The adapiforms are early primates which are known only from the fossil record, and it is unclear whether they form a monophyletic or a paraphyletic grouping. They are usually grouped under Strepsirrhini—including lemurs, aye-ayes and lorisoids—and as such would not be ancestral to Haplorrhini, which includes tarsiers and simians.Callum Ross, Richard F. Kay, Anthropoid origins: new visions, Springer, 2004, , p. 100 Simians are usually called "anthropoid": while this term can be confusing, the paper uses it, as does associated publicity material. Simians (anthropoids) include monkeys and apes, which in turn includes humans.
