RESUMO
The Boidae family is an ancient group of snakes widely distributed across the Neotropical region, where several biogeographic events contributed towards shaping their evolution and diversification. Most species of this family have a diploid number composed of 2n = 36; however, among Booidea families, the Boidae stands out by presenting the greatest chromosomal diversity, with 2n ranging between 36 and 44 chromosomes and an undifferentiated XY sex chromosome system. Here, we applied a comparative chromosome analysis using cross-species chromosome paintings in five species representing four Boidae genera, to decipher the evolutionary dynamics of some chromosomes in these Neotropical snakes. Our study included all diploid numbers (2n = 36, 40, and 44) known for this family and our comparative chromosomal mappings point to a strong evolutionary relationship among the genera Boa, Corallus, Eunectes, and Epicrates. The results also allowed us to propose the cytogenomic diversification that had occurred in this family: a process mediated by centric fissions, including fission events of the putative and undifferentiated XY sex chromosome system in the 2n = 44 karyotype, which is critical in solving the puzzle of the karyotype evolution of boid snakes.
Assuntos
Boidae/genética , Cariótipo , Animais , Evolução Biológica , Coloração Cromossômica/métodos , Cromossomos/genética , Diploide , Evolução Molecular , Cariotipagem/métodos , Filogenia , Serpentes/genéticaRESUMO
We present a description of 3 predatory anuran events by the spider Ancylometes rufus in Amapá and we present a list of the species predated by this spider genus since 2010 in Brazil. One of our predation records (Boana dentei) had not been documented yet . Our observations increase our knowledge on trophic connections between frogs and spiders.