A new species of <i>Characidium</i> Reinhardt (Characiformes: Crenuchidae) from the Río Huallaga, central Peruvian Amazon, with a review of secondary sexual characters in the genus
Túlio F. Teixeira, Marcelo Roberto Souto de Melo
Abstract
Abstract Characidium pumarinri n. sp. is described from the affluents of Río Huallaga, a tributary of Río Marañón that drains the eastern slopes of the Andes, in the Peