First Cytogenetical Studies in Characidium Species (Pisces: Characiformes, Characidiinae).

Origin of B chromosomes in Characidium alipioi (Characiformes, Crenuchidae) and its relationship with supernumerary chromosomes in other Characidium species

B chromosomes are apparently dispensable components found in the genomes of many species that are mainly composed of repetitive DNA sequences. Among the numerous questions concerning B chromosomes, the origin of these elements has been widely studied. To date, supernumerary chromosomes have been identified in approximately 60 species of fish, including species of the genus Characidium Reinhardt...

New species of Characidium (Characiformes: Crenuchidae) from the Rio Tapajós and Rio Xingu drainages, Pará, Brazil.

Characidium nana is described from the Rio Xingu and Rio Tapajós drainages. The new species is distinguished from all its congeners by the absence of the inner series of dentary teeth, the absence of the parietal branch of the supraorbital laterosensory canal, the incomplete lateral line, the lack of an adipose fin, the presence of a conspicuous dark blotch on caudal peduncle as well as an evid...

Cytogenetic analyses of two Curimatidae species (Pisces; Characiformes) from the Paranapanema and Tietê Rivers.

Cytogenetic analyses were performed in two Curimatidae species (Steindachnerina insculpta and Cyphocharax modesta) from the Paranapanema and Tietê Rivers (São Paulo State, Brazil), showing a karyotype composed of 54 meta-submetacentric chromosomes in both species. Silver- and chromomycyn-staining and fluorescent in situ hybridization (FISH) using a 18S rDNA probe indicated that the nucleolar or...

Cytogenetical studies on swine intersexes.

Systematics of the Neotropical Characiform Genus Curimata Bosc (Pisces: Characiformes)

Vari, Richard P. Systematics of the Neotropical Characiform Genus Curimata Bosc (Pisces: Characiformes). Smithsonian Contributions to Zoology, number 474, 63 pages, 42 figures, 5 tables, 1989.—The genus Curimata Bosc (1817) is recognized as a monophyletic subunit of the family Curimatidae on the basis of a variety of synapomorphies in the gill arches, buccopharyngeal complex, and palatine arch....