5: 451-587, pls. 42-44, 57-58 (described as Cyclostrema dalli)
^ G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia (described as Cyclostrema dalli)

External links

[WoRMS-1] Rosenberg, G. (2012). Lissospira dalli (A. E. Verrill, 1882). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=532978 on 2012-09-01

[2] Verrill, A. E. 1882. Catalogue of marine Mollusca added to the fauna of the New England region, during the past ten years. Transactions of the Connecticut Academy of Arts and Sciences 5: 451-587, pls. 42-44, 57-58 (described as Cyclostrema dalli)

[3] G.W. Tryon (1888), Manual of Conchology X; Academy of Natural Sciences, Philadelphia (described as Cyclostrema dalli)

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