Abstract
A new species of leptodactylid frog, Physalaemus atlanticus, is described from Ubatuba, northern coast of S o Paulo in southeastern Brazil. The new species belongs to the Physalaemus signifer species group and is characterized by the following set of characters: small size (males 20.1 22.1 mm SVL, females 21.0 23.9 mm SVL); canthus rostralis distinct; dorsal skin texture smooth to slightly rugose; belly orange in life; advertisement call with duration of 0.6 0.84 s and frequency between 0.9 1.8 kHz. Descriptions of the advertisement call and tadpole are provided, as well as information on natural history.
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