 The evolutionary relationships of the hardnose shark have not been fully resolved.In a 1988 study based on morphology, Leonard Compagno tentatively grouped the hardnose shark with the Borneo shark ("C. borneensis"), whitecheek shark ("C. dussumieri"), Pondicherry shark ("C. hemiodon"), creek whaler ("C. fitzroyensis"), smalltail shark ("C. porosus"), blackspot shark ("C. sealei"), and spottail shark ("C. sorrah").Results from molecular phylogenetic analyses have been inconsistent, with some supporting parts of Compagno's hypothesis