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Dipnoi or lung fish form a subclass within the Sarcopterygii (lobe-finned fish). They are found in the fossil record from the Devonian to the present day. They are adapted to survive a seasonal drought. To do this, they possess a kind of lungs with which they can breathe, and they burrow into mud throughout the dry season. These adaptations became evident in the early evolutionary history of this group; one of the indications is the positioning of the nostrils in its fossil representatives.
Photos and locations for Dipnoi on this site
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