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When did the extinct Pleurocanthodii live?
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chondrichthyan
Southern stingrays (Dasyatis americana or Hypanus americanus) are found in the western Atlantic Ocean.
The extinct order Pleurocanthodii, which consisted of freshwater sharklike fishes, first appeared in the Late Devonian period, approximately 380 million years ago. These fishes were particularly abundant during the Carboniferous and Early Permian periodsāan interval spanning from 360 million to about 270 million years agoābefore ultimately disappearing during the Triassic Period.1