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We describe a new species of Eleutherodactylus (subgenus Syrrhophus) from Guerrero, Mexico, based on morphological and molecular data, as well as advertisement call analysis. Eleutherodactylus franzi sp. nov. has unique features including widely expanded fingertips, indistinct, but visible lumbo-inguinal glands, an immaculate white venter and dark reticulations on a cream dorsal background colouration. The new species belongs to the Eleutherodactylus nitidus species group. Eleutherodactylus franzi sp. nov. is micro-endemic, restricted to a small range in karstic hillsides on the southern extreme of the Mexican Transverse Ranges. We discuss conservation needs of this species, which we provisionally classify as Critically Endangered.