Pusillolucina denticula (Glover & Taylor, 2001)

Taylor, John D. & Glover, Emily A., 2019, Unloved, paraphyletic or misplaced: new genera and species of small to minute lucinid bivalves and their relationships (Bivalvia, Lucinidae), ZooKeys 899, pp. 109-140 : 109

Pusillolucina denticula (Glover & Taylor, 2001) Figs 8 G–K

Pillucina denticula Glover & Taylor, 2001: 271, figs 7 a-g.

Type material.

Holotype: NMSA B310/T1758, L 3.5 mm; Paratypes: NMSA V8402/T1759, L 2.9 mm, 2.8 mm, 3.1 mm, NHMUK 20000377, L 3.5 mm.

Type locality.

Durban Bay, South Africa.

Description.

Shells small, L to 3.5 mm, robust, sub-circular to ovoid in outline. Sculpture of fine, closely spaced, commarginal lamellae crossed by low, rounded radial ribs that are prominent and broader towards anterior and posterior. Ribs inconspicuous in central part of shell. Lunule long, lanceolate. Ligament internal, short. Right valve with a single cardinal tooth, a prominent anterior lateral tooth and a long posterior lateral tooth divided into 8-10 small cusps. Left valve with two cardinal teeth, a small anterior lateral and a posterior tooth divided into sockets for cusps of the RV. Anterior adductor muscle scar short and barely detached from the pallial line. Inner shell margin crenulate, with crenulations more widely spaced anteriorly.

Figures

Figure 8. Pusillolucina pusilla and P. denticula. A-D Pusillolucina pusilla (Glover & Taylor, 2016) A Pillucina pusilla Holotype (MNHN IM- 2000 - 26591) Philippines, Bohol Island, L 1.2 mm B holotype dorsal view C, D P. pusilla interior of left and right valves, paratype (MNHN IM- 2000 - 26592), L 1.05 mm E, F detail of hinge teeth in C, D. G-K Pusillolucina denticula (Glover & Taylor, 2001) Durban Bay, South Africa G exterior of right valve, paratype (NMSA), L 2.9 mm H, I interior of left and right valves, holotype (NMSA), L 3.5 mm J, K detail of hinge teeth.