The skull remained unstudied until 1956 when Francis Fraser examined it and concluded that it was similar to species in both the genera Lagenorhynchus and Delphinus but not the same as either.
O cranio permaneceu sen investigar até 1956, cando Francis Fraser o examinou e concluíu que era similar aos das especie dos xéneros Lagenorhynchus e Delphinus pero que non pertencía a ningunha delas.