Oligosarcus perdido (Characiformes, Characidae), a new species of freshwater fish from Serra da Bodoquena, upper Rio Paraguai basin, Brazil.
Author
Alexandre C. Ribeiro
Author
Marcel R. Cavallaro
Author
Otávio Froehlich
text
Zootaxa
2007
1560
43
53
http://www.zoobank.org/urn:lsid:zoobank.org:pub:3779DDFF-75D8-49AF-96C8-18942ED78EE2
journal article
z01560p043
3779DDFF-75D8-49AF-96C8-18942ED78EE2
[[
Oligosarcus
]]
The genus
Oligosarcus
consists of 16 previously described species (Menezes, 1969a; Menezes, 1987; Miquelarena & Protogino, 1996), distributed throughout most of the main hydrographic systems of cisAndean South America below 14º of latitude (Menezes, 1988). This wide distributional range includes the Bolivian and Argentinean Andean highlands, the Brazilian crystalline shield, and the Atlantic slope drainages of eastern and southern South America (Menezes, 1988). Species of
Oligosarcus
are typically small-to medium sized predators on arthropods and other fishes, inhabiting mainly smaller tributaries of the main river basins (Menezes, 1969b; Aranha et. al, 1998; Casatti, 2003; Hermes-Silva et al., 2004).
Menezes (1987) provided a comprehensive review of the previous known species and described three new ones. The latest addition to the genus was made by Miquelarena & Protogino (1996) in describing
Oligosarcus menezesi
. No intraspecific phylogenetic information on this genus has been already provided; however, the presence of tricuspid teeth along most of ectopterygoid length, a unique feature among a set of genera presently assigned as incertae sedis in Characidae (Lima et al, 2003), suggests that the genus consists of a monophyletic group. The phylogenetic relationships and biogeography of
Oligosarcus
are currently under study by one of the authors (ACR).