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the order of the dipnoi (order represented by forms still extant) was triggered by the extinct ceratodus, , which lived in the triassic (225-195 million of years ago), mesozoic era, living in freshwater, which was able, like present forms, to breath o2 from the air through its lungs, when the water was becoming poor of it.
l’ordre des dipnoi (ordre représenté par des formes actuellement encore vivantes), commence avec le ceratodus (disparu) qui a vécu dans le triasique (il y a 225-195 millions d’années).
