Ungulates
The three humanoid ungulate species share recent evolutionary history, indicated by their similarities in form. Most differences are a result of brief1 stints in distinct environments: mountains and their shadowing deserts for fauns, plains for ipotanes, and forests for satyrs.
Other than physiological similarities, though, seirims have little that is universal amongst them. Their cultures are all vastly different, in fact, the humanoids with the most similar cultures are satyrs and humans- not two ungulates at all.