Morphological and biological variations of the glass snake Ophiodes striatus (Spix, 1825) (Squamata, Anguidae) from southeastern Brazil.

Lizards of the Ophiodes genus, popularly known as glass snakes, are exclusively Neotropical. Despite their wide geographic distribution, glass snakes are poorly studied and there are many knowledge gaps in their biology and ecology to be filled. In this context, the objective of this study was to analyze possible sexual and population morphological differences of Ophiodes striatus specimens collected from different municipalities in the state of Minas Gerais, Brazil.

Histological alterations in gills of Astyanax aff. bimaculatus caused by acute exposition to zinc.

Increasing contamination of aquatic ecosystems by metals has caused various morphological, physiological and biochemical changes in aquatic organisms, and the gills of fish are recognized as indicators of environmental quality. In this context, the present work proposed to study the effects of different concentrations of zinc (Zn) in the histology of gills of yellow tail lambari (Astyanax aff. bimaculatus) after acute exposure.