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Keasius

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.

Description
In terms of size, Keasius individuals were considerably smaller than extant basking sharks, with estimated total lengths around m based on gill raker-body proportions, versus the up to maximum for basking shark(C. maximus). == Paleobiology ==
Paleobiology
Keasius species were specialized planktivores that employed a filter-feeding mechanism analogous to that of the modern basking shark Cetorhinus maximus. Fossilized gill rakers, teeth, and vertebral centra reveal a passive filtration system, where individuals swam with their mouths agape to draw in water via ram ventilation, straining zooplankton and small nektonic organisms from the water column. The close spacing and reduced size of teeth in preserved dentition further supported retention of minute prey particles while expelling excess water through the gills, as evidenced by specimens from Oligocene deposits in Germany. ==References==
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