Статті в журналах: "Amphibiens – Amazonie"

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FERREIRA, Gisele Cassundé, Marcelo J. STURARO, and Pedro L. Vieira PELOSO. "Amphibians and reptiles from Floresta Nacional de Pau-Rosa, Amazonas, Brazil: an important protected area at the heart of Amazonia." Acta Amazonica 47, no. 3 (July 2017): 259–68. http://dx.doi.org/10.1590/1809-4392201602982.

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ABSTRACT Amazonia harbors the largest and most diverse tropical forest in the world, but knowledge about the species diversity of the region is still far from ideal. Given this low level of faunal and floral knowledge, we present an annotated list of the species of amphibians and reptiles found in Floresta Nacional do Pau-Rosa (FNPR), along the Rio Paraconi, municipality of Maués, state of Amazonas, Brazil. Herpetofauna of the FNPR was sampled with pitfall traps, active search and occasional encounters from February 18 to March 28, 2009. A total of 270 specimens were collected, representing 39 species of amphibians and 24 species of reptiles. At least seven of the species collected at FNPR represented, at the time, unnamed taxa (four of which have now been named). The number of taxa collected and the high number of unnamed taxa highlight the importance of this area in terms of biodiversity and as a priority for conservation. We also discuss about the amphibian diversity in Amazonia.

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Rojas, Rommel R., Antoine Fouquet, Santiago R. Ron, Emil José Hernández-Ruz, Paulo R. Melo-Sampaio, Juan C. Chaparro, Richard C. Vogt, et al. "A Pan-Amazonian species delimitation: high species diversity within the genusAmazophrynella(Anura: Bufonidae)." PeerJ 6 (July 9, 2018): e4941. http://dx.doi.org/10.7717/peerj.4941.

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Amphibians are probably the most vulnerable group to climate change and climate-change associate diseases. This ongoing biodiversity crisis makes it thus imperative to improve the taxonomy of anurans in biodiverse but understudied areas such as Amazonia. In this study, we applied robust integrative taxonomic methods combining genetic (mitochondrial 16S, 12S and COI genes), morphological and environmental data to delimit species of the genusAmazophrynella(Anura: Bufonidae) sampled from throughout their pan-Amazonian distribution. Our study confirms the hypothesis that the species diversity of the genus is grossly underestimated. Our analyses suggest the existence of eighteen linages of which seven are nominal species, three Deep Conspecific Lineages, one Unconfirmed Candidate Species, three Uncategorized Lineages, and four Confirmed Candidate Species and described herein. We also propose a phylogenetic hypothesis for the genus and discuss its implications for historical biogeography of this Amazonian group.

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Ilha, Paulo, and Marianna Dixo. "Anurans and Lizards, Rio Preto da Eva, Amazonas, Brazil." Check List 6, no. 1 (February 1, 2010): 017. http://dx.doi.org/10.15560/6.1.017.

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This study presents a list of anurans and lizards of a Central Amazonian terra-firme rainforest site at Rio Preto da Eva, Amazonas, Brazil sampled for 38 days from December 2003 to February 2004. The study area is located close to highway AM-010 (Manaus-Itacoatiara), where deforestation represents the main threat to the local biota. Using two complementary sampling methods, active search and pitfall traps with drift fence, we recorded 23 anuran species in 12 genera and six families and 20 lizard species in 16 genera and seven families. Relative to other sites in Central Amazon, our study site presented a similar number of species of lizards but fewer amphibians.

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Hoorn, Carina, Lydian M. Boschman, Tyler Kukla, Matteo Sciumbata, and Pedro Val. "The Miocene wetland of western Amazonia and its role in Neotropical biogeography." Botanical Journal of the Linnean Society 199, no. 1 (February 5, 2022): 25–35. http://dx.doi.org/10.1093/botlinnean/boab098.

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Abstract In the Miocene (23–5 Ma), a large wetland known as the Pebas System characterized western Amazonia. During the Middle Miocene Climatic Optimum (c. 17–15 Ma), this system reached its maximum extent and was episodically connected to the Caribbean Sea, while receiving sediment input from the Andes in the west, and the craton (continental core) in the east. Towards the late Miocene (c. 10 Ma) the wetland transitioned into a fluvial-dominated system. In biogeographic models, the Pebas System is often considered in two contexts: one describing the system as a cradle of speciation for aquatic or semi-aquatic taxa such as reptiles, molluscs and ostracods, and the other describing the system as a barrier for dispersal and gene flow for amphibians and terrestrial taxa such as plants, insects and mammals. Here we highlight a third scenario in which the Pebas System is a permeable biogeographical system. This model is inspired by the geological record of the mid-Miocene wetland, which indicates that sediment deposition was cyclic and controlled by orbital forcing and sea-level change, with environmental conditions repeatedly altered. This dynamic landscape favoured biotic exchange at the interface of (1) aquatic and terrestrial, (2) brackish and freshwater and (3) eutrophic to oligotrophic conditions. In addition, the intermittent connections between western Amazonia and the Caribbean Sea, the Andes and eastern Amazonia favoured two-way migrations. Therefore, biotic exchange and adaptation was probably the norm, not the exception, in the Pebas System. The myriad of environmental conditions contributed to the Miocene Amazonian wetland system being one of the most species-rich systems in geological history.

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Pantoja, Davi Lima, and Rafael De Fraga. "Herpetofauna of the Reserva Extrativista do Rio Gregório, Juruá Basin, southwest Amazonia, Brazil." Check List 8, no. 3 (June 1, 2012): 360. http://dx.doi.org/10.15560/8.3.360.

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We present a checklist for reptiles and amphibians of the Reserva Extrativista do Rio Gregório, at the upper Juruá River basin, in the southwest Brazilian Amazonia. Using time-constrained searches, pitfall traps, vocalization, and accidental sightings, we recorded 84 species: 46 amphibians and 38 reptiles. Although analyses suggest still higher diversity, considering the short sampling time, relatively high species richness was documented, which reveals the relevance of this region for conservation. Species richness did not differ between upland and floodplain habitats. Species compositions were significant different between these habitat categories for amphibians and snakes, but not for lizards, suggesting some habitat preferences. Additionally, we found threatened and vulnerable species. We did not assess impacts of human activities on natural populations in RESEX do Rio Gregório, but since resident people have directly used natural resources (e.g. consuming turtles and modifying natural habitats), we recommend monitoring biodiversity to avoid negative impacts.

