This species is divided into a number of
subspecies:
H. a. amboinensis (Peters, 1871) from Ambon,
H. a. antricola (Peters, 1861) in the Philippines (including Palawan),
H. a. ater from Sri Lanka and India,
H. a. aruensis Gray, 1858 from the Aru Islands and New Guinea,
H. a. gilberti from Australia,
H. a. nicobarulae in the
Nicobar Islands and
H. a. saevus from the area between South-
Thailand and the
Moluccas. Instances from
Borneo cannot be assigned to a particular subspecies, although
H. a. antricola en
H. a. saevus appear to have a slightly longer skull. They would be classified in the same way that
H. a. ater en
H. a. antricola sometimes have reduced teeth. However, there are only four known instances from Borneo, only one of which is undamaged. == Description ==