Triquetrorhabdulus extensus Theodoridis, 1984
Description: One lateral blade very wide, with weak ridges.
Remarks: This form is very similar to some specimens of T. striatus in shape, and has weak lateral ridges (Theodoridis 1984 pl. 11/1), it may not be worth differentiating the two species.
Range: NN11B-12.
Neogene: Triquetrorhabdulus extensus