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Taxon profile

species

Crassiclava balteata R.N. Kilburn, 1988

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Pseudomelatomidae »  genus Crassiclava

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Crassiclava balteata

Author: Kilburn, R.N.

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Description

Diagnosis: Shell narrowly claviform (b/l 0,35-0,36, a/l 0,37-0,39), whorls convex with a weak shoulder, subsutural border not swollen; axial ribs moderately strong, crests sharply rounded in cross-section with gradually sloping sides, 8-10 per whorl; spiral lirae feeble, mostly restricted to base of body whorl (where number about 22); anal sinus moderately deep, directed somewhat abapically; orange-brown with narrow peripheral band of pale yellowish. Protoconch with last quarter-whorl axially ribbed, diameter 1,15-1,35 mm. Attains about 17 mm.
Description: Shell narrowly claviform (b/l 0,35-0,36, a/l 0,37-0,39), with high orthoconic spire, rather narrow aperture and short, obliquely truncate base; teleoconch whorls 6, suture shallow, whorls convex, their periphery median, shoulder rather weak and sloping; shoulder slope moderately concave, without even a feeble swelling at suture; left side of base of body whorl gently concave, with a moderate to strong fasciole, false umbilicus present but narrow. Aperture narrowly oblong-pyriform, greatest width at about posterior third, tapering gradually to the wide, terminally unnotched siphonal canal; labial callus thick, outer edge slightly free on columella, parietal pad strong to massive, greatly constricting anal sinus; columella almost straight, parietal wall concave; labrum gently convex in side-view, with a very slight stromboid notch and moderately deep, narrowly and asymmetrically U-shaped anal sinus, directed somewhat abapically.
Sculptured by moderately strong axial ribs, spiral lirae feeble, restricted to base of body whorl, weak striae occasionally present elsewhere, growth-lines coarse, no varices but penultimate rib somewhat pronounced. Axial ribs opisthocline, relatively straight, on 1st whorl suture-to-suture, but on later whorls evanescing on shoulder concavity and on base at level of parietal/columclla junction, final rib somewhat weak; narrower than intervals, crests sharply rounded with gradually sloping sides; 8-10 ribs per whorl throughout. Spiral lirae approximately 22 on base, extending posteriorly at least as high as parietal level. Colour light brown, paler on base, slightly darker on shoulder slope, with a continuous pale peripheral band.
Protoconch narrowly domed, of 2 whorls, gently rounded, smooth except for last quarter-whorl, where there are straight, suture-to-suture axial ribs, termination sharply defined; breadth 1,15-1,35 mm, height 1,25-1,40 mm (b/h 0,92-0,96). Dimensions: 14,5 x 5,1 mm (holotype); smallest paratype 14,3 x 5,1 mm, largest 16.9 mm (lip immature).
Kilburn, R.N., 1988. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 4. Subfamilies Drillinae, Crassispirinae and Strictispirinae

Distribution

South-Africa. Range: Agulhas Bank.
Kilburn, R.N., 1988. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 4. Subfamilies Drillinae, Crassispirinae and Strictispirinae
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 Crassiclava balteata Kilburn, 1988]
Data retrieved on: 22 November 2013

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