Rhadinosteus parvus is a small anuran whose diagnosis is based on several partial skeletons and some isolated bones representing metamorphic to newly transformed ontogenetic stages from the Late Jurassic Morrison Formation at the Rainbow Park Microsite, Utah. This frog is a member of the Pipoidea on the basis of an azygous frontoparietal and parasphenoid that lacks lateral alae and is an important addition to the poorly known Jurassic frog fauna. Although other members of the Pipoidea have skeletal specializations for burrowing or swimming, Rhadinosteus possesses an unspecialized skeleton. Presence of ectochordal vertebrae suggest that Rhadinosteus is a member of the Rhinophrynidae, and if so, it is the most primitive member known. Being from the Late Jurassic, Rhadinosteus predates both the previous pipoid, Early Cretaceous, and rhinophrynid, Late Paleocene, records.
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