Genus Terebratalia Beecher, 1893

Type species: Terebratula transversa Sowerby, 1846 (recent north-Pacific species).

Shells are smooth. Anterior commissure is straight (rectimarginate) or convex to pedal valve (sulcate). Deltidial plates are usually disjunct, rarely meet each other but never conjunct. Pedicle collar is short overhung; dental plates are weak. There are thickenings between margins of hinge-sockets and cardinal process. Descending branches of brachial loop have thin connection with median septum during all life of specimen.

Systematic of the genus is not studied well. There are two species in Russian waters of the Sea of Japan: Terebratalia coreanica and T. tisimana.

Key to species of the genus Terebratalia

1(2). Shells are gray (sometime rose-pink) without any traces of radial design  T. tisimana 

2(1). Shells are orange and red with intensive red fan-shaped radial rays T. coreanica