Abstract
Ponohydrochus buryaticus gen. et sp. nov. is described from the Khasurty fossil site, Lower Cretaceous, Hauterivian, at the Buryatia Republic, Russia. The new taxon is assigned to the family Hydrochidae and represents its first remarkable fossil in the Mesozoic. The description is illustrated by photographs, scanning electron micrographs and line drawings. The genus Cretohelophorus Ponomarenko, considered as possibly representing the Hydrochidae by some recent authors, is for the moment excluded from the family; detailed studies of both its species are needed to reveal its family placement.
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