Eosuchia was initially defined to include all "thecodontian" reptiles which did not have an antorbital fenestra but did retain tabulars, postparietals and a large pineal foramen (Broom, 1914).
Eosuchia foi inicialmente definido para incluír todos os réptiles "tecodontos" que non tiñan fiestra anteorbital, pero posuían tabulares, postparietais e grandes forames pineais (Broom, 1914).