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Bernardo, Pedro H., Ricardo A. Guerra-Fuentes, William Matiazzi, and Hussam Zaher. "Checklist of Amphibians and Reptiles of Reserva Biológica do Tapirapé, Pará, Brazil." Check List 8, no. 5 (September 1, 2012): 839. http://dx.doi.org/10.15560/8.5.839.

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In this study we present a list of amphibians and reptiles from the Reserva Biológica do Tapirapé (REBIOTA), an area in the Amazonian rainforest in Pará State, Brazil. We sampled the area for 21 days, in both dry and rainy seasons, using pitfall traps and active searching methods. Our efforts resulted in the discovery of 35 species of amphibians and 27 species of reptiles. This study provides the first list of amphibians and adds eigh new species of reptiles for the Carajás region.

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Menin, Marcelo, Vinicius Tadeu de Carvalho, Alexandre P. Almeida, Marcelo Gordo, Deyla P. Oliveira, Luciana F. Luiz, Juliana V. Campos, and Tomas Hrbek. "Amphibians from Santa Isabel do Rio Negro, Brazilian Amazonia." Phyllomedusa: Journal of Herpetology 16, no. 2 (December 21, 2017): 183. http://dx.doi.org/10.11606/issn.2316-9079.v16i2p183-199.

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A species list of amphibians from Santa Isabel do Rio Negro in Brazilian Amazonia is provided. Collections were made from March–April 2012 along each of two 3-km trails with the following sampling methods: (1) pitfall traps with drift fences; (2) visual and auditory surveys; and (3) chance encounters. The trail at Daraá is north of the Rio Negro, whereas the other in Ayuanã is south of the river. Forty species of anurans and one salamander species representing 20 genera and nine families were recorded. The species composition was compared with those of 16 other studies conducted in the Guiana, Imeri, and Jaú areas of endemism, where species richness varies from 21–63, and similarity indices range from 23–100%. The anuran fauna at our sites resembles that of Flota Faro in eastern Amazonia more than it does that of the nearest site in the Departamento del Guainía of Colombia. The index of similarity is extremely variable between sites of the same and distinct areas of endemism. This pattern also was observed in the cluster analysis. As expected, geographically close areas have similar faunal compositions. However, the anuran fauna of Parque Nacional do Jaú (Jaú area of endemism) resembles that of Manaus (Guiana area of endemism) more closely than it does that of the Ayuanã River, which belongs to the same area of endemism as Parque Nacional do Jaú. The limits of the areas of endemism are better defined by the presence / absence of other terrestrial vertebrates, such as birds and mammals, than by the assemblage of amphibians and squamate reptiles.

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FERRANTE, Lucas, and Philip M. FEARNSIDE. "Evidence of mutagenic and lethal effects of herbicides on Amazonian frogs." Acta Amazonica 50, no. 4 (December 2020): 363–66. http://dx.doi.org/10.1590/1809-4392202000562.

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ABSTRACT Amphibians are excellent bioindicators because they are sensitive to chemical pollution and can indicate ecosystem changes due to the presence of or exposure to chemical compounds. Here we report evidence of the impact of herbicides, including glyphosate, on amphibians in a locality in the central Brazilian Amazon and compare it with data from other biomes in Brazil. We observed malformations in three species of Leptodactylus and local extinctions of Scinax ruber and Rhinella marina from reproductive sites close to an area where herbicides had been applied. The observations in the Amazon are similar to reports from Brazil’s Atlantic forest on morphological anomalies and mortality in amphibians exposed to herbicides. We warn of the threat of expanding crops for the production of biofuels in the Amazon due to their cultivation being associated with agrochemicals, including glyphosate, posing a threat to the biodiversity of the Amazon biome.

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Melo, Francisco Tiago de Vasconcelos, Caroline do Socorro Barros Melo, Luciana de Cássia Silva do Nascimento, Elane Guerreiro Giese, Adriano Penha Furtado, and Jeannie Nascimento dos Santos. "Morphological characterization of Eustrongylides sp. larvae (Nematoda, Dioctophymatoidea) parasite of Rhinella marina (Amphibia: Bufonidae) from Eastern Amazonia." Revista Brasileira de Parasitologia Veterinária 25, no. 2 (June 7, 2016): 235–39. http://dx.doi.org/10.1590/s1984-29612016024.

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Absctract Eustrongylides spp. nematodes have birds as final hosts and uses other vertebrates as intermediate/paratenic host (fish, amphibians and reptiles) and have zoonotic potential. In amphibians, the larvae may be located in the subcutaneous tissues, liver and mesentery, between the muscle fibres, especially in the lower limbs. Rhinella marina, which is widely observed in Brazil, has exhibited complex diversity in its helminth fauna, reflecting the unique habitat of the Amazon biome. For the first time, this study describes the morphological aspects of third-stage larvae of Eustrongylides sp. in Rhinella marina from Santa Cruz do Ararí, Marajó Archipelago, Eastern Amazonia, using light and scanning electron microscopy.

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Prudente, Ana Lúcia Da Costa, Marcelo José Sturaro, Alessandra Elisa Melo Travassos, Gleomar Fabiano Maschio, and Maria Cristina Santos-Costa. "Anurans of the Urucu Petrol Basin, municipality of Coari, State of Amazonas, northern Brazil." Check List 9, no. 3 (June 1, 2013): 601. http://dx.doi.org/10.15560/9.3.601.

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We present the first species amphibian list for municipality of Coari, state of Amazonas, Brazil. The list was drawn up as a result of data obtained from specimens deposited in the Herpetological Collection of the Museu Paraense Emílio Goeldi and inventories conducted in the Urucu Petrol Base, in 2003-2004 and 2007-2009. Sampling methods included pitfall traps with drift fences and time constrained searches. We considered the data collected by other researchers, incidental encounters and records of dead individual on the road. Fifty four species were recorded. Rhinella gr. margaritifera (n= 68), Adenomera gr. marmorata (n= 59), and Osteocephalus leprieurii (n= 20) were the most collected, while ten species were less collected. Compared with other studies in eastern Amazonia, the region of Urucu presented a large number of anurans. Nonetheless, it ́s not possible to confirm this because the data collected were not standardized among studies. However, further studies by, increasing the sampling effort, could prove this area to be richer in anurans than that observed so far.

