Bolma boucheti, Alf & Kreipl, 2011

Alf, Axel & Kreipl, Kurt, 2011, A new species of Bolma from New Caledonia, add _ journal _ name _ here 34 (1), pp. 3-8 : 4-6

Bolma boucheti spec. nov.

Figs 1 , 2A- C

Types. Holotype: height 7.7 mm, width 7.8 mm, fresh dead shell with operculum.In the MNHN, Paris ( MNHN 23797 ) ( Fig. 1 ) . – Paratypes ( Fig. 2A- C ) [height/width]: No. 1: 5.7/ 6.2 mm, fresh dead shell ( Fig. 2A ). No. 2: 6.1/ 7.4 mm, dead shell with operculum ( Fig. 2B ). No. 3: 7.0/ 6.3 mm, fresh dead shell ( Fig. 2C ). All paratypes from New Caledonia, N. W. Bellona, [EBISCO, stn. DW2564], 20°25'S 158°41'E, 333-386 m deep. All paratypes in the MNHN , Paris ( MNHN 23798 ) .

Type locality: New Caledonia: NW Bellona, [EBISCO, stn. DW2577], 20°20'S 158°39'E, at 399-602 m depth .

Description

Shell quite small for a Bolma , coniform with straight sides, spire angle about 70° (seen from the top of the shell), adults reaching a size of about 7 to 8 mm. Thin shelled and light, adult shells are as tall as wide. Protoconch white, 1.25 whorls. Teleoconch of 5 whorls, these angled at the periphery. First whorl flat with an angular periphery and increasing axial ridges which turn into peripheral protrusions and subsutural beads after 1.5 whorls. Following whorls with fine, prosocline lamellae; above periphery with 4 primary rows of smooth beads, those of the row nearest the suture much larger than the others; secondary rows of beads insert from the last 1.5 whorls, body whorl of holotype with 7, body whorl of paratypes with 6 rows of beads. Space between suture and first row of beads narrow, only channelled in one paratype specimen. With a row of small, scaly protrusions at the peripheral angle. These protrusions consist of minute spines which are open towards the front side. Outer edge of the base marked by a row of large, smooth beads. Space between peripheral and basal angle lamellate with 1 row of smaller beads. Base smooth, with well defined axial ridges which may separate a row of beads at the outer edge by a groove. Columella smooth and evenly rounded, columellar callus thin, extending to about 20 % of the base, aperture oval, outer lip slightly expanded in adult specimens. No umbilicus, but umbilical area covered with a callus in adults. Basic colour light to very light pink or yellow (paratype 1), some of the peripheral protrusions with light reddish-brown markings. Columella white and nacreous, aperture nacreous within. Operculum thick, convex, smooth, of white colour.

Bolma boucheti spec. nov. like most other species of Bolma is a deep sea turbinid, found between 330- 600 m depth.

Figures

Fig. 1. Bolma boucheti spec. nov., holotype (MNHN 23797), fresh dead shell with operculum and drill hole in the base, height: 7.7 mm.

Fig. 2. Bolma boucheti spec. nov., paratypes (all MNHN 23798). A. Paratype 1, fresh dead shell with drill hole, height: 5.7 mm. B. Paratype 2, dead shell with drill hole, height: 6.1 mm. C. Paratype 3, fresh dead shell, height: 7.0 mm.