| comparative liver morphology associated with the hepatosomatic index in five neotropical anuran species. | the liver is an important metabolic organ in vertebrates. in anurans, the hepatosomatic index (hsi) reflects differences in energy storage and reproductive activities between males and females. the objective of this study was to describe the histological and histometric parameters of the livers of five species of neotropical anurans, taking sex-related differences into account. we also tested how the relationship between quantitative histometric variables and hsi varied between males and females ... | 2020 | 33073492 |
| biotoxicity of diclofenac on two larval amphibians: assessment of development, growth, cardiac function and rhythm, behavior and antioxidant system. | the non-steroidal anti-inflammatory drug diclofenac (dcf) threatens the health of aquatic animals and ecosystems. in the present study, different biological endpoints (mortality, development and growth, abnormalities, cardiotoxicity, neurotoxicity and antioxidant system) were used to characterize the acute and chronic effects of dcf (at concentrations ranging between 125 and 4000 μg l-1) on two amphibian species from argentina (trachycephalus typhonius and physalaemus albonotatus). results showe ... | 2019 | 31150883 |
| differential effects of temperature on the feeding kinematics of the tadpoles of two sympatric anuran species. | temperature impacts ectotherm performance by influencing many biochemical and physiological processes. when well adapted to their environment, ectotherms should perform most efficiently at the temperatures they most commonly encounter. in the present study, we tested how differences in temperature affects the feeding kinematics of tadpoles of two anuran species: the benthic tadpole of rhinella schneideri and the nektonic tadpole of trachycephalus typhonius. benthic and nektonic tadpoles have seg ... | 2015 | 26055073 |
| systematics of ecnomiohyla tuberculosa with the description of a new species and comments on the taxonomy of trachycephalus typhonius (anura, hylidae). | ecnomiohyla tuberculosa is an amazonian hylid of uncertain phylogenetic position. herein dna sequences of mitochondrial and nuclear genes are used to determine its phylogenetic relationships. new sequences and external morphology of trachycephalus typhonius are also analyzed to assess the status of ecuadorian and peruvian populations. the phylogeny shows unequivocally that ecnomiohyla tuberculosa is nested within the genus tepuihyla, tribe lophiohylini. this position was unexpected because the r ... | 2016 | 27917043 |
| geographic variation in the advertisement call of trachycephalus typhonius anura: hylidae) based on south american samples. | previously described calls of trachycephalus typhonius (linnaeus, 1758) correspond to several populations from central and south america, but in general, these descriptions were brief and often based on a single recorded individual. here, based on an expressive sample, we re-describe the advertisement calls of t. typhonius using recordings from populations in brazil and argentina. additionally, we discuss geographical variation of calls, comment on their frequency band structure and compare call ... | 2018 | 30486155 |
| parapharyngodon n. spp. (nematoda: pharyngodonidae) parasites of hylid frogs from mexico and review of species included in the genus. | two new species of parapharyngodon chatterji, 1933 , parasitizing 3 species of hylid frogs (diaglena spatulata, triprion petasatus, and trachycephalus typhonius) from mexico are described. the 2 new species share the presence of a gubernaculum with parapharyngodon lamothei and belong to the group of those species with short spicule; both differ from the remaining species of the genus in the papillar pattern on ventrolateral and dorsal lips and in the thickness of cuticular annulations and cuticu ... | 2015 | 25496297 |
| effect of exposure to contaminated pond sediments on survival, development, and enzyme and blood biomarkers in veined treefrog (trachycephalus typhonius) tadpoles. | sediments are important elements of aquatic ecosystems and in general sediments accumulate diverse toxic substances. amphibians potentially have a greater risk of exposure to contaminants in sediments, and the test of sediments provides first lines of evidences. sediment outdoor microcosm experiments were conducted to analyze biological endpoints (survival, development, growth, and morphological and organ malformation), enzyme activity (butyrylcholinesterase, bche; glutathione-s-transferase, gst ... | 2013 | 24080097 |
| karyotype analysis of seven species of the tribe lophiohylini (hylinae, hylidae, anura), with conventional and molecular cytogenetic techniques. | few species of the tribe lophiohylini have been karyotyped so far, and earlier analyses were performed mainly with standard staining. based on the analysis of seven species with use of routine banding and molecular cytogenetic techniques, the karyotypes were compared and the cytogenetic data were evaluated in the light of the current phylogenies. a karyotype with 2n = 24 and nor in the chromosome 10 detected by ag-impregnation and fish with an rdna probe was shared by aparasphenodon bokermanni m ... | 2012 | 24260681 |
| parapharyngodon hugoi n. sp., a new nematode (oxyuroidea: pharyngodonidae) of the tree frog trachycephalus typhonius (linnaeus) from the brazilian pantanal, including a key to the congeners from amphibians of the american continent. | a new nematode parapharyngodon hugoi n. sp. (oxyuroidea: pharyngodonidae) is described parasitising the large intestine of the tree frog trachycephalus typhonius (linnaeus) (anura: hylidae) from the wetlands of pantanal, state of mato grosso do sul, brazil. the new species exhibits a unique structure of the posterior cloacal lip in males, which is supported by a rigid v-shaped structure. parapharyngodon hylidae parasitic in hylid frogs, including t. typhonius, from mexico, is the most similar co ... | 2017 | 28432565 |