Paucicrura navis (Öpik, 1930)

Shell of moderate size, unequally biconvex with pedicle valve more than four-fifths as long as wide. Dorsal interior with thin plate-like basically divergent brachiophores, with strong socket plates. Cardinal process with median crest reaching above the hinge-line. Radial ornamentation consisting of angular costellae with endopunctae, varying from 6 to 8 per 2 mm, at 5 mm anterior of dorsal umbo.