 Slow lorises are a group of several species of nocturnal strepsirrhine primates which make up the genus Nycticebus . Found in Southeast Asia and bordering areas , they range from Bangladesh and Northeast India in the west to the Sulu Archipelago in the Philippines in the east , and from Yunnan province in China in the north to the island of Java in the south . Although many previous classifications recognized as few as a single all @-@ inclusive species , there are now at least eight that are considered valid : the Sunda slow loris ( N. coucang ) , Bengal slow loris ( N. bengalensis ) , pygmy slow loris ( N. pygmaeus ) , Javan slow loris ( N. javanicus ) , Philippine slow loris ( N. menagensis ) , Bangka slow loris ( N. bancanus ) , Bornean slow loris ( N. borneanus ) , and Kayan River slow loris ( N. kayan ) . The group 's closest relatives are the slender lorises of southern India and Sri Lanka . Their next closest relatives are the African lorisids , the pottos , false pottos , and angwantibos . They are less closely related to the remaining lorisoids ( the various types of galago ) , and more distantly to the lemurs of Madagascar . Their evolutionary history is uncertain since their fossil record is patchy and molecular clock studies have given inconsistent results . 
