Pillucina pacifica Glover & Taylor, 2001

Glover, Emily A. & Taylor, John D., 2007, Diversity of chemosymbiotic bivalves on coral reefs: Lucinidae (Mollusca, Bivalvia) of New Caledonia and Lifou, Zoosystema 29 (1), pp. 109-181 : 161

Pillucina pacifica Glover & Taylor, 2001

( Figs 33 ; 34C )

Pillucina pacifica Glover & Taylor, 2001: 266 , figs 2a-g, 3.

TYPE MATERIAL. — Holotype ( AMS C.355685).

Paratypes: from type locality ( AMS C.380464, BMNH 2000204 ) .

TYPE LOCALITY. — Australia, Michaelmas Cay , Great Barrier Reef , Queensland, 16°36’S, 145°59’E.

MATERIAL EXAMINED. — Koumac. 5 stn, 12-120 m, 21 v.

Lifou. 10 stn, 4-30 m, 34 v, 1 live.

DISTRIBUTION. — Known from Queensland, Australia, Papua New Guinea, Kiribati and New Caledonia but probably more widespread in the West Pacific ( Glover & Taylor 2001: 268).

DESCRIPTION

Shell small (H to 8 mm), white, robust, inflated, obliquely ovoid, slightly higher than long (H/L 1.1). Sculpture of fine radial ribs(>50) that are slightly more prominent in anterior of the shell, broader posteriorly. Radial ribs are crossed by thread-like, commarginal lamellae giving a reticulate ornament.Ribbing is often worn in the middle part of the shell. Lunule short, broad and slightly impressed. Hinge plate sinuous, with cardinal teeth located on downward projection. RV with single prominent cardinal tooth, a thin, elongate posterior lateral tooth and a short anterior lateral.LV with two cardinal teeth of which the anterior is larger. Posterior lateral tooth a thin ridge, anterior lateral indistinct. Ligament internal, short. Anterior adductor scar short, barely detached from the pallial line,posterior scar ovate.Pallial line sometimes divided. Shell margin finely and evenly crenulate.

Figures

FIG. 33. — Pillucina pacifica Glover & Taylor, 2001, Lifou, stn 1430, Loyalty Islands (MNHN): A, exterior of left valve; B, C, interior of left and right valves. Scale bars: 2 mm.

FIG. 34. — Outline drawings of interiors of right valves of Pillucina Pilsbry, 1921, Wallucina Iredale, 1930, Chavania Glover & Taylor, 2001 and Funafutia Glover & Taylor, 2001 species: A, W. fijiensis (Smith, 1885); B, C. striata (Tokunaga, 1906); C, P. pacifica Glover & Taylor, 2001; D, P. copiosa n. sp.; E, F. levukana (Smith, 1885). Not to scale.