Peritresius is an extinct genus of sea turtle from the Late Cretaceous deposits in the US Eastern Seaboard.

Two species are known, Peritresius ornatus Leidy, 1856 and P. martini Gentry, Parham, Ehret, and Ebersole, 2018, both from Campanian-Maastrichtian age deposits in New Jersey, Alabama, and Mississippi.

[1][2] Peritresius in a cladogram from the analysis of Gentry et al., 2019:[3] †Angolachelonia †Protostegidae †Toxochelys latiremis Chelonioidea †Asmodochelys parhami †Prionochelys matutina †Ctenochelys acris †Ctenochelys stenoporus †Peritresius ornatus †Peritresius martini

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