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RAASCH-FERNANDES, Livia Deice, Solange Maria BONALDO, Domingos de Jesus RODRIGUES, Stela Regina FERRARINI, Ana Gabriela Araújo VERÇOSA, and Daiane Lopes de OLIVEIRA. "In vitro antimicrobial activity of methanolic extracts from cutaneous secretions of Amazonian amphibians against phytopathogens of agricultural interest." Acta Amazonica 51, no. 2 (June 2021): 145–55. http://dx.doi.org/10.1590/1809-4392201904462.

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ABSTRACT The biochemical defense mechanisms of amphibians involve cutaneous secretions of bioactive molecules with antimicrobial activity. This study evaluated the in vitro activity of methanolic extracts from cutaneous secretions of two amphibian species of the Bufonidae family, Rhaebo guttatus and Rhinella marina, in the control of the phytopathogens Fusarium udum, Fusarium solani, Colletotrichum truncatum, Aspergillus flavus, Rhizoctonia solani, Macrophomina phaseolina, and Calonectria pseudometrosideri. The R. guttatus extract decreased the mycelial growth of F. udum, F. solani, A. flavus, and M. phaseolina at some tested concentrations. The R. marina extract decreased the mycelial growth of C. truncatum at the concentration of 0.5 mg mL-¹, and inhibited the mycelial growth of A. flavus at concentrations of 0.1 and 0.5 mg mL-¹, which was similar to the inhibition by the positive control. The R. marina extract also decreased the microsclerotia production by R. solani at concentrations of 0.2 and 0.3 mg mL-¹. In addition, the extracts inhibited conidial sporulation and germination at varying degrees. The inhibition of appressoria formation in C. truncatum by the R. guttatus and R. marina extracts was 85-99% and 63-100%, respectively. Our results demonstrated that treatment with extracts from R. guttatus and R. marina cutaneous secretions showed antifungal activity against the studied phytopathogens.

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MACIEL, ADRIANO O., and MARINUS S. HOOGMOED. "Taxonomy and distribution of caecilian amphibians (Gymnophiona) of Brazilian Amazonia, with a key to their identification." Zootaxa 2984, no. 1 (August 3, 2011): 1. http://dx.doi.org/10.11646/zootaxa.2984.1.1.

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Based on examination of 622 specimens of Gymnophiona, 15 species are recognized for Brazilian Amazonia. Geographical variation in characters is low and is mainly restricted to the number of annuli. One new species is described, Microcaecilia rochai sp. nov. New distribution data and maps for most species are provided. A key to the identification of caecilians of Brazilian Amazonia is presented.

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Azevedo-Ramos, Claudia, and Ulisses Galatti. "Patterns of amphibian diversity in Brazilian Amazonia: conservation implications." Biological Conservation 103, no. 1 (January 2002): 103–11. http://dx.doi.org/10.1016/s0006-3207(01)00129-x.

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von May, Rudolf, Jennifer M. Jacobs, Roy Santa-Cruz, Jorge Valdivia, Jusmell M. Huamán, and Maureen A. Donnelly. "Amphibian community structure as a function of forest type in Amazonian Peru." Journal of Tropical Ecology 26, no. 5 (July 30, 2010): 509–19. http://dx.doi.org/10.1017/s0266467410000301.

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Abstract:The potential effect of forest type on the structuring of animal communities in western Amazonia remains poorly understood. In this study, we tested the hypothesis that amphibian species richness, composition and abundance differ across forest types in the lowland rain forest of south-eastern Peru. By using 320 individual transects, we compared the amphibian assemblages across four major forest types (floodplain, terra firme, bamboo and palm swamp) at each of four sites separated by 3.5–105 km. We identified 1967 individuals of 65 species in 11 families and found that a large proportion of the amphibian diversity in this region is attributed to habitat-related beta diversity. Overall, we found that forest type is more important than site in predicting both species composition and abundance. We also found that, when analyses are conducted separately for each forest type and include species abundance data, similarity between assemblages decreases with increasing geographic distance. In contrast to studies that considered species presence/absence but ignored species abundances, our results highlight the importance of including abundance data in the assessment of animal diversity patterns in western Amazonia. We conclude that evaluating community structure across forest types can improve our understanding of diversity patterns in this region.

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Felipe Toledo, Luís, Miguel Trefaut Rodrigues, Carlos Jared, Vanessa Kruth Verdade, and Marta Maria Antoniazzi. "The Amazonian toad Rhaebo guttatus is able to voluntarily squirt poison from the paratoid macroglands." Amphibia-Reptilia 32, no. 4 (2011): 546–49. http://dx.doi.org/10.1163/156853811x603724.

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AbstractAmphibian defence mechanisms commonly rely on cutaneous toxins produced in either isolated or clustered glands, such as toad parotoid macroglands. In contrast to the passive mechanism of poison liberation in other amphibians, we discovered that the Amazonian toad Rhaebo guttatus is unique because it can voluntarily squirt jets of poison from its parotoids.

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Funk, W. Chris, Marcel Caminer, and Santiago R. Ron. "High levels of cryptic species diversity uncovered in Amazonian frogs." Proceedings of the Royal Society B: Biological Sciences 279, no. 1734 (November 30, 2011): 1806–14. http://dx.doi.org/10.1098/rspb.2011.1653.

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One of the greatest challenges for biodiversity conservation is the poor understanding of species diversity. Molecular methods have dramatically improved our ability to uncover cryptic species, but the magnitude of cryptic diversity remains unknown, particularly in diverse tropical regions such as the Amazon Basin. Uncovering cryptic diversity in amphibians is particularly pressing because amphibians are going extinct globally at an alarming rate. Here, we use an integrative analysis of two independent Amazonian frog clades, Engystomops toadlets and Hypsiboas treefrogs, to test whether species richness is underestimated and, if so, by how much. We sampled intensively in six countries with a focus in Ecuador ( Engystomops : 252 individuals from 36 localities; Hypsiboas : 208 individuals from 65 localities) and combined mitochondrial DNA, nuclear DNA, morphological, and bioacoustic data to detect cryptic species. We found that in both clades, species richness was severely underestimated, with more undescribed species than described species. In Engystomops , the two currently recognized species are actually five to seven species (a 150–250% increase in species richness); in Hypsiboas , two recognized species represent six to nine species (a 200–350% increase). Our results suggest that Amazonian frog biodiversity is much more severely underestimated than previously thought.

