Pusillolucina africana, Taylor, John D. & Glover, Emily A., 2019

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 africana sp. nov. Fig. 11

Type material.

Holotype: MNHN-IM-2000-35107, sh, L 2.3 mm; Paratypes: 10 v, L 1.9-2.2 mm MNHN-IM-2000-35108, 3 v NHMUK 20191083.

Type locality.

Mozambique, Inhaca Island, Baia Campessuane, 3-4 m, INHACA stn MD1, 26°03.6'S, 32°56.6'E. 25NOV2011.

Etymology.

Named for Africa, used as an adjective.

Diagnosis.

Pusillolucina with posterior lateral teeth divided into seven or eight cusps and sockets.

Description.

Shell very small, L to 2.4 mm, ovate, umbones prominent, sculpture of closely spaced, narrow, commarginal lamellae, sometimes slightly elevated at posterior and anterior dorsal margins, crossed at anterior and posterior by low radial ribs, juvenile shells with commarginal lamellae only. Protoconch: P1 ca 75 µm, P1 + P2 = 140 µm, P2 with numerous growth increments. Lunule long, broadly lanceolate, smooth. Ligament internal, short, set on triangular resilifer alongside cardinal teeth. Hinge: right valve with single cardinal tooth, anterior lateral tooth located above anterior adductor muscle. Posterior lateral tooth long, divided into seven or eight cusps, left valve with two cardinal teeth, the anterior larger, anterior lateral tooth small, posterior lateral tooth with seven or eight sockets for cusps of right valve. Anterior adductor muscle scar short, barely detached from pallial line, posterior scar ovoid. Pallial line continuous. Inner shell margin crenulate, more strongly to anterior.

Remarks.

For comparison with other species see P. arabica above.

Figures

Figure 11. Pusillolucina africana sp. nov. Mozambique, Inhaca Island, Baia Campessuane, 3 - 4 m, INHACA stn MD 1. B-O Paratypes (MNHN-IM- 2000 - 35108). A Holotype (MNHN-IM- 2000 - 35107), L 2.3 mm B paratype exterior left valve, L 2.1 mm C interior of left valve, L 2.1 mm D interior right valve, L 1.9 mm E exterior right valve, L 2.2 mm F exterior left valve, L 2.2 mm G exterior of left valve, L 2.2 mm H dorsal view, L 2.4 mm I interior of left valve, L 2.1 mm J interior of right valve, L 2.1 mm K interior of right valve, L 2.1 mm L-N detail of hinges of I, J, K. O Protoconch. Scale bar: 50 µm (O).