Ancilla Ancilla adelphe
Distribution: Western Indo-Pacific realm. Western Indian Ocean Province (Madagascar.)
Distribution: Western Indo-Pacific realm. Western Indian Ocean Province (Madagascar.)
"Diagnosis: Shell oblong-ovate, width 0,48-0,50 of length, spire orthoconic, blunt, angle 55°-60°, elevated, aperture/total length 0,65-0,69; ancillid groove and band absent, fasciolar band slightly convex and raised; columella pillar fairly narrow, not strongly twisted, lirae four, paries gently convex, parietal ridge obscure, without callus, base of fasciole and columella pillar feebly and minutely micro-shagreened; colour more or less yellowish-white with a brownish-orange sutural line, fasciole and columella white, aperture light orange-yellow; maximum length 14,4 mm.
Description:
Quantitative (N = 2):
Breadth/length: 0,48-0,50
Aperture/total length: 0,65-0,69
Spire angle: 55°-60°
Maximum dimensions: 14,4 x 6,9 mm
Minimum dimensions: 13,0 x 6,5 mm
Shell oblong-ovate, with evenly convex sides, maximum width median; spire relatively high, rather blunt, orthoconic with almost flat whorls, sutural callus narrow. Aperture with its greatest width just anterior to median, tapering slightly anteriorly; base slightly oblique, siphonal canal wide, shallowly notched. Surface smooth, save for very fine to feeble microshagreen sculpture on fasciole and columella pillar. Ancillid groove, band and denticle absent; fasciolar band slightly declivous and a little convex, anterior fasciolar groove moderately deep. Columella pillar fairly narrow, not strongly twisted; lirae 4, strongest externally, becoming weaker towards lip, outer one sometimes weakly bifid; columella lip gently convex, 0,46-0,47 of total length of labrum; basal sinus shallow and rather wide. Paries gently convex, with feeble indications of a parietal ridge, and no trace of callus deposit. Labrum rather thin, prosocline and slightly sinuous in side view. Teleoconch whorls about 3. Protoconch sharply delimited, of about 1,5 whorls, narrowly domed, apex well rounded, translucent white; maximum diameter about 1,5 mm. Ground colour between yellowish-while and pale orange-yellow, becoming progressively fainter towards the apex; fasciolar band and columella pillar white; aperture light orange-yellow.".