How do lemurs differ from other monkeys?

The other suborder is Haplorhini, the “dry-nosed” primates which includes monkeys and apes. So this would be the most prominent difference. Other than that (among other things) lemurs have smaller brains and better noses. read more

While monkeys in Africa and Asia (and later South America, apparently thanks to a similar but altogether more impressive rafting incident) typically stayed in the same sort of ecological niche, at least until the apes emerged, lemurs in Madagascar evolved to fill roles which could be compared to very different species elsewhere. The mouse lemurs, for example, are smaller than any other primate, and as their name implies, resemble mice as much as they do monkeys. read more