Famous for the Satpura Hypothesis, a zoo-geographical hypothesis proposed by him that suggests that the central Indian Satpura Range of hills acted as a bridge providing for the Malayan affinity of many Indian fauna and flora in the peninsula and the Western Ghats of India. He used the adaptations of torrent fishes to support this biogeographical hypothesis, however new research suggests that the examples he used were a case of convergent evolution.
A genus of ricefish, Horaichthys ("Hora's Fish"), the sole member of the family Horaichthyidae are named after him.
^Karanth, Praveen. 2003. Evolution of disjunct distributions among wet-zone species of the Indian subcontinent: Testing various hypotheses using a phylogenetic approach. Current Science 85(9):1276-1282 PDF[dead link]