Brazil hosts one of the world's most diverse reptilian faunas, with over 800 species distributed across its various biomes. This paper examines the historical development of herpetological research in Brazil, particularly focusing on two pioneering institutions: the Vital Brazil Institute and the Butantan Institute. These centers have been instrumental in both the scientific study of reptiles and the development of antivenoms since the early 20th century. We explore the remarkable morphological adaptations of Brazilian reptiles across different biomes, from the Amazon rainforest to the Caatinga desert, highlighting how these adaptations reflect the country's diverse ecological pressures. This review synthesizes current knowledge while identifying gaps in our understanding of Brazilian herpetofauna.

This study presents two interconnected mathematical models: one describing the stability and bifurcation dynamics of ecological biomes, and another simulating the progressive deformation and structural failure of a toroidal object. Both models explore topological changes in complex systems, bridging concepts from ecology, materials science, and mathematical physics. The first part introduces a dynamic model of ecological biomes, incorporating seasonal oscillations and external pressures. We define equations for topology updates, seasonal effects, and pressure impacts, culminating in a bifurcation condition that represents a critical shift in the biome's equilibrium state. This model provides insights into the resilience and tipping points of ecological systems under varying environmental stresses.The second part extends these concepts to a three-dimensional toroidal structure. We present parametric equations describing the torus geometry and develop a time-dependent deformation model that includes both stochastic and deterministic elements. A novel twisting deformation component enhances the realism of the structural changes. We define a critical threshold for maximum displacement, beyond which the torus undergoes structural failure, analogous to the bifurcation point in the biome model. Both models are implemented computationally, providing visual representations of the systems' evolution over time. The biome model illustrates the path to and consequences of bifurcation, while the torus simulation depicts the stages of deformation leading to structural break. This work contributes to the understanding of topological changes and critical transitions in both ecological and physical systems. By presenting these models in parallel, we highlight the universal nature of stability, bifurcation, and failure across different domains. The methodologies presented here have potential applications in ecology, materials science, structural engineering, and theoretical physics, offering a framework for studying the limits of system integrity under stress.

Brazil harbors one of the world’s richest amphibian faunas, with over 1,000 described species exhibiting remarkable morphological diversity. This review synthesizes current knowledge of amphibian morphological variation across Brazilian biomes, analyzing patterns of phenotypic diversity in relation to habitat type, life history strategies, and phylogenetic relationships. Our analysis reveals distinct morphological adaptations associated with specific microhabitats within major biomes, from the arboreal specialists of the Atlantic Forest to the fossorial species of the Cerrado. We identify several morphological convergence patterns among distantly related taxa occupying similar ecological niches, particularly in traits related to locomotion and reproductive modes. The study highlights previously undocumented morphological variations in several species complexes and describes novel anatomical features in recently discovered taxa. These findings contribute to our understanding of amphibian evolution in megadiverse tropical regions and have important implications for conservation strategies targeting morphologically unique populations.

Abstract

The morphological diversity of New World monkeys (Platyrrhini) across Brazilian biomes represents a remarkable example of adaptive radiation in Neotropical primates. This review synthesizes current knowledge about morphological adaptations and distribution patterns of platyrrhine primates across Brazil's major biomes, focusing on the relationship between form and function in different ecological contexts. Through analysis of recent geometric morphometric studies, ecological surveys, and comparative anatomical research, we identify several key patterns of morphological variation, including: a continuous gradient of postcranial adaptations rather than discrete locomotor categories, unexpected variations in temporal bone architecture across forest strata, and rapid morphological responses to local dietary conditions as evidenced by dental morphology. Our synthesis reveals that morphological adaptation in Brazilian platyrrhines involves complex trade-offs between competing functional demands, with different anatomical systems evolving at varying rates. The relationship between morphological specialization and ecological resilience emerges as particularly significant, with implications for conservation strategies in the face of habitat modification and climate change. We demonstrate that traditional views of morphological adaptation as a gradual process require revision, as populations show capacity for relatively rapid morphological responses to environmental changes. These findings have important implications for both evolutionary theory and conservation practice, suggesting the need for approaches that preserve not just species, but the full spectrum of morphological diversity and the ecological contexts that generate and maintain it.