Liotipoma lifouensis, Mclean, 2012

Mclean, James Hamilton, 2012, New species and genera of colloniids from Indo-Pacific coral reefs, with the definition of a new subfamily Liotipomatinae n. subfam. (Turbinoidea, Colloniidae), Zoosystema 34 (2), pp. 343-376 : 362-364

Liotipoma lifouensis n. sp.

( Fig. 10 )

TYPE MATERIAL. — Holotype: LIFOU, stn 1434, Loyalty Islands, Lifou, Santal Bay, 20°52.5’S, 167°08.1’E, 5-20 m, ♂ shell, H 2.6, D 4.3 mm ( MNHN 24770, Fig. 10 A-D). Paratype: LIFOU, stn 1432, Shelter Reef, 20°53.5’S, 167°02.7’E, 12-32 m, ♂ shell, H 2.9, D 4.3 mm ( MNHN 24771, Fig. 10 E-H).

TYPE LOCALITY. — Lifou, Loyalty Islands.

DISTRIBUTION. — Lifou, Loyalty Islands.

ETYMOLOGY. — After the type locality, Lifou Island, Loyalty Islands.

DESCRIPTION

Male shell ( Fig. 10 )

Whorls 3.3; profile of medium height for genus; with single keel at periphery, positioned at midwhorl; profile below shoulder with weak basal angulation. Axial sculpture of strong ribs, 22 on final whorl, evenly spaced, strongly spinose at periphery, spines projecting backward throughout final whorl. Spiral sculpture of two prominent cords on shoulder, forming coarsely clathrate sculpture. Base with strong subtending cord, and one strong cord between subtending cord and peripheral cord; emergent cord prominent; base with deep pits on both sides of subtending cord; all basal cords broad, with narrow interspaces. Umbilicus bordered by broad periumbilical cord; axial ribs weak across emergent cord. Umbilicus of moderate width, obstructed by narrow, tongue-like extension of inner lip, extending more than half the diameter of aperture, in same plane as aperture. Final lip massive, extending for ∕₄ of final quarter whorl, with successively decreasing layers of deposition, with indentations conforming to spiral sculpture. Aperture nearly radial, plane of aperture aligned slightly outside of coiling axis. H 2.6, D 4.3 mm (holotype).

Female shell

Unknown.

Operculum

Unknown.

REMARKS

The two illustrated male shells have the long narrow tongue that extends across the umbilicus to connect with the emergent cord, which is a condition unlike that of all other species. The holotype shell has backward projecting spines, but this is not seen in the second male shell ( Fig. 10 E-H). Both specimens have comparable basal sculpture of broad cords with narrow interspaces and coarse clathrate sculpture of the shoulder slope. The specimen shown in Figure 10 E-H has an additional basal cord, compared to the holotype specimen, but this is considered to an intra-specific difference. This species cannot be confused with any other species. It is of the same size as the male shell of L. mutabilis n. sp. ( Fig. 4 ) from Lifou, but has a longer apertural tongue.

Figures

FIG. 10. — Liotipoma lifouensis n. sp., male shells: A-D, holotype (MNHN 24770, stn 1434), male shell, Santal Bay, Lifou, Loyalty Islands,5-20 m, H 2.6, D 4.3 mm; E-H, paratype (MNHN 24771, stn 1432), male shell, Shelter Reef,Santal Bay, Lifou, Loyalty Islands, 12-32 m, H 2.9, D 4.3 mm. Scale bars: 1 mm.

FIG. 4. — Liotipoma mutabilis n. sp., male shells: A-D, holotype (MNHN 24757, stn 1435), Pointe Lefèvre, Santal Bay, Lifou, Loyalty Islands, 5-30 m, H 3.4, D 5.7 mm; E-H, paratype (MNHN 24758, stn 1436), Gaatcha Bay, Santal Bay, Lifou, Loyalty Islands, 10-20 m, H 3.0, D 5.1 mm. Scale bars: 1 mm.