Platyxanthus is a genus of crabs in the family Platyxanthidae, containing the following species: Platyxanthus balboai Garth, 1940 Platyxanthus crenulatus A. Milne-Edwards, 1879 Platyxanthus orbignyi (H. Milne Edwards & Lucas, 1843) Platyxanthus patagonicus A. Milne-Edwards, 1879

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