 The uncontroversial, core asian members of the genus most closely related to the type "S. sivalensis" were widespread throughout the Late Neogene and Quaternary of South and Southeast Asia, with the oldest records coming from the Late Miocene Siwaliks.They were extinct by the Late Middle Pleistocene in Southeast Asia, but survived in India until the terminal Pleistocene, with the latest dates being around 16,467–15,660 cal BP.The genus "Hexaprotodon" also includes a number of rarely studied extinct species from Asia.