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Taxon profile

species

Ilanga impolita Herbert, 1987

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

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Ilanga impolita

Author: Herbert, D.G.

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Description

Diagnosis: Shell small, moderate to high turbiniform; whorls rounded, suture slightly sunken; entire surface of teleoconch covered with fine lirae giving a dull, lustreless finish. Colour pattern of dark brown subsutural blotches and lighter brown axial flames.
Description: Shell moderate to high turbiniform (L/D = 0,79-0,88), evenly conical; whorls rounded, slightly flattened at shoulder, suture weakly sunken; periphery at mid-whorl; teleoconch of up to 3,5 whorls. Sculpture of numerous fine spiral lirae beginning at start of first teleoconch whorl and continuing to aperture; base and umbilicus with similar lirae. Axial sculpture of microscopic growth-lines, but usually obsolete. Umbilicus deep, moderately wide; margin evenly rounded and not demarcated from base; umbilical lirae slightly wider apart than those on base; one or two axial pliculae marking growth phases, otherwise no axial sculpture. Aperture subcircular, peristome complete or nearly so; outer lip prosocline, smooth; interior nacreous.
Protoconch: Typically solarielline, diameter 460-500 µm.
Colour: Ground yellowish-white, patterned with deep brown blotches close to suture, below which are fine orange-yellow to light brown axial flames; flames coalesce peripherally forming fewer, thicker axial bands which extend on base towards, but not into, umbilicus. Protoconch and early teleoconch yellowish-white to pale yellow; colour pattern developing only toward end of second whorl. Shell with a dull, lustreless finish.
Dimensions: Holotype, length 3,1 mm, diameter 3,8 mm (= largest specimen).
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Interchangeable taxa

A small, distinctive species characterised by its rounded whorls, dull, lirate sculpture, and colour pattern. Similar in overall shape to I. polita sp. n., but that species is smooth, glossy and lacks colour pattern.
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.

Distribution

Distribution: Known only from central and south-western Transkei, 68-420 m (none living).
Herbert, D.G., 1987. Revision of the Solariellinae (Mollusca: Prosobranchia: Trochidae) in southern Africa.
Author: Jan Delsing

Similar species

Ilanga polita 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 impolita Herbert, 1987]
Data retrieved on: 22 November 2013

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