Notomyrtea vincentia, Glover & Taylor, 2007

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 : 118-120

Notomyrtea vincentia n. sp.

( Figs 5 ; 6A )

TYPE MATERIAL. — Holotype: 1 sh, L 9.4 mm, H 7.7 mm, T 2.0 mm ( MNHN).

Paratypes: New Caledonia, Touho , stn 1249, 20°49’S, 165°19’E, 80-140 m, 1 sh, L 6.5 mm, H 5.3 mm ; 7 v, L 13.4 mm, H 11.0 mm; L 12.9 mm, H 10.9 mm, rest damaged ( MNHN). — New Caledonia, east coast, stn DW 665, 20°57’S, 165°35’E, 180-200 m, 1 v, L 12.2 mm, H 10.0 mm ( MNHN) .

TYPE LOCALITY. — New Caledonia, Baie de St Vincent, stn 190, 22°02’S, 165°57’E, 135- 150 m.

ETYMOLOGY. — Vincentia , from the type locality of Baie de St Vincent.

DESCRIPTION

Shell small, H to 7.7 mm, L to 9.4 mm, ovate to subtrigonal, longer than high (H/L 0.82), posterior margin slightly truncate, anterior margin rounded, shell not inflated, umbones prominent. Protoconch smooth 170 µm, PI large, PII narrow. Periostracum light brown, anterior and ventral margins with red staining. Sculpture of regularly spaced, thin, commarginal lamellae, more elevated and closely spaced along antero- and posterodorsal margins. Interspaces with irregular, radial threads ( Fig. 5F ). Lunule, long, lanceolate, shallow, smooth, symmetrical. Ligament short, external. Hinge narrow, RV with single cardinal tooth and a distant elongate anterior lateral tooth, and a small posterior lateral. LV with two small cardinal teeth, anterior and posterior lateral teeth indistinct. Anterior adductor scar short, broad, tapers ventrally, detached from pallial line for 1/3 of length. Posterior scar short, reniform. Pallial line entire. Shell interior glossy, shell margin smooth.

REMARKS

This species is similar to Notomyrtea botanica (Hedley, 1918) from Eastern Australia but has fewer, more elevated, commarginal lamellae.

Figures

FIG. 5. — Notomyrtea vincentia n. sp., holotype (MNHN), Baie de St Vincent, New Caledonia (MNHN): A, B, exterior of right and left valves; C, protoconch; D, E, interior of right and left valves; F, detail of sculpture; G, H, detail of hinges of left and right valves. Scale bars: A, B, D, E, 5 mm; C, 75 µm; F, 1 mm; G, H, 2 mm.

FIG. 6. — Outline drawings of interiors of right valves: A, Notomyrtea vincentia n. sp.; B, Myrtina porcata n. gen., n. sp.; C, M. leptolira n. gen., n. sp.; D, Poumea coselia n. gen., n. sp.; E, Solelucina koumacia n. gen., n. sp. Not to scale.