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Taxon profile

species

Microdrillia patricia (J. C. Melvill, 1904)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Borsoniidae »  genus Microdrillia

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Microdrillia patricia

Author: Kilburn, R.N.

Microdrillia patricia

Author: Kilburn, R.N.

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Description

Shell narrowly claviform, b/1 0,35, a/1 0,35-0,36, fasciole distinct, peripheral keel strong, at or slightly above midwhorl, whorls with an angular non-bifid subsutural cord and 2-3 lirae anterior to peripheral keel, base of body whorl with 7-9 spiral lirae, those on rostrum very feeble; collabral threads strong, particularly on shoulder sulcus; pale buff with brownish-orange columella; protoconch of 6 whorls, last 21 with oblique axial riblets, 15-16 on last whorl, and a shallow suprasutural channel crossed by axial striae, protoconch breadth 0,78-0,83 mm. Maximum length 7,3 mm.
Description: Shell narrowly claviform with high spire (b/10,35, a/10,35-0,36), base subtruncate, its sides moderately concave, with a narrow false umbilicus and distinct fasciole; suture moderately deep; teleoconch whorls about 51; whorls moderately convex, peripheral keel below median on early whorls, slightly above midwhorl on penultimate one. Aperture rather small, greatest width at about posterior third, labial callus fairly thick; labrum thin, with deep anal sinus (damaged in all types); siphonal canal shallowly indented.
Sculpture of strong spiral cords and sigmoid collabral threads. Early whorls with a subsutural lira, a projecting peripheral keel and a weak anterior lira; from 2nd or 3rd whorl another lira shows just above suture and an intermediary thread may also develop; penultimate whorl with an angular, non-bifid subsutural cord, a gently concave shoulder sulcus (without spiral sculpture), a peripheral keel, and 2-3 lirae anteriorly, the latter thinner and much lower than keel; base of body whorl with 7-9 lirae, becoming weaker anteriorly and very feeble on rostrum. Collabral threads strong, particularly on shoulder sulcus. Glossy, near pale orange-yellow, columella darker.
Protoconch cyrtoconic, 6 whorls, first 3,5 smooth, rest with arcuate, opisthocline axial riblets; 15-16 on last whorl, ending a little above suture in tapering forward-projecting 'tails', leaving a shallow suprasutural channel that shows very fine, prosocline axial striae; breadth 0,78-0,83 mm, height 1,1 mm (b/h 0,76). Dimensions: 6,0 X 2,1 mm; length 7,3 mm (lip broken).
Kilburn, R.N., 1986. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 3. Subfamiliy Borsoniinae.

Distribution

Gulf of Oman to continental shelf of western Transkei.
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 Microdrillia patricia (Melvill, 1904)]
Data retrieved on: 22 November 2013

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