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Taxon profile

species

Psittacodrillia diversa (E. A. Smith, 1882)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Horaiclavidae »  genus Psittacodrillia

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Psittacodrillia diversa

Author: Kilburn, R.N.

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Description

Diagnosis: Shell biconic-claviform with greatest width more or less median, b/l 0,44-0,47, a/l 0,36-0,42. aperture relatively large, whorls weakly convex anteriorly, slightly concave posteriorly, not swollen below suture; no fasciole; anal sinus moderately shallow, opening directed slightly anteriorly; axial ribs low, 9-11 on penultimate whorl, spiral lirae fine, over whole external surface, 16-20 on penultimate whorl; orange, ribs pale, with brown intervals; protoconch breadth 1,35 mm. Attains 14,9 mm.
Description: Shell biconic-claviform (b/l 0,44-0,47, a/l 0,36-0,42), spire orthoconic, aperture relatively large, teleoconch whorls about 4, suture shallow, each whorl rising high up its predecessor; whorls anteriorly weakly convex, not shouldered, shoulder slope very shallowly concave, no distinct subsutural cord, periphery of body whorl strongly convex, left side of base slightly concave, fasciole not developed, without a distinct false umbilicus. Aperture oblong, greatest width at about posterior third, siphonal canal wide, its end not notched; columella only slightly convex, parietal region concave; callus moderately thick, on columella with slightly free edge, in parietal region thinner except for a large posterior pad, which constricts entrance to anal sinus; labrum in side-view gently convex, without a stromboid notch; anal sinus moderately shallow, asymmetrically U-shaped, its opening directed somewhat abapically.
Sculptured by moderately low, short, rounded axial ribs, crossed by fine spiral threads; no varices. Axial ribs subequal to their intervals, with rounded crests and gently sloping sides, opisthocline, evanescing on shoulder slope and at level of parietal pad, obsolete on last third of body whorl; 1st half-whorl with fine, arcuate riblets, little stronger than the spiral sculpture, followed by 10-12 ribs on early whorls, 9-11 on penultimate one. Spiral lirae fine and rapidly worn away; 9-12 on 1st whorl, 16-20 on penultimate one, 20-26 on base of body whorl. Colour light to moderate orange overall, except for crests of ribs, which are paler, and, as a rule, their intervals, which are strong brown. Periostracum lacquer-like, brown. Protoconch domed, limits not apparent, but evidently of about 2 whorls, last whorl with faint spiral striae and traces of very fine, arcuate axial riblets terminally; breadth 1,35 mm, height 0,95-1,15 mm (b/h 1,17-1,42). Dimensions: 11,3x5,3 mm; attains 14,9 mm (lip broken).
Kilburn, R.N., 1988. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 4. Subfamilies Drillinae, Crassispirinae and Strictispirinae

Distribution

South Africa. Range: Eastern Cape and western Transkei littoral.
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 Psittacodrillia diversa Smith, 1882]
Data retrieved on: 22 November 2013

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