Lorisidae is a group of strepsirrhines that comprises the Asian lorises, the African pottos (including angwantibos) and their closest fossil relatives. As a group, extant lorisids are not very speciose, with 15 species currently identified (10 species of loris and 5 of potto; see 2015). The biogeographic and phylogenetic contexts of the evolutionary origin of lorisids have long been a matter of debate, without any clear resolution (Pickford, 2012). The main reason why there are only slow improvements in this research area is because lorises are rare in the African and Asian fossil record. Only seven species have been named (Table 3.1), suggesting that either lorisids have been a poorly diverse group throughout their evolutionary history, or that there is a hidden lorisid diversity yet to be uncovered beneath the forests of continental Africa and South and South-east Asia.