Browsing by Author "Acevedo, Aldemar A."

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    A new species of terrestrial-breeding frog of the genus Psychrophrynella (Anura: Strabomantidae) from the Cordillera de Vilcabamba, southeastern Peru
    (2020) Condori, F. Peter; Acevedo, Aldemar A.; Mamani, Luis; Delgado, J. Amanda; Chaparro, Juan C.
    A new frog of the genus Psychrophrynella is described based on specimens from the Cordillera de Vilcabamba, in the department of Cusco in southeastern Peru. The new species inhabits the humid puna and is only known from its type locality in Challcha, near the road between Vilcabamba and Pampaconas, at 3,707 m asl. This new taxon is assigned to the genus Psychrophrynella based on a narrowest genetic distance of 16S rRNA with P glauca (8.3%) and the presence of a fold-like tubercle on the inner edges of the tarsus. The description of Psychrophrynella vilcabambensis sp. nov. is based on three individuals. This new species can be differentiated from other members of the genera Psychrophrynella and Noblella by the combination of the following characters: light reddish-brown to tan coloration on the dorsum with dark brown markings, the presence of a thoracic fold, ulnar tubercles, a tubercle on the heel, three tubercles on outer edge of tarsus, and toes with lateral fringes. The SVL of male and female specimens are 16.5 and 16.6 mm, respectively.
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    Ecological and evolutionary trends of body size in Pristimantis frogs, the world's most diverse vertebrate genus
    (2022) Acevedo, Aldemar A.; Eduardo Palma, R.; Angel Olalla-Tarraga, Miguel
    Body size is a key organismal trait. However, the environmental and evolutionary factors that drive body size patterns at the interspecific level remain unclear. Here, we explored these relationships between phenotype-environment using neotropical frogs of Pristimantis, the world's most diverse vertebrate genus. We analyzed: (a) whether this group follows the Rensch's rule, a trend of sexual size dimorphism (SSD) to increase with size when males are the larger sex; (b) whether environmental constraints have influenced body size variation; and (c) how the rates of body size evolution have varied over time. Analyses were based on two information sources, the first one including body sizes of similar to 85% (495 species) of known species in the genus, and a second one incorporating molecular phylogenetic information for 257 species. Our results showed that all Pristimantis species exhibited marked SSD but did not follow Rensch's rule. We found that the models that best explained body size in males, females, and SSD contained environmental variations in temperature, precipitation, and elevation as predictors. In turn, body size has evolved toward an optimum, with a decelerating rate of evolution differentiated between the large Pristimantis clades.
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    First record and conservation status of Allobates algorei (Anura: Aromobatidae) in Colombia
    (2019) Acevedo, Aldemar A.; Armesto, Orlando; Leonardo Meza-Joya, Fabio