A survey of new species with B chromosomes (Bs), based on a collection of 900
publications, gives an estimate of 406+ B species discovered since they were last surveyed …

The Doradidae fishes constitute one of the most diverse groups of Neotropical freshwater
environments. Acanthodoradinae is the oldest lineage and the sister group to all other …

Chromosome changes can perform an important role in speciation by acting as post-zygotic
reproductive barriers. The Neotropical electric fish genus Brachyhypopomus …

Archolaemus, one of the five genera of Neotropical freshwater fish of the family
Sternopygidae (Gymnotiformes), was long considered a monotypic genus represented by …

The diversity of Hypancistrus species in the Xingu River is remarkable and the variation in
color morphs represents a real challenge to taxonomists to delimit species boundaries. One …

Gymnotus coatesi is a small and rare species of banded knife fish that was originally
described by LaMonte in 1935, found along the main stretch of the Amazon River. There is …

The genus Gymnotus is a large monophyletic group of freshwater weakly-electric fishes, with
wide distribution in Central and South America. It has 46 valid species divided into six …

Various species and lineages that until recently were identified as Microsternarchus
bilineatus (Hypopomidae, Gymnotiformes) have a widespread distribution in the Amazon …

Archolaemus, one of the five genera of Neotropical freshwater fish of the family
Sternopygidae (Gymnotiformes), was long considered a monotypic genus represented by …

Sex determination and differentiation varies widely across vertebrates. In teleost fish these
processes are remarkably plastic. In contrast to a gonochoristic system where the sexes are …