Monday, February 25, 2019

[Herpetology • 2019] Charadrahyla sakbah • A New Species of Charadrahyla (Anura: Hylidae) from the Cloud Forest of western Oaxaca, Mexico


Charadrahyla sakbah
Jiménez-Arcos, Calzada-Arciniega, Alfaro-Juantorena, Vázquez-Reyes, Blair & Parra-Olea, 2019


Abstract
A new species of treefrog from the genus Charadrahyla is described from the cloud forest of western Sierra Madre del Sur of Oaxaca, Mexico. Charadrahyla sakbah sp. nov., is distinguished from the rest of the species in the genus by the large body size (81.15–85.75 mm and 67.91–73.21 mm in adult females and males respectively), axillary membrane, adult males with hypertrophied webbings between toes I and II, nuptial excrescences, one enlarged conical tubercle on either side of vent, vocal slits absent, and sexual dimorphism in the snout shape in dorsal profile (rounded and acuminate in females and males respectively). The hypertrophied webbings are a unique character among other hylids of Middle America, and are only present in C. trux, C. tecuani and the species described herein. These three species inhabit the cloud forest of the Sierra Madre del Sur, and are probably closely related. However, more detailed phylogenetic analyses are needed to define the internal relationships of the genus. The cloud forest in the Sierra Madre del Sur continues to be known for a high number of endemic species. However, the cloud forest faces several threats due to its limited distribution that make it a priority ecosystem for conservation.

Keywords: Amphibia, cloud forest, highlands, hylids, Sierra Madre del Sur


FIGURE 2. Specimens in life of Charadrahyla sakbah.
 (A) male holotype (IBH 30989). (B) male paratype (IBH 30990). (C) Female paratype (IBH 30992). (D) Female paratype (IBH 30993). (E) Female paratype (IBH 30994). (F) Enlarged vent tubercles in ventral view of C. sakbah of male holotype (IBH 30989) in life.

A female (not collected) of  Charadrahyla sakbah in the riverside.
 (B) Panoramic view of the Chite ku'e river. 
(C) Typical pool and waterfall where C. sakbah individuals are usually found.

 A female (not collected) of Charadrahyla sakbah in the riverside.

Charadrahyla sakbah sp. nov. 
Jiménez-Arcos, Calzada-Arciniega, Alfaro-Juantorena, Blair & Parra-Olea 
Mixteca Cloud-forest Treefrog, 
Rana arborícola de la Mixteca

Etymology. The specific epithet is taken from the Mixteco language word “sa’bah” which mean “frog”. This is recognition to the San Isidro Paz y Progreso community for their conservation efforts towards their natural and cultural resources.


Víctor H. Jiménez-Arcos, Rafael Alejandro Calzada-Arciniega, Liz A. Alfaro-Juantorena, Leopoldo Vázquez-Reyes, Christopher Blair and Gabriela Parra-Olea. 2019. A New Species of Charadrahyla (Anura: Hylidae) from the Cloud Forest of western Oaxaca, Mexico. Zootaxa. 4554(2); 371–385. DOI: 10.11646/zootaxa.4554.2.3  

   

Resumen: Se describe una nueva especie de rana arborícola del género Charadrahyla del bosque nublado de la Sierra Madre del Sur del oeste de Oaxaca, México. Charadrahyla sakbah sp. nov., se distingue del resto de las especies del género por su talla corporal grande (81.15–85.75 mm y 67.91–73.21 mm en hembras y machos adultos respectivamente), membrana axilar, machos adultos con membrana hipertrofiada entre los dedos I y II, presencia de excrecencias nupciales, un tubérculo cónico agrandado a cada lado de la cloaca, ausencia de hendiduras bucales y dimorfismo sexual en la forma de la nariz en vista dorsal (redonda y acuminada en hembras y machos respectivamente). La membrana hipertrofiada es una característica única entre otros hylidos de Mesoamérica y solo está presente en C. trux, C. tecuani y la especie descrita aquí. Estas tres especies habitan en el bosque nublado de la Sierra Madre del Sur, y probablemente estén estrechamente emparentadas. Sin embargo, son necesarios trabajos filogenéticos subsecuentes para definir con precisión las relaciones internas del género. El bosque de niebla de la Sierra Madre del Sur destaca por el alto número de especies endémicas. Sin embargo, enfrenta diversas amenazas debido principalmente a su limitada distribución, que lo convierte en un ecosistema prioritario para la conservación.
 Palabras clave: bosque mesófilo, tierras altas, hylidos, Sierra Madre del Sur

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