Radiolucina Britton, 1972

Garfinkle, Elizabeth A. R., 2012, A review of North American Recent Radiolucina (Bivalvia, Lucinidae) with the description of a new species, ZooKeys 205, pp. 19-31 : 21

Genus Radiolucina Britton, 1972

Radiolucina Britton, 1972. Type species (original designation): Phacoides (Bellucina) amiantus Dall, 1901.

Description.

Shell shape subovate; maximum length: 9.0 mm, maximum height: 8.0 mm; with an average of 13 heavy radial ribs, overlain by thin commarginal lamellae that continue through interspaces, producing a reticulate pattern; posterior end thickened, posterior dorsal area often with low spines; pallial line often discontinuous broken into large and small segments; right valve hinge with two cardinal teeth, left valve hinge with one wide cardinal tooth, one anterior lateral tooth, one posterior lateral tooth.

Comparisons.

Parvilucina Dall, 1901 (type species: Lucina tenuisculpta P.P. Carpenter, 1864) attains a larger size and has fine radial ribs, and a short, broad anterior adductor muscle scars compared to Radiolucina , which has strong radial ribs and a long, narrow anterior adductor muscle scar.

Pleurolucina Dall, 1901 (type species: Lucina leucocyma Dall, 1886) has heavy commarginal lamellae with few broad, weak radial ribs compared to Radiolucina . It is similar to Radiolucina in that they both have a long, narrow anterior adductor muscle scar.

Liralucina Glover & Taylor, 2007 (type species: Phacoides sperabilis Hedley, 1909) has an average of 35 flat, radial ribs compared to Radiolucina ,which has average 13 strong, radial ribs.

There is evidence ( Coan and Valentich-Scott 2012) that Radiolucina dates back to the Miocene.

Literature.

Britton (1972), Hickman (1994), Taylor and Glover (2000), Glover and Taylor (2007), Taylor and Glover (2009), Coan and Valentich-Scott (2012).