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Gonçalves Ferreira, Vanessa, Rafaela Thaler, Henrique Folly, and Leandro Alves da Silva. "A new record for the milk frog Trachycephalus coriaceus (ANURA: HYLIDAE) from teles pires river, South Amazonia, Brazil." Acta Biológica Colombiana 26, no. 2 (January 15, 2021): 283–86. http://dx.doi.org/10.15446/abc.v26n2.87779.

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Herein, we report a new record of the milk frog Trachycephalus coriaceusfor the Brazilian southern Amazonia and provide an updated geographic distribution map. We collected one specimen of T. coriaceuson 8 november 2016, during a nocturnal survey inside a dense ombrophilousforest in the right bank of the Teles Pires River, municipality of Jacareacanga, southern of Pará State. The record of T. coriaceusto Jacareacanga is the first to the State. The disjoint geographic distribution of this species along de Amazonia may just reflect the paucity of amphibian knowledge throughout this biome and the difficulty to detect this species in the field, given its explosive reproductive behavior.

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MENIN, Marcelo, Rafaela Fernanda Batista FERREIRA, Izomar Barbosa MELO, Marcelo GORDO, Gustavo Yomar HATTORI, and Bruno Sampaio SANT’ANNA. "Anuran diversity in urban and rural zones of the Itacoatiara municipality, central Amazonia, Brazil." Acta Amazonica 49, no. 2 (April 2019): 122–30. http://dx.doi.org/10.1590/1809-4392201800284.

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ABSTRACT Few studies in the Amazon region have evaluated anuran diversity in urban forest fragments or in areas with differing degrees of anthropogenic impact. We determined the composition and abundance of the anurofauna in urban and rural sites within the municipality of Itacoatiara in central Amazonia, Brazil. Specimens were sampled from January 2012 to May 2013 in 10 urban sites and five rural sites. A total of 1,538 anurans (930 in rural sites and 608 in urban sites) were recorded, belonging to 29 species in five families. Species richness was higher in rural sites, with 10 exclusive species. All species found in urban sites were also found in rural sites, however, species abundance varied considerably between the habitats. Sampling- and individual-based rarefaction curves showed a tendency toward stabilization of species richness only in the urban sites. We concluded that the anuran assemblages in the urban sites are depauperate due to the absence of many species associated to pristine terra firme or várzea and igapó forests. Habitat loss and quality degradation in urban landscapes are the main factors threatening amphibian diversity. The anuran assemblages in our study areas were similar to those recorded in other Amazonian habitats. Conservation measures involving anurans in this region should consider the preservation of habitat mosaics, including both pristine terra firme, várzea and igapó forests.

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Dantas-Torres, Filipe, Amanda Maria Picelli, Kamila Gaudêncio da Silva Sales, Lucas Christian de Sousa-Paula, Paulo Mejia, Igor Luis Kaefer, Lucio André Viana, and Felipe Arley Costa Pessoa. "Ticks on reptiles and amphibians in Central Amazonia, with notes on rickettsial infections." Experimental and Applied Acarology 86, no. 1 (December 16, 2021): 129–44. http://dx.doi.org/10.1007/s10493-021-00682-8.

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Pearman, Peter B. "Correlates of Amphibian Diversity in an Altered Landscape of Amazonian Ecuador. Correlaciones de la Diversidad de Anfibios en un Paisaje Alterado de la Amazonia Ecuatoriana." Conservation Biology 11, no. 5 (October 16, 1997): 1211–25. http://dx.doi.org/10.1046/j.1523-1739.1997.96202.x.

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Jiménez-Robles, Octavio, Juan M. Guayasamin, Santiago R. Ron, and Ignacio De la Riva. "Reproductive traits associated with species turnover of amphibians in Amazonia and its Andean slopes." Ecology and Evolution 7, no. 8 (March 14, 2017): 2489–500. http://dx.doi.org/10.1002/ece3.2862.

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Duellman, William E. "Temporal Fluctuations in Abundances of Anuran Amphibians in a Seasonal Amazonian Rainforest." Journal of Herpetology 29, no. 1 (March 1995): 13. http://dx.doi.org/10.2307/1565080.

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MOULATLET, Gabriel M., Emmanuel AMBRIZ, Jennifer GUEVARA, Karima G. LÓPEZ, Marina RODES-BLANCO, Nereida GUERRA-ARÉVALO, H. Mauricio ORTEGA-ANDRADE, and Pablo MENESES. "Multi-taxa ecological responses to habitat loss and fragmentation in western Amazonia as revealed by RAPELD biodiversity surveys." Acta Amazonica 51, no. 3 (September 2021): 234–43. http://dx.doi.org/10.1590/1809-4392202004532.

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ABSTRACT Habitat loss and fragmentation caused by deforestation are important anthropogenic drivers of changes in biodiversity in the Amazon rainforest, and has reached its highest rate in recent decades. However, the magnitude and direction of the effects on species composition and distribution have yet to be fully understood. We evaluated the responses of four taxonomic groups − birds, amphibians, orchid bees, and dung beetles - to habitat loss and fragmentation at both species and assemblage level in the northern Ecuadorian Amazon. We sampled fifteen 250-m long plots in terra-firme forest remnants. We calculated one landscape fragmentation index (fragindex), which considers the proportion of continuous forest cover, edge density and isolation in the landscape, and nine landscape configuration metrics. Logistic regression models and multivariate regression trees were used to analyze species and assemblage responses. Our results revealed that over 80% of birds, amphibians or orchid-bee species, and 60% of dung beetles were negatively affected by habitat loss and fragmentation. Species composition of all taxonomic groups was significantly affected by differences in forest cover and connectivity. Less than 5% of all species were restricted to landscapes with fragindex values higher than 40%. Landscape metrics related to the shape and area of forest patches determined the magnitude and direction of the effect on species responses. Therefore, changes in the landscape configuration of Ecuadorian Amazonia should be minimized to diminish the effects of habitat loss and fragmentation on species occurrence and assemblage composition.

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Ron, Santiago R., Marcel A. Caminer, Andrea Varela-Jaramillo, and Diego Almeida-Reinoso. "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 (December 19, 2018): 97–124. http://dx.doi.org/10.3897/zookeys.809.25207.

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TheHyloscirtuslarinopygiongroup 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 toH.tapichalacaand an undescribed species from the southern Andes of Ecuador. The genetic distance betweenH.hillisisp. 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.

