The Dipterus was a lungfish that developed at this time. In many ways it looked like the lobe-fins with bony flesh at the base of its fins. But the Dipterus had lung sacks branching off of its throat that got air from the gills. During the Devonian Period, there were huge swings of floods and drought. During drought times, when lakes turned into ponds, the plants used all the oxygen in the little water that remained. A Dipterus that was stranded in such a pool could stick its head out of the water and get the air it needed to stay alive.
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