Each row consist of one central tooth and two lateral teeth.

The lateral teeth are higher and somewhat narrower at their base.

The 7-8 adjoining lateral teeth in half a row have equally small ectocones.

The left valve has two cardinal teeth flanked by one lateral tooth on each side.

Instead it has 5 or 6 lateral teeth lying on either side of the hinge.

The lateral tooth is rather large, straight, without a cusp.

The lateral teeth are small and are actually reduced to a rudimentary plate.

The odontophore has no large lateral tooth between the inner and outer series.

The number of lateral teeth varying from 24 to 28.

The species have a pair of lateral teeth that are located on each side.