Valves linear-elliptic, elliptic, or lanceolate, with rounded or slightly protracted apices.
Raphe valve concave, rapheless valve convex.
Mantle with a row of pores, with convex occlusions internally.
Striae biseriate. Areolae round, occluded internally by hymenes.
Raphe valve with stauros-like asymmetrical fascia.
Raphe straight with expanded teardrop-shaped central ends, internally slightly deflected in opposite directions; terminal raphe fissures deflected in opposite directions.