Scabrilucina, Taylor, John D. & Glover, Emily A., 2013

Taylor, John D. & Glover, Emily A., 2013, New lucinid bivalves from shallow and deeper water of the Indian and West Pacific Oceans (Mollusca, Bivalvia, Lucinidae), ZooKeys 326, pp. 69-90 : 70-71

Scabrilucina gen. n.

Type species.

Cryptodon victorialis Melvill, 1899. Here designated. Northern Indian Ocean.

Diagnosis.

Small to medium size, L to 40 mm, thin, semi-translucent, usually slightly higher than long, ovoid to subtrigonal, strong posterior sulcus with broad sinus at posterior margin. Sculpture of sharp, fine, commarginal lamellae. Ligament short, set in shallow resilifer. Hinge with small to vestigial cardinal teeth in both valves, lateral teeth usually absent but small anterior lateral tooth may be present in juvenile shells. Anterior adductor muscle scar long, thin, ventrally detached from pallial line for ½–¾ of length, dorsal part runs on to hinge. Interior shell with translucent spots.

Etymology.

Derivedfrom Latin scaber rough and Lucina , reference to the rough surface formed by closely spaced, sharp, commarginal lamellae. Feminine.

Comparison with other genera.

Scabrilucina can be readily distinguished from other lucinids by the subtrigonal outline with a prominent posterior sulcus, the fine, regular, sharp-edged, commarginal lamellae and the absence of radial sculpture. No preserved samples of Scabrilucina were available for molecular analysis but a small lucinid from the Philippines with some similar characters was included in a prior analysis ( Taylor et al. 2011) as ' Lucina ' desiderata Smith, 1885. We now consider this a new species in a separate genus ( Glover and Taylor in press) and related to Scabrilucina . Evidence from 18 S and 28 S rRNA genes places ' Lucina ' desiderata in the subfamily Lucininae that by inference also includes Scabrilucina .

The little known genus Semelilucina Cosel & Bouchet, 2008, type species Semelilucina semeliformis from offshore muddy habitats in Tanimbar, SE Indonesia, may be related to Scabrilucina . The two genera differ in shell shape but have similar sculpture of fine, regularly spaced, sharp commarginal lamellae. Cosel and Bouchet 2008 considered Semelilucina closely related to Dulcina ( Leucosphaerinae ) and we followed this in our classification ( Taylor et al. 2011). However, shell morphology suggests that Semelilucina is better placed in the Lucininae .