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species

Clavus glaucozona Kilburn & Dekker, 2008

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Drilliidae »  genus Clavus

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Clavus glaucozona

Author: Kilburn, R.N. & Dekker, H.

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Description

Shell narrowly claviform (b/1 0.31-0.37, a/1 0.32-0.38), with a somewhat blunt, acute, orthoconoid spire and short, truncate base; suture shallow but distinct, teleo¬conch whorls about 6, subsutural region shallowly but evenly concave, basal 2-3 of whorl gently and evenly convex, periphery median, on later whorls slightly angular, without shoulder; left side of base of body whorl concave, fasciole slight, without false umbilicus. Aperture oblong-ovate, greatest width more or less median, outer lip somewhat straight medially; siphonal canal moderately wide, truncate, short, termination not indented; inner lip with a thick callus, forming a strong parietal nodule in posterior angle of aper¬ture, constricting anal sinus; outer lip thin, rather straight in side-view, with deep stromboid notch and moderately shallow, openly U-shaped anal sinus, directed slightly adapically.
Glossy, sculptured by low axial ribs, spiral sculpture restricted to 4-6 relatively strong ridges on rostrum. Microsculpture of rather coarse, pliculate collabral threads (particularly strong on last whorl), crossed by much finer spiral striae. Axial ribs on first teleo¬conch whorl straight, orthocline and suture-to-suture, thereafter slightly opisthocline, shallowly arcuate, becoming sigmoid on last whorl, recurved below suture, crests angular, narrower than intervals, on last 3 teleoconch whorls becoming progressively weaker below suture, on base of body whorl evanescing at parietal level, 12 on first whorl, 11-13 on later whorls. Base of ribs with a row of very slight nodules. Terminal varix close to lip, thick, strongly rounded, trailing face somewhat concave.
Colour usually pale grey to greyish-white, mid-body whorl with a broad band of medium- to greyish-brown; all whorls with irregularly spaced, axially oblong blotches of medium to dark brown, with a brown line or row of dots above periphery; basal granules white; base and area behind lip white; protoconch initially white, then brown; aperture deep brown. Sometimes uniform brown, with ribs and basal granules white.
Protoconch domed, of about 1.5 convex whorls, the first somewhat depressed; smooth except for last quarter whorl, where there are a few thin, arcuate axial riblets; breadth 0.68-0.72 mm.
Largest and smallest paratypes are 16.2 * 5.0 mm and 7.2 * 2.8 mm.
= Original description from Kilburn & Dekker, 2008

Distribution

Northern Red Sea: Gulf of Suez to Port Safaga area, and Gulf of Aqaba to Strait of Tiran, littoral.
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 Clavus glaucozona Kilburn & Dekker, 2008]
Data retrieved on: 2 May 2017

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