 In 2006 , the Bornean slow loris was elevated to the species level ( as Nycticebus menagensis ) based on molecular analysis of DNA sequences of the D @-@ loop and the cytochrome b gene . In 2008 , Groves and Ibnu <unk> confirmed the promotion of the fifth species , the Javan slow loris , to species status , a move that had been suggested in previous studies from 2000 . They based their decision on an analysis of cranial morphology and characteristics of pelage . Species differentiation was based largely on differences in morphology , such as size , fur color , and head markings . 
