Description
Author: Jan Delsing
Text ID: 103274
Text Type: 1
Page: 0
Created: 2020-11-17 20:41:52 - User Delsing Jan
Language: EN
Text function: [[t:1369982,textblock=103274,elang=EN;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
Author: Jan Delsing
Text ID: 103276
Text Type: 19
Page: 0
Created: 2020-11-17 20:43:17 - User Delsing Jan
Language: EN
Text function: [[t:1369982,textblock=103276,elang=EN;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
Author: Jan Delsing
Text ID: 103275
Text Type: 3
Page: 0
Created: 2020-11-17 20:42:39 - User Delsing Jan
Language: EN
Text function: [[t:1369982,textblock=103275,elang=EN;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.