Panina | |
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A malechimpanzee (left) and a malebonobo (right) | |
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Phylogeny of Panina including the ghost lineage andSahelanthropus. | |
Scientific classification![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Primates |
Suborder: | Haplorhini |
Infraorder: | Simiiformes |
Family: | Hominidae |
Subfamily: | Homininae |
Tribe: | Hominini |
Subtribe: | Panina Delson, 1977[1] |
Type genus | |
Pan Blumenbach, 1775 | |
Genera | |
Panina[2] is asubtribe of tribeHominini; it comprises all descendants of thehuman-chimpanzee last common ancestor (LCA) that arenot of the branch ofhumanlineage—that is, all those ancestors of the typegenusPan (chimpanzees andbonobos).[3][1] This split/divergence occurred around 8 to 6 million years ago (mya),[4] which compares with a range of other estimates for this event—likely extended by periods of hybridization—of from 15 to 3 mya.[5][6] Fossils from this subtribe are typically rare because they tend to live in environments with poor fossilization. Some of the earliest chimpanzee fossils are 500,000 years of age.[7]
Panina is one of two subtribes of tribe Hominini; the other isAustralopithecina (or Hominina). ThegenusSahelanthropus lived around the time of the divergence, and may have then been found among one of these groups: a member of either branch of lineage; a precursor to both lineages; or possibly an early member of tribeGorillini, which previously had split from the human-chimpanzee lineage. Regardless, the morphology ofS. tchadensis supports the theory that,at and after the divergence, hominins then areunlikely to resemble in appearance(s) with any number of derived characters of their descendants.[8][9] A genetic study conducted in 2010 surveyed chimpanzeemitochondrial genomes and discovered the presence of an extinctghost lineage, (i.e., fossil evidence doesn't exist yet) of Panina that diverged around 3.3 mya and began interbreeding with bonobos (Pan paniscus), who then interbred with chimpanzees (Pan troglodytes). This signature is carried more heavily inP. troglodytes despite having interbred with bonobos first, seeing as how they occupy a greater range.[10]