Keasius is an extinct genus of basking sharks that lived during the Cenozoic. It contains four valid species, which have been found in North America, Europe, and Antarctica.
Palaeobiology A 2026 study analyzed a regurgitalite produced by either a lamniform or a hexanchid shark which contained remains attibuted to K. cf. septemtrionalis from the Miocene (Burdigalian) of Slovenia, extending it's known range to the southeastern central paratethys ocean.
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