<P> This timeline is based on studies from anthropology, paleontology, developmental biology, morphology, and from anatomical and genetic data . It does not address the origin of life, which discussion is provided by abiogenesis, but presents one possible line of evolutionary descent of species that eventually led to humans . </P> <P> One of several possible lines of descent, or taxonomic ranking, of Homo sapiens is shown below . </P> <Table> <Tr> <Th> Rank </Th> <Th> Name </Th> <Th> Common name </Th> <Th> Millions of years ago </Th> </Tr> <Tr> <Td> Domain </Td> <Td> Eukaryota </Td> <Td> Cells with a nucleus </Td> <Td> 2,100 </Td> </Tr> <Tr> <Td> Kingdom </Td> <Td> Animalia </Td> <Td> Animals </Td> <Td> 590 </Td> </Tr> <Tr> <Td> Phylum </Td> <Td> Chordata </Td> <Td> Chordates (Vertebrates and closely related invertebrates) </Td> <Td> 530 </Td> </Tr> <Tr> <Td> Subphylum </Td> <Td> Vertebrata </Td> <Td> Vertebrates </Td> <Td> 505 </Td> </Tr> <Tr> <Td> Superclass </Td> <Td> Tetrapoda </Td> <Td> Tetrapods (animals with four limbs) </Td> <Td> 395 </Td> </Tr> <Tr> <Td> (unranked clade) </Td> <Td> Amniota </Td> <Td> Amniotes (fully terrestrial tetrapods whose eggs are "equipped with an amnios") </Td> <Td> 340 </Td> </Tr> <Tr> <Td> Clade </Td> <Td> Synapsida </Td> <Td> Proto - Mammals </Td> <Td> 308 </Td> </Tr> <Tr> <Td> Class </Td> <Td> Mammalia </Td> <Td> Mammals </Td> <Td> 220 </Td> </Tr> <Tr> <Td> Subclass </Td> <Td> Theria </Td> <Td> Mammals that give birth to live young (i.e., non-egg - laying) </Td> <Td> 160 </Td> </Tr> <Tr> <Td> Infraclass </Td> <Td> Eutheria </Td> <Td> Placental mammals (i.e., non-marsupials) </Td> <Td> 125 </Td> </Tr> <Tr> <Td> Magnorder </Td> <Td> Boreoeutheria </Td> <Td> Supraprimates, (most) hoofed mammals, (most) carnivorous mammals, whales, and bats </Td> <Td> 124--101 </Td> </Tr> <Tr> <Td> Superorder </Td> <Td> Euarchontoglires </Td> <Td> Supraprimates: primates, colugos, tree shrews, rodents, and rabbits </Td> <Td> 100 </Td> </Tr> <Tr> <Td> Grandorder </Td> <Td> Euarchonta </Td> <Td> Primates, colugos, and tree shrews </Td> <Td> 99--80 </Td> </Tr> <Tr> <Td> Mirorder </Td> <Td> Primatomorpha </Td> <Td> Primates and colugos </Td> <Td> 79.6 </Td> </Tr> <Tr> <Td> Order </Td> <Td> Primates </Td> <Td> Primates </Td> <Td> 75 </Td> </Tr> <Tr> <Td> Suborder </Td> <Td> Haplorrhini </Td> <Td> "Dry - nosed" (literally, "simple - nosed") primates: apes, monkeys, and tarsiers </Td> <Td> 63 </Td> </Tr> <Tr> <Td> Infraorder </Td> <Td> Simiiformes </Td> <Td> "Higher" primates (Simians): apes and monkeys </Td> <Td> 40 </Td> </Tr> <Tr> <Td> Parvorder </Td> <Td> Catarrhini </Td> <Td> "Downward - nosed" primates: apes and old - world monkeys </Td> <Td> 30 </Td> </Tr> <Tr> <Td> Superfamily </Td> <Td> Hominoidea </Td> <Td> Apes: great apes and lesser apes (gibbons) </Td> <Td> 28 </Td> </Tr> <Tr> <Td> Family </Td> <Td> Hominidae </Td> <Td> Great apes: humans, chimpanzees, gorillas, and orangutans--the hominids </Td> <Td> 15--20 </Td> </Tr> <Tr> <Td> Subfamily </Td> <Td> Homininae </Td> <Td> Humans, chimpanzees, and gorillas (the African apes) </Td> <Td> 12--14 </Td> </Tr> <Tr> <Td> Tribe </Td> <Td> Hominini </Td> <Td> Includes both Homo, Pan (chimpanzees), but not Gorilla . </Td> <Td> 8--10 </Td> </Tr> <Tr> <Td> Subtribe </Td> <Td> Hominina </Td> <Td> Genus Homo and close human relatives and ancestors after splitting from Pan--the hominins </Td> <Td> 4--8 </Td> </Tr> <Tr> <Td> Genus </Td> <Td> Homo </Td> <Td> Humans </Td> <Td> 2.5 </Td> </Tr> <Tr> <Td> Species </Td> <Td> Homo sapiens </Td> <Td> Anatomically modern humans </Td> <Td> 0.8--0.3 </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Name </Th> <Th> Common name </Th> <Th> Millions of years ago </Th> </Tr>

When did anatomically recognizable humans appear on earth
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