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Parapsephurus is an extinct genus of paddlefish in the family Polyodontidae. Currently the only known species in this genus is the type species, Parapsephurus willybemisi. P. willybemisi is known a nearly complete specimen from the Tanis locality of the Hell Creek Formation in North Dakota, USA, which dates to the late Maastrichtian stage of the Late Cretaceous, approximately 66 million years ago.
The name Parapsephurus refers to the similarities between the short gill arches of this genus and the more recently extinct paddlefish Psephurus, also known as the Chinese paddlefish. The type species, P. willybemisi, is named in honor of William E. Bemis, a professor of ecology and evolutionary biology and curator of fishes at Cornell University, who has conducted extensive research on paddlefish.
The rostrum of the holotype specimen is around in length, with a total body length of around . The species is placed in the clade Polyodonti, which includes all polyodontids other than the most primitive genus Protopsephurus. Like Psephurus and other extinct paddlefish genera, the genus was likely piscivorous, feeding on fish, rather than planktivorous like Polyodon.
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