Mumwe unhu hwakadaro inowanika paleontology, vakagoverana vose vanorarama mammals (kusanganisira monotremes), asi kwete aripo chero mangwanani Triassic therapsids, kunoratidzwa Figure 1 (kurudyi), kureva: mammals kushandisa mapfupa maviri kunzwa kuti vamwe amniotes zvose kushandisa kudya. The earliest amniotes aiva muchibata pamwe kunosanganisira articular (mumwe muduku pfupa kumashure muzhenje pazasi) uye quadrate (mumwe muduku pfupa kumashure muzhenje rokumusoro). All non-mammalian tetrapods kushandisa hurongwa ichi kusanganisira amphibians, turtles, tsuro, nyoka, crocodilians, dinosaurs (kusanganisira ichthyosaurs, pterosaurs uye therapsids). Asi mammals vane zvakasiyana muchibata, pamwe chete chete chete nechepasi muchibata mapfupa (the Triassic therapsids), asi kwete varipo chero ari mangwanani Triassic theraps, kunoratidzwa Figure 1 (kurudyi), kureva: mammals kushandisa mapfupa maviri kuti kunzwa kuti vamwe amniotes zvose amniotes vanoshandisa kudya.
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