Phasmahyla cruzi is a species of frog in the subfamily Phyllomedusinae. It is endemic to Brazil and solely known from the vicinity of its type locality, Rio das Pedras Reserve in the municipality of Mangaratiba, Rio de Janeiro state. The range extends into the adjacent Paraty municipality. This species is named for Carlos Alberto Gonçalves da Cruz, Brazilian herpetologist. The common name Mangaratiba tree frog has been proposed for it.

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