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Taxon profile

species

Mitromorpha volva G.B. Sowerby III, 1892

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Mitromorphidae »  genus Mitromorpha

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Mitromorpha volva

Author: Jan Delsing

Mitromorpha volva

Author: Kilburn, R.N.

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Description

Shell cylindric-biconic, apex somewhat papilliform, spire whorls moderately convex with basal periphery; columella pleats feeble, labrum smooth inside, anal sinus very slight, no subterminal varix; no axial ribs, 5-7 rounded spiral lirae on penultimate whorl, 14-16 on base; protoconch breadth 0,63-0,73 mm (b/h 1,07-1,70), 1st whorl depressed; orange-brown or white; length 6,0 mm.
Description: Shell cylindric-biconic (b/1 0,38-0,42, a/1 0,45-0,50), greatest width slightly anterior to middle, spire slightly cyrtoconic, apex somewhat papilliform; teleoconch whorls 4, early whorls flat, later ones moderately convex with basal periphery, periphery of body whorl also moderately convex, left side of base concave. Aperture somewhat sinuous, curved and parallel-sided anteriorly, posteriorly acute; labial callus thin, particularly in parietal region, columella plicae very feeble; labrum smooth inside, anal sinus very slight, edge not preceded by a varix.
Sculpture of strong, rounded spiral lirae with numerous very fine interstitial axial threads. First teleoconch whorl with 4 spiral lirae, increasing to 5-7 on penultimate whorl, subequal to their intervals, subsutural lira separated by slight gap; base of body whorl with 14-16 lirae, equal to/narrower than their intervals, becoming weaker anteriorly.
Colour uniform moderate orange, paler behind labrum, peripheral cord on body whorl sometimes with paler flecks; frequently white with opaque peripheral spots.
Protoconch of 1,5 whorls, 1st whorl depressed, suture deep, breadth 0,63-0,73 mm, height 0,38-0,50 mm (b/h 1,07-1,70).
Dimensions: 6,0 x 2,3 mm; 6,0 x 2,2 mm, 5,3 x 2,2 mm.
Kilburn, R.N., 1986. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 3. Subfamiliy Borsoniinae.

Distribution

South-Africa. Eastern Cape littoral.
Kilburn, R.N., 1986. Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 3. Subfamiliy Borsoniinae.
Author: Jan Delsing

Similar species

Mitromorpha kennellyi R.N. Kilburn, 1986

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Mitromorpha volva Sowerby, 1892]
Data retrieved on: 22 November 2013

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