A primate (from Latin primat-, from primus 'prime, first rank') is a eutherianmammal constituting the taxonomicorder Primates (/praɪˈmeɪtiːz/). Primates are sister to Dermoptera (flying lemurs or colugos), together forming the Primatomorpha. It consists of the otherwise extinct plesiadapiformes and its descendents, the lemurs (strepsirrhini, lemuriformes), the haplorrhini (tarsiers and monkeys, including apes). With the crown-primates (euprimates) cladistically included in the plesiadapiformes, it becomes a junior synonym for primates, then sometimes referred to as pan-primates.