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Taxon profile

species

Ilanga platypeza Herbert, 1987

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Trochida »  family Solariellidae »  genus Ilanga

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Ilanga platypeza

Author: Herbert, D.G.

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Description

Diagnosis: Shell of moderate height, trochoid-turbiniform, whorls shouldered and flat sided; periphery well below mid-whorl, base distinctly flattened; sculpture of relatively sharp spiral cords and fine growth-lines; umbilicus strongly corded, margin rounded, Patterned with brownish axial flames and blotches.
Description: Shell of moderate height (L/D = 0,67-0,79), trochoid-turbiniform, somewhat stepped; whorls flat sided, shouldered; periphery well below mid-whorl, base distinctly flattened; teleoconch of up to 4,5 whorls. Sculpture predominantly spiral, consisting of relatively sharp cords, wedge-shaped in profile; first whorl with 4-5 weak cords which strengthen and develop intermediaries during subsequent whorls; body whorl with ca 10 cords above and including the periphery, usually alternating in strength; cord forming shoulder angle often strongest; cords and intervals subequal; no spiral lirae; cords become obsolete below periphery, and central band of base essentially smooth; cords reappear and strengthen toward umbilicus; some specimens with most of base smooth and glossy. Axial sculpture of numerous very fine to microscopic growth-lines. Umbilicus deep, of moderate width and with well-developed, rounded spiral cords, particularly near margin which is evenly rounded and not clearly separable from base; umbilical cords irregularly granulated by growth-lines, some strong. Aperture ovoid to three-cornered, elongated toward periphery; peristome incomplete; outer lip markedly prosocline, weakly crenulated by cords; interior nacreous. Protoconch: Typically solarielline, diameter ca 400 µm, figured specimen somewhat worn. Colour: Ground colour yellowish-white to pale yellow, patterned from second whorl onward with blotches and axial flames in various shades of brown; often a spiral band of irregularly shaped darker brown blotches on the shoulder; paler axial flames between shoulder and periphery; base usually with a spiral band of pale blotches near umbilical margin, but sometimes without colour pattern. A weak pink/green iridescence in fresh specimens.
Dimensions: Holotype, length 4,4 mm, diameter 5,6 mm; largest specimen, length 4,5 mm, diameter 6,3 mm.
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Interchangeable taxa

A distinctive, relatively shallow water species, recognised by its comparatively strongly corded, flat-sided whorls
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Distribution

Distribution: South-Africa. South-western Transkei to eastern Cape Province, 32-70 m (living specimens 41-70 m, sand).
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.
Author: Jan Delsing

Similar species

Ilanga furtiva Herbert, 1987

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Ilanga platypeza Herbert, 1987]
Data retrieved on: 22 November 2013

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