A member of the class Dipnoi, which includes lungfish and related animals with two lungs and special evolutionary significance.
From Greek 'diplos' (double) and 'pneuma' (air), with '-an' (member suffix), naming the scientific class of double-lunged fishes.
Dipnoans are like the missing link between fish and tetrapods—they use actual lungs, have fleshy fin-like limbs, and some can walk on the ocean floor, making them evolutionary superstars.
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