[Herpetology • 2018] Hyloscirtus hillisi • A New Treefrog (Anura, Hylidae, Hyloscirtus) from Cordillera del Cóndor with Comments on the Biogeographic Affinity between Cordillera del Cóndor and the Guianan Tepuis ---ScRaBBlE

Hyloscirtus hillisi 

Ron, Caminer, Varela-Jaramillo & Almeida-Reinoso, 2018

  DOI: 10.3897/zookeys.809.25207

Abstract

The Hyloscirtus larinopygion group is a clade of 16 species of large hylids that inhabit cascading Andean streams. They have brown coloration that, in most species, contrasts with bright marks. Herein morphological and genetic evidence is used to describe a new species of the group from Cordillera del Cóndor, a sub-Andean mountain chain that has phytogeographic affinities with the Guianan Tepuis. The new species is characterized by dark-brown coloration with contrasting bright orange flecks and by the presence of an enlarged and curved prepollex protruding as a spine. The new species is closely related to H. tapichalaca and an undescribed species from the southern Andes of Ecuador. The genetic distance between Hyloscirtus hillisi sp. n. and its closest relative, H. tapichalaca, is 2.9% (gene 16S mtDNA). Our phylogeny and a review of recently published phylogenies show that amphibians from Cordillera del Cóndor have close relationships with either Andean or Amazonian species. Amphibians do not show the Condor-Guianan Tepuis biogeographic link that has been documented in plants.

Keywords: Biodiversity, Colomascirtus, Ecuador, Hyloscirtus larinopygion group, Peru, prepollical spine, phylogeny

Figure 5. Variation in life of Hyloscirtus hillisi sp. n. from Reserva Biológica El Quimi.
A QCAZ 68649 (adult female, holotype, SVL = 65.78 mm) B QCAZ 68646 (subadult female, SVL = 48.55 mm) C not collected.

Figure 8. Color variation in life of juvenile and metamorphs of Hyloscirtus hillisi sp. n.
A SC 59268 (SVL = 39.52 mm, not preserved) B QCAZ 68648 (SVL = 35.6 mm) C QCAZ 68650 (SVL = 40.73 mm).

Hyloscirtus hillisi sp. n.

Diagnosis: The diagnosis and comparisons are based on one adult female, three adult males, and two subadult females. The new species is diagnosed by the following characters: mean SVL 70.3 mm in adult males (range 66.7–72.3; n = 3), 65.8 mm in one adult female; vomerine odontophores conic-shaped with a gap medially, each process with three to five prominent teeth; supracloacal flap ill-defined; supratympanic fold present; finger webbing formula: I basal II2-—3-III2½—2IV, toe webbing formula: I2-—2II1+—2+III1½—2½IV2½—1+V; forelimbs hypertrophied in males; enlarged and curved prepollex protruding as a spine in both sexes; fleshy calcar absent; dorsum, flanks, and dorsal areas of limbs dark grayish brown with tiny orange marks varying from abundant to sparse; venter dark grayish brown; iris bronze or yellowish with dark brown reticulation.

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Etymology: The specific name is a noun in the genitive case and is a patronym for David Hillis, an evolutionary biologist who has made significant contributions to the study of the evolution of amphibians and reptiles. During the 1980s, David Hillis carried out fieldwork in Ecuador that resulted in the discovery of three undescribed species of the H. larinopygion group. In 1990, in collaboration with WE Duellman, he published the first phylogeny for the H. larinopygion group using allozyme data (Duellman and Hillis 1990). Currently he is professor at the University of Texas in Austin.

Distribution and natural history: Hyloscirtus hillisi is only known from two nearby sites (airline distance = 1.7 km) on the slopes of a flattop limestone mountain in the Río Quimi basin, Provincia Zamora Chinchipe, at elevations between 1991 and 2134 m (Figure 2). Biogeographic region is Eastern Montane Forest according to Ron et al. (2018) classification. Vegetation at the type locality (Figure 11B, C) was dominated by shrubs (1.5 m tall) with sparse trees (10–15 m tall). The ground had cushioned consistency and was covered by roots and bare soil. Mosses and ground-bromeliads were abundant. This type of ground cover is locally known as bamba. Two adults and one juvenile were found on shrubs next to small streams on the Río Cristalino basin, at an elevation of 2134 m. The tadpoles and juveniles were found in ponds on the margin of Río Cristalino, at an elevation of 1991 m (Figure 11D). Collections took place in July 2017 and April 2018. The site where the adults were collected is ~500 m from the border between Peru and Ecuador. Therefore, the occurrence of H. hillisi in Peru is almost certain.

Figure 11. Habitat of Hyloscirtus hillisi sp. n.
A Hyloscirtus hillisi sp. n. in situ B vegetation at the type locality, Reserva Biológica El Quimi, Ecuador C habitat where the adults were found D habitat where the tadpoles and metamorphs were found. Photographs by Diego Almeida.

  

Figure 2. Records of the Southern Clade of the Hyloscirtus larinopygion group. Locality data were obtained from specimens deposited at Museo de Zoología, Pontificia Universidad Católica del Ecuador (QCAZ), Duellman and Hillis (1990), Almendáriz et al. (2014a), and Rivera-Correa et al. (2016). The arrow indicates the locality where the Northern and Southern clades are sympatric. See text for details.

 Figure 3. Records of the Northern Clade of the Hyloscirtus larinopygion group. Locality data were obtained from specimens deposited at Museo de Zoología, Pontificia Universidad Católica del Ecuador (QCAZ) and Duellman and Hillis (1990). The arrow indicates the locality where the Northern and Southern clades are sympatric. See text for details.

 Santiago R. Ron, Marcel A. Caminer, Andrea Varela-Jaramillo and Diego Almeida-Reinoso. 2018. A New Treefrog from Cordillera del Cóndor with Comments on the Biogeographic Affinity between Cordillera del Cóndor and the Guianan Tepuis (Anura, Hylidae, Hyloscirtus). ZooKeys. 809: 97-124.  DOI: 10.3897/zookeys.809.25207

 

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