equus first appeared in fossil record in  42 ma.
when did equus first appear in fossil record?
~ 42 ma
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na
snakes do not have an extensive fossil record; the oldest known fossil is from between early and late cretaceous period. there were tertiary fossil snakes that became extinct by the end of the eocene period. the first colubrid also appeared in the eocene period. lizards first appeared in the middle jurassic period, and this is when the scincomorph and the anguimorph lizards were first seen. the gekkotans first appear in the late jurassic period and the iguanians first appear in the late cretaceous period. the lizards of the cretaceous period represent extinct genera and species. the majority of amphisbaenians first appeared during the early cenozoic period. rhynchocephalian fossils first appear in the middle triassic period, between 238-240 million years ago, making them the earliest lepidosaurian fossils found to date. the tuatara can now only be found on small islands off the new zealand coast. however, fossil records show that it once lived on mainland new zealand and rhynchocephalia as a whole was once distributed globally.
lepidosauria