Acoustical repertoires and morphological differences in the ear of two Alsodes species (Amphibia: Leptodactylidae)

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Abstract
Vocalizations, the sound-conducting apparatus, and acoustical receptors of the inner ear in two species of the anuran genus Alsodes are described. Alsodes nodosus emits a mating call and has a complete middle ear. Alsodes tumultuosus has a weak vocalization that is apparently not involved in mate attraction. This species lacks a tympanic ring and columella. Inner ear receptors are similar in their gross morphology in both species. Anatomical differences in sound-conducting structures may determine interspecific differences in auditory function corresponding with signal divergence.

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