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Taxon profile

species

Ilanga lirellata Herbert, 1987

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

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Ilanga lirellata

Author: Herbert, D.G.

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Description

Diagnosis: Shell moderate to high turbiniform; whorls more or less evenly rounded, but with a distinct shoulder. Sculpture of very fine spiral lirae and microscopic growth-lines, giving a lustreless finish. Umbilical margin distinctly angled and pliculate. Colour pattern of irregular zigzag axial bands in shades of brown.
Description: Shell moderate to high turbiniform (L/D = 0,77-0,83), whorls more or less evenly rounded, but with a distinct tabulate shoulder; periphery at or just below mid-whorl, base slightly flattened, teleoconch of up to 4,5 whorls. Sculpture of numerous irregularly spaced, microscopic, spiral lirae; lirae present on all teleoconch whorls, but fewer and stronger on first whorl, becoming obsolete toward end of body whorl; base also finely Urate, somewhat glossy. Axial sculpture of microscopic, prosocline growth-lines, sometimes forming very faint pliculae on shoulder. Umbilicus deep, of moderate width; margin distinctly angled and with well-developed pliculae; interior with 2-4 relatively strong lirae and occasional finer ones. Aperture subcircular, slightly flattened at columella lip; peristome of adult complete or nearly so; outer lip smooth; basal lip often notched at umbilical angulation; interior nacreous.
Protoconch: Typically solarielline, diameter ca 380 µm. The specimen figured is very fresh and shows a relatively coarse microsculpture.
Colour: Ground colour yellowish-white to pale yellow, early whorls often brilliant to vivid yeUow between shoulder and abapical suture, greyish-olive between shoulder and adapical suture, particularly when live-taken; colour pattern develops during second whorls and comprises irregular zig-zag axial bands in various shades of brown; bands coalesce on shoulder angle forming bold V-shaped marks; bands fewer and broader at periphery and on base, not or only faintly extending into umbilicus. Protoconch white to pale yellow.
Dimensions: Holotype, length 5,0 mm, diameter 6,0 mm; largest specimen, length 5,0 mm, diameter 6,1 mm.
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Interchangeable taxa

A fairly distinct species, characterised by its height, relatively small size, shouldered whorls, microlirate sculpture and angular, pliculate umbilical margin.
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Distribution

South-Africa. Known only from Durban and neighbouring areas, 65-100 m (living specimens 70-90 m, fine sand and sandy mud).
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.
Author: Jan Delsing

Links and literature

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

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