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A new species of Osteocephalus from Ecuador and a redescription of O. leprieurii (Duméril & Bibron, 1841) (Anura: Hylidae)

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The South American spiny-backed treefrog, Osteocephalus leprieurii, as previously understood, is a composite of several species. We redescribe it morphologically on the basis of specimens from French Guiana and add other data on the biology of the species. We describe O. mutabor n. sp., previously confused with O. leprieurii, from the Amazon Basin of Ecuador. The two species differ in coloration, vocalizations and ontogenetic colour change. Osteocephalus leprieurii is remarkable for bearing nuptial excrescences not only on the thumb, but also under the fingers and on the chin. The vocal sac is semicircular expanding posterolaterally. Osteocephalus mutabor n. sp. is characterized by numerous dark transversal bars on the dorsum and a semicircular vocal sac. The amount of keratinized tips on the dorsal granules in males of both species is dependent on sexual activity.

Bajo el nombre de la rana arborícola de espalda espinosa Osteocephalus leprieurii, de Sur America, como se ha entendido anteriormente, se confundieron diferentes especies. Se describe de nuevo la especie morfológicamente en base a especimenes de la Guayana Francesa y se añaden otros datos sobre su biología. Describimos O. mutabor n. sp. de la Cuenca Amazónica Ecuatoriana. Ambas especies se diferencian en coloración, vocalizaciones y cambio ontogenético de color. Osteocephalus leprieurii se caracteriza por poseer excrecencias nupciales no solo en el pulgar, sino también bajo los dedos y la barbilla. El saco vocal es semicircular con expansión posterolateral. Osteocephalus mutabor n. sp. se caracteriza por tener rayas oscuras transversales en el dorso y un saco vocal semicircular. La cantidad de puntas queratinizadas en los gránulos dorsales de los machos de ambas especies depende de la actividad sexual.


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