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Taxon profile

species

Melanopsis trifasciata Gray, 1843

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  family Melanopsidae »  genus Melanopsis

Least Concern LC

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Melanopsis trifasciata

Author: Suter, H.

Taxon in country check-lists*

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Description

Shell ovate, rather thin, smooth, the spire very often much eroded. Sculpture consisting of irregular growth-striae, very often developed into folds, giving the shell an irregularly costellate appearance; some specimens are slightly wrinkled and malleated. Colour dark olive, the last whorl with 1 or 3, rarely 2, chestnut spiral bands, the first above, the second below the periphery, and the third at the base, the latter 2 a little closer together. Epidermis solid, dull or only faintly shining. Spire short, conical, acute, about one-third the length of the shell ; outlines straight. Protoconch conical, of 1 very rapidly increasing costellate whorl. Whorls 3 to 4, very rapidly increasing, flat, the last very large, slightly ventricose ; base convex, depressed upon the neck. Suture superficial. Aperture large, elongately oval, sharply angled above, distinctly notched below. Interior light blue, with chestnut spiral bands. Outer lip simple, acute, sometimes sinuate toward the base, and roundly produced beyond the end of the columella. The columella is strongly callous above, the callus white near the margin, yellowish-brown inside, then excavated, concavely twisted at the base, and sometimes with a few short folds on the outer margin.
Operculum obliquely striate, thin, horny ; nucleus terminal.
Diameter, 11 mm. ; height, 18 mm. (medium-sized specimen). Diameter, 17 mm. ; height, 30 mm. (large specimen).
Type in the British Museum.
Hob.—Waitangi Falls (Dieffenbach) ; Henderson, near Auckland (H. S.) ; Whangarei ; River Thames ; Petane Creek, near Napier ; Wanganui River ; Collingwood ; Kenepuru Sound ; Greymouth ; Dunedin.
Suter, H. 1913. Manual of the New Zealand Mollusca.
Author: Jan Delsing

Links and literature

EN IUCN Red List of Threatened Species 2018-1 [189217]

IUCN Red List of Threatened Species [http://www.iucnredlist.org/] [as Melanopsis trifasciata (Gray, 1843)]
Data retrieved on: 3 August 2018

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