Tristichopterids were a diverse and successful group of fish-like tetrapodomorphs living throughout the Middle and Late Devonian. They first appeared in the Eifelian stage of the Middle Devonian. With
Comparisons of the skulls of three members of the Tristichopteridae: A, B, C, Edenopteron; D, Eusthenodon, E. Cabonnichthys; F, Mandageria.