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Lima, Janaína R., Ulisses Galatti, Crisalda J. Lima, Sarita B. Fáveri, Heraldo L. Vasconcelos, and Selvino Neckel-Oliveira. "Amphibians on Amazonian Land-Bridge Islands are Affected More by Area Than Isolation." Biotropica 47, no. 3 (February 12, 2015): 369–76. http://dx.doi.org/10.1111/btp.12205.

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Brown, Jason L., Victor Morales, and Kyle Summers. "Tactical reproductive parasitism via larval cannibalism in Peruvian poison frogs." Biology Letters 5, no. 2 (November 28, 2008): 148–51. http://dx.doi.org/10.1098/rsbl.2008.0591.

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We report an unusual example of reproductive parasitism in amphibians. Dendrobates variabilis , an Amazonian poison frog, oviposits at the surface of the water in small pools in plants and deposits tadpoles within the pools. Tadpoles are highly cannibalistic and consume young tadpoles if they are accessible. Deposition of embryos and tadpoles in the same pool is common. Genetic analyses indicate that tadpoles are frequently unrelated to embryos in the same pool. A pool choice experiment in the field demonstrated that males carrying tadpoles prefer to place them in pools with embryos, facilitating reproductive parasitism via cannibalism.

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Santos, Juan C., Luis A. Coloma, Kyle Summers, Janalee P. Caldwell, Richard Ree, and David C. Cannatella. "Amazonian Amphibian Diversity Is Primarily Derived from Late Miocene Andean Lineages." PLoS Biology 7, no. 3 (March 10, 2009): e1000056. http://dx.doi.org/10.1371/journal.pbio.1000056.

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Deichmann, Jessica L., G. Bruce Williamson, Albertina P. Lima, and Warren D. Allmon. "A note on amphibian decline in a central Amazonian lowland forest." Biodiversity and Conservation 19, no. 12 (September 17, 2010): 3619–27. http://dx.doi.org/10.1007/s10531-010-9920-z.

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Schiesari, Luis, Jansen Zuanon, Claudia Azevedo-Ramos, Marcelo Garcia, Marcelo Gordo, Mariluce Messias, and Emerson Monteiro Vieira. "Macrophyte rafts as dispersal vectors for fishes and amphibians in the Lower Solimões River, Central Amazon." Journal of Tropical Ecology 19, no. 3 (April 28, 2003): 333–36. http://dx.doi.org/10.1017/s0266467403003365.

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Large rivers have played a prominent role in biogeographic theory for their potential to act as barriers for the dispersal of terrestrial organisms,and therefore be involved in the generation of species diversity (Brown & Lomolino 1998). In this paper, we document the potential role of macrophyte rafts as a mechanism by which Amazonian rivers could act as dispersal agents rather than barriers, transferring organisms across banks and possibly across very large distances. These vectors could therefore act against speciation and towards homogenization of the local biota.

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Fonte, Luis Fernando Marin da, Guillaume Latombe, Marcelo Gordo, Marcelo Menin, Alexandre Pinheiro de Almeida, Cang Hui, and Stefan Lötters. "Amphibian diversity in the Amazonian floating meadows: a Hanski core‐satellite species system." Ecography 44, no. 9 (June 9, 2021): 1325–40. http://dx.doi.org/10.1111/ecog.05610.

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31

Mignet, Fabien. "Biology and Captive Breeding of the Amazonian Milk Frog, Trachycephalus resinifictrix (Goeldi 1907)." Reptiles & Amphibians 22, no. 2 (June 1, 2015): 68–75. http://dx.doi.org/10.17161/randa.v22i2.14047.

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Although the Amazonian Milk Frog (Trachycephalus resinifictrix) is commonly bred in captivity in zoological institutions worldwide, very little information regarding these undertakings has been published. Here, I report my experience with the successful breeding of T. resinifictrix at the Touroparc Zoo. I highlight some fundamental biological traits in order to fulfill the requirements for captive breeding and to ensure the general welfare of these frogs. The aim is to provide guidelines that may be used by zoos, aquariums, and other facilities as well as private contributions to conservation breeding programs for endangered anurans with requirements similar to those of T. resinifictrix. In general, this species is easy to keep in captivity. Larvae are easy to produce and raise with very low mortality rates. They usually metamorphose at six to ten weeks. However, newly metamorphosed frogs are fragile and require more attention. Several pathogens are known to affect the health of amphibians, and stress can play an important role in immune function.

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Gascon, Claude. "Amphibian Litter Fauna and River Barriers in Flooded and Non-Flooded Amazonian Rain Forest." Biotropica 28, no. 1 (March 1996): 136. http://dx.doi.org/10.2307/2388779.

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LAVILLA, ESTEBAN O., JOSÉ A. LANGONE, ULISSES CARAMASCHI, JOSÉ P. Jr POMBAL, and RAFAEL O. DE SÁ. "Comments on the neotype of Rana margaritifera Laurenti, 1768 (Anura, Bufonidae)." Zootaxa 4286, no. 1 (June 29, 2017): 113. http://dx.doi.org/10.11646/zootaxa.4286.1.5.

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After more than two and half centuries regarding the identity of Rana margaritifera Laurenti, 1768, Lavilla et al. (2013) designated a neotype for the species. The authors did an extensive search to locate the type material of Laurenti (1768) and failed in finding the specimen in question. Consequently, they selected an adult female collected in the Municipality of Humaitá, State of Amazonas, Brazil, on 12 April 1985 and deposited in the Museu Nacional, Rio de Janeiro, Brazil, MNRJ 71538. This action, was carried out to solve a specific taxonomic problem in Neotropical amphibian systematics, i.e., the type specimen considered lost and the type locality uncertain. However, this action proved to be erroneous, since the type specimen is not lost.

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Acioli, Ellen Cristina Serrão, and Selvino Neckel-Oliveira. "Reproductive biology of Ameerega trivittata (Anura: Dendrobatidae) in an area of terra firme forest in eastern Amazonia." Acta Amazonica 44, no. 4 (December 2014): 473–80. http://dx.doi.org/10.1590/1809-4392201305384.

