[1][3] Like some other Strophomenids, Lepteana were epifaunal, meaning they lived on top of the seafloor, not buried within it, and were suspension feeders.

Leptaena have a concavo-convex profile, and are sometimes Semiquadrate to semielliptical.

The Cardinal Process is split in two and the hinge line is straight.

Leptaena fossils have been found on every continent except Antarctica.

[3][5][6] Leptaena was a diverse genus, with over 70 recognized species and subgenera.