Physalaemus insperatus is a species of frog in the family Leptodactylidae. It is endemic to southern Brazil and is only known from its type locality, Serra da Pedra Branca do Araraquara in Guaratuba, Paraná. The specific name insperatus means "unexpected" or "surprising" in Latin and alludes to the fortuitous finding of a new species among old museum specimens, originally identified as Physalaemus olfersii; taxonomically, it is part of the so-called Physalameus olfersii species group.

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