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The reproductive success of tropical amphibians is influenced by factors such as body size and the characteristics of breeding sites. Data on reproductive biology are important for the understanding of population dynamics and the maintenance of species. The objectives of the present study were to examine the abundance of Ameerega trivittata, analyze the use of microhabitats by calling males and the snout-vent length (SVL) of breeding males and females, the number of tadpoles carried by the males and mature oocytes in the females, as well as the relationship between the SVL of the female and both the number and mean size of the mature oocytes found in the ovaries. Three field trips were conducted between January and September, 2009. A total of 31 plots, with a mean area of 2.3 ha, were surveyed, resulting in records of 235 individuals, with a mean density of 3.26 individuals per hectare. Overall, 66.1% of the individuals sighted were located in the leaf litter, while 17.4% were perched on decaying tree trunks on the forest floor, 15.7% on the aerial roots of Cecropia trees, and 0.8% on lianas. Males were observed transporting a mean of 10.8 tadpoles on their backs. A significant correlation was found between the size of the females and the mean diameter of the oocytes. New data were collected on the size of oocytes and no pattern was found in the type of perches used by calling males of the different Ameerega species.

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Peres, Carlos A. "Primate community structure at twenty western Amazonian flooded and unflooded forests." Journal of Tropical Ecology 13, no. 3 (May 1997): 381–405. http://dx.doi.org/10.1017/s0266467400010580.

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ABSTRACTThis paper presents data from a standardized series of line-transect censuses on the species and subspecies composition, population density, and crude biomass of western Amazonian primate communities occurring at eight flooded (= vázea) and 12 unflooded (= terra firme) forests. These were located primarily along one of the largest white-water tributaries of the Amazon (= Solimōes), the Juruá river. On average, terra firme forests contained twice as many primate species, lower population densities, and less than half of the total community biomass than did adjacent várzea forests. There was a clear habitat-dependent positive association among primate species, particularly within várzea forests, as well as marked shifts in guild structure between forest types. Species turnover between these two forest types involved primarily understorey insectivores (e.g. Saguinus sp.), which do not occur in seasonally inundated forest. These were consistently replaced by squirrel monkeys (Saimiri sp.), which are extremely abundant in annually flooded várzea forests. Similarly, large-bodied folivores such as red howler monkeys (Alouatta seniculus) were uncommon or rare in terra firme forests, but very abundant in várzea forests, even though they are hunted less intensively in the former than in the latter. This can be largely explained by the nutrient-rich alluvial soils of young floodplains, compared to the heavily weathered terra firme soils occurring even within short distances of major white-water rivers. This study clearly shows a reversed diversity/density pattern resulting from the lower species richness, but high overall community biomass of seasonally flooded Amazonian forests, which can now be generalized for a wide range of terrestrial vertebrate taxa, including amphibians, birds, and several other orders of mammals.

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Moraes, Leandro J. C. L., Dante Pavan, Maria C. Barros, and Camila C. Ribas. "The combined influence of riverine barriers and flooding gradients on biogeographical patterns for amphibians and squamates in south-eastern Amazonia." Journal of Biogeography 43, no. 11 (June 20, 2016): 2113–24. http://dx.doi.org/10.1111/jbi.12756.

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von May, Rudolf, Margarita Medina-Müller, Maureen A. Donnelly, and Kyle Summers. "Breeding-site selection by the poison frog Ranitomeya biolat in Amazonian bamboo forests: an experimental approach." Canadian Journal of Zoology 87, no. 5 (May 2009): 453–64. http://dx.doi.org/10.1139/z09-026.

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Habitat selection in amphibians has typically been investigated using species that breed in medium-sized to large bodies of water. So far, few studies have focused on tropical, phytotelm-breeding species. We examined habitat selection in the context of reproductive resource use by Ranitomeya biolat (Morales, 1992), a poison frog that uses bamboo internodes as breeding sites. We conducted field observations and experiments using bamboo and PVC sections to test the effect of physical and biotic factors on tadpole deposition. Our field observations indicated that water volume, as well as internode length, height, and angle, may be important for tadpole deposition. We predicted that adult R. biolat would deposit tadpoles in pools that are close to the ground, pools with high water volume, pools contained in long structures, and pools without conspecific tadpoles or heterospecific predators. Our experiments demonstrated that water volume and the length of the structure containing the pool affect the pattern of tadpole deposition. Tadpoles were also deposited more frequently in experimental pools containing no other tadpoles or no predators. Our results support the prediction that phytotelm-breeding species, to maximize their reproductive success, should deposit their tadpoles in pools with water volumes that maximize nutrient content and that present no competitors or predators.

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GUAYASAMIN, JUAN M., and W. CHRIS FUNK. "The amphibian community at Yanayacu Biological Station, Ecuador, with a comparison of vertical microhabitat use among Pristimantis species and the description of a new species of the Pristimantis myersi group." Zootaxa 2220, no. 1 (September 4, 2009): 41–66. http://dx.doi.org/10.11646/zootaxa.2220.1.2.

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We provide information regarding the composition of the amphibian community at Yanayacu Biological Station, on the Amazonian slopes of the Andes of Ecuador, and describe a new species of Pristimantis that is referred to the P. myersi group. The new species is distinguished from other species of the group mainly by its color pattern, and by lacking ulnar and tarsal tubercles. The advertisement call of the new species has two distinct call types, a short call with 1–3 pulses and a long call with a mean of 15.5–18.9 more rapid pulses, which are often produced together in long call series. Finally, we analyze the microhabitat use of Pristimantis species found at Yanayacu and find that there is significant variation in vertical habitat use among Pristimantis, highlighting the ecological diversity of sympatric species.

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Peloso, Pedro Luiz Vieira. "A safe place for amphibians? A cautionary tale on the taxonomy and conservation of frogs, caecilians, and salamanders in the Brazilian Amazonia." Zoologia (Curitiba) 27, no. 5 (October 2010): 667–73. http://dx.doi.org/10.1590/s1984-46702010000500001.

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40

Kaefer, Igor Luis, and Albertina Pimentel Lima. "Sexual signals of the Amazonian frog Allobates paleovarzensis: geographic variation and stereotypy of acoustic traits." Behaviour 149, no. 1 (2012): 15–33. http://dx.doi.org/10.1163/156853912x623757.

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AbstractBecause of its close relationship with the process of evolutionary differentiation, it is expected that geographic variability in acoustic sexual traits should be greater among than within populations. This is particularly expected in organisms with typically high population genetic structure and low dispersal abilities, such as anuran amphibians. We studied the acoustic traits of the advertisement call in the small-sized dendrobatoid frog Allobates paleovarzensisthrough its range in Central Amazonia. We accessed the variability of call traits from the within-male to the among-population levels, and evaluated the degree of stereotypy of the call characteristics. Call variability had comparable magnitudes within and among populations, and was independent of the degree of stereotypy of call measurements. Therefore, none of the call traits stood out as a potential cue for discrimination between populations. Spectral call measurements were static and strongly related with body size, which explained between 30 and 35% of the variation of these acoustic traits. Temporal characters of the notes were dynamic and influenced by environmental temperature (e.g., 27% of note rate variation), whilst temporal measurements of the entire calls were not related to the co-factors analysed. Both spectral and temporal call traits varied among populations and between sides of the Amazon River. Our results also indicate that body size and sampling site jointly affected the variability of the call traits. However, geographic distances among populations and the river barrier had no significant effect on the overall acoustic variation, indicating that local stabilising selective forces may be important in the process of call differentiation.

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DE ALMEIDA, ALEXANDRE P., LEANDRO J. C. L. MORAES, ROMMEL R. ROJAS, IGOR J. ROBERTO, VINICIUS TADEU DE CARVALHO, ROBSON W. ÁVILA, LUCIANA FRAZÃO, et al. "Phylogenetic relationships of the poorly known treefrog Boana hobbsi (Cochran & Goin, 1970) (Anura: Hylidae), systematic implications and remarks on morphological variations and geographic distribution." Zootaxa 4933, no. 3 (February 22, 2021): 301–23. http://dx.doi.org/10.11646/zootaxa.4933.3.1.

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Boana hobbsi is a poorly known hylid frog currently placed within the Boana punctata group. Yet, morphological, ecological and bioacoustic traits do not support this placement, with no molecular data being available to date to test this hypothesis. Based on newly collected mitochondrial DNA sequences, morphological data review and field observations, we provide new insight into the phylogenetic relationships, morphological variations and geographic distribution of B. hobbsi. Our findings reveal that B. hobbsi is nested (with strong support) within the Boana benitezi group, recovering once more a polyphyletic Boana punctata group. Supported by this new genetic, morphological and ecological evidence, we propose a new taxonomic arrangement which includes B. hobbsi as a member of the Boana benitezi group. Furthermore, we emphasize the importance of conducting biological inventories in remote Amazonian areas, where many taxonomic and geographic knowledge gaps persist with regards to Amphibian diversity.

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Caminer, Marcel A., and Santiago R. Ron. "Systematics of the Boana semilineata species group (Anura: Hylidae), with a description of two new species from Amazonian Ecuador." Zoological Journal of the Linnean Society 190, no. 1 (March 21, 2020): 149–80. http://dx.doi.org/10.1093/zoolinnean/zlaa002.

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Abstract The combination of genetic and phenotypic characters for species delimitation has allowed the discovery of many undescribed species of Neotropical amphibians. In this study, we used DNA sequences (genes 12S, 16S, ND1 and COI) and morphologic, bioacoustic and environmental characters of the Boana semilineata group to evaluate their phylogenetic relationships and assess their species limits. In addition, we included DNA sequences of several species of Boana to explore cryptic diversity in other groups. We found three Confirmed Candidate Species (CCS) within the B. semilineata group. Holotype examination of Hyla appendiculata shows that it is a valid species that corresponds to one of the CCS, which is here transferred to Boana. We describe the two remaining CCS. Our phylogeny highlights a number of secondary but meaningful observations that deserve further investigation: (1) populations of B. pellucens from northern Ecuador are more closely related to B. rufitela from Panama than to other Ecuadorian populations of B. pellucens; (2) we report, for the first time, the phylogenetic relationships of B. rubracyla showing that it is closely related to B. rufitela and B. pellucens; and (3) B. cinerascens and B. punctata form two species complexes consisting of several unnamed highly divergent lineages. Each of these lineages likely represents an undescribed species.

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Brum, T. R., M. Santos-Filho, G. R. Canale, and A. R. A. Ignácio. "Effects of roads on the vertebrates diversity of the Indigenous Territory Paresi and its surrounding." Brazilian Journal of Biology 78, no. 1 (June 12, 2017): 125–32. http://dx.doi.org/10.1590/1519-6984.08116.

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Abstract Roadkill impact is still underestimated due to the lack of knowledge of its intensity and effect on animal populations. To assess differences between animal roadkills on roads in distinct landscapes, this study recorded meso- and megavertebrate roadkills along 50 km during a year in two highways in the transitional area of Amazonia/Cerrado in Tangará da Serra, Mato Grosso: MT-358 and MT-235, the latter crossing the Paresi Indigenous Land. We assessed roadkill rates and points with higher rates of roadkills, recording the most impacted species, seasonal effects, biomass loss, activity period of species, and traffic volume. We recorded 178 roadkills in 4,950 km travelled, a rate of 0.035 animal/km-travelled. Mammals were the most impacted with 135 roadkills (75.8%), followed by reptiles (6.2%), amphibians (5.6%) and birds (5.1%). Among mammals 51.1% were Carnivora, and the most impacted species was Cerdocyon thous (n = 42). On highway MT-358 (human-modified landscape), we recorded 155 roadkilled mammals, and the most impacted were C. thous (23.9%) and Euphractus sexcinctus (13.5%). Whilst on highway MT-235 (Paresi Indigenous Land), we recorded 23 roadkilled mammals, and the most impacted were Myrmecophaga tridactyla (26.1%) and C. thous (21.7%). The low roadkill rate in the Paresi Indigenous Land might be related to the presence of fauna pathways along the highway and the availability of a forested landscape.

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Silva e Silva, Yuri Breno, and Carlos Eduardo Costa-Campos. "Anuran species composition of Cancão Municipal Natural Park, Municipality of Serra do Navio, Amapá state, Brazil." ZooKeys 762 (May 31, 2018): 131–48. http://dx.doi.org/10.3897/zookeys.762.22634.

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In this study, the first survey of anuran species in the Cancão Municipal Natural Park is presented, a protected area of approximately 370 hectares of Amazonian forest located in the northwest center region of the state of Amapá, Brazil. The work was performed during the dry and rainy season, through active visual and auditory survey, totaling 216 man hours of sampling effort. Forty-nine species of anuran amphibians were recorded in the Cancão Municipal Natural Park, including three new records:Hyalinobatrachiumiaspidiense, Pristimantiscf.ockendeni, andScinaxgarbei. Three species,Hyalinobatrachiumiaspidiense,Ameeregapulchripecta, andAnomaloglossusbaeobatrachus, are listed as Data Deficient and one is listed as Vulnerable (Atelopushoogmoedi) according red lists of IUCN. The rarefaction curve cumulative species did not reach an asymptote, indicating that site has potential for species that have not yet been recorded. Nine species were represented by only one individual and were considered rare in the studied environments, eight species were defined as common, and the 32 remaining species were classified as having intermediary abundance. Our data indicated that Cancão Municipal Natural Park contains a considerable portion of the anurans species richness of Amapá state, turn the area into a place of great importance for the conservation of the anurans of the Eastern Amazon.

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Espírito‐Santo, Helder Mateus Viana, Jefferson Gomes Sodré, and Jansen Zuanon. "He leaps, she beats: The role of social interactions on the overland movements of an Amazonian amphibious killifish." Ecology of Freshwater Fish 28, no. 3 (November 23, 2018): 356–64. http://dx.doi.org/10.1111/eff.12458.

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Lehr, Edgar. "Amphibien an Einem Stillgewässer in Peru Andreas Schlüter . 2005. Amphibien an Einem Stillgewässer in Peru—mit Einer Illustrierten Checklist Der Amphibien Und Reptilien Des Unteren RÍo Llullapichis/Amphibians of an Amazonian Blackwater Pond in Peru—with Illustrated Checklist of the Amphibians and Reptiles of the Lower RÍo Llullapichis. Frankfurt am Main, Germany. Frankfurter Beiträge zur Naturkunde Band 22, Edition Chimaira. ISBN: ISBN 3-930612-51-8.. 347 €49.80 (cloth), available in Germany from www.chimaira.de ; in the USA at Bibliomania, Serpents Tale, or Zoobook Sales." Copeia 2006, no. 4 (December 2006): 834–36. http://dx.doi.org/10.1643/0045-8511(2006)6[834:aaesip]2.0.co;2.

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Vigle, Gregory O. "The Amphibians and Reptiles of the Estación Biológica Jatun Sacha in the Lowland Rainforest of Amazonian Ecuador: A 20-Year Record." Breviora 514, no. 01 (December 17, 2008): 1. http://dx.doi.org/10.3099/0006-9698-514.1.1.

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Deice Raasch-Fernandes, Livia, Solange Maria Bonaldo, Domingos de Jesus Rodrigues, Gerardo Magela Vieira-Junior, Kátia Regina Freitas Schwan-Estrada, Camila Rocco da Silva, Ana Gabriela Araújo Verçosa, Daiane Lopes de Oliveira, and Bryan Wender Debiasi. "Induction of phytoalexins and proteins related to pathogenesis in plants treated with extracts of cutaneous secretions of southern Amazonian Bufonidae amphibians." PLOS ONE 14, no. 1 (January 17, 2019): e0211020. http://dx.doi.org/10.1371/journal.pone.0211020.

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49

DE LIMA MORAES, LEANDRO JOÃO CARNEIRO, DANTE PAVAN, and ALBERTINA PIMENTEL LIMA. "A new nurse frog of Allobates masniger-nidicola complex (Anura, Aromobatidae) from the east bank of Tapajós River, eastern Amazonia." Zootaxa 4648, no. 3 (July 31, 2019): 401–34. http://dx.doi.org/10.11646/zootaxa.4648.3.1.

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The small nurse frogs of the genus Allobates (Anura, Aromobatidae) represent one of the most challenging taxonomic issues of the Neotropics. During several amphibian surveys in the Middle Tapajós River region, state of Pará, Brazil, we collected phenotypic, ecological, and molecular data on species of this genus, leading to the identification of a new species included in the Allobates masniger-nidicola complex. The new species is characterized by a large body size (snout-vent length 19.2–21.7 mm in males and 19.3–22.0 mm in females), finger III not swollen in adult males; cryptic external coloration, with dorsum uniformly ochre; a dark brown lateral stripe and a pale cream ventrolateral stripe; limbs ranging from ochre to orange; throat and chest violaceous in males and yellowish in females. The advertisement call is usually arranged in bouts of four closely spaced notes, which we term 4-pulsed units of repetition (UR), 0.317 s long on average, followed by silent intervals, and an average dominant frequency of 4.163 kHz. The new species also has exotrophic tadpoles with a unique fin morphology, which begins after the body-tail insertion and is deeper posteriorly to half of the caudal length. Sequencing of the 16S and COI regions of the mitochondrial DNA show a genetic p-distance of approximately 6–10% compared to closely related congeners. We discuss the biogeography of the new species based on phylogenetic relationships of the species within the Allobates masniger-nidicola complex and the allopatric geographic distribution in relation to sister taxa. Functional characteristics and geographic restrictions make this species particularly sensitive to the increasing human impact in eastern Amazonia.

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ANTOINE, FOUQUET, JEAN-PIERRE VACHER, ELODIE A. COURTOIS, BENOIT VILLETTE, HUGO REIZINE, PHILIPPE GAUCHER, RAWIEN JAIRAM, PAUL OUBOTER, and PHILIPPE J. R. KOK. "On the brink of extinction: two new species of Anomaloglossus from French Guiana and amended definitions of Anomaloglossus degranvillei and A. surinamensis (Anura: Aromobatidae)." Zootaxa 4379, no. 1 (February 13, 2018): 1. http://dx.doi.org/10.11646/zootaxa.4379.1.1.

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A large portion of the amphibian species occurring in Amazonia remains undescribed. A recent study on species delineation in Anomaloglossus, a genus endemic to the Guiana Shield, demonstrated the existence of two undescribed species previously identified as A. degranvillei, which we describe herein. In addition to divergence at the molecular level, these two new taxa are also distinguished by subtle morphological characters and substantial differences in the advertisement calls (note length, dominant frequency, note structure). One species occurs in the hilly lowlands of north-eastern French Guiana and is mainly distinguished from its closest relatives by a small body size (15.9–18.8 mm in males) and by vocalisations characterized by the emission of short notes of 0.09 s on average. The other species is only known from the Itoupé Massif in southern French Guiana and is mainly distinguished from its closest relatives by a moderate body size (19.4–20.4 mm in males) and by vocalisations characterized by the emission of long notes of 0.23 s on average. We also provide amended definitions for two previously described species in the A. degranvillei species group: A. degranvillei, which is endemic to a few massifs in central French Guiana, and A. surinamensis, which is distributed throughout Suriname and French Guiana. The new species described here and A. degranvillei have very narrow ranges within French Guiana and seem to have rapidly declined during the last decade. Therefore, we suggest A. degranvillei and A. dewynteri to be considered as “Critically Endangered” and A. blanci as “Vulnerable” according to the IUCN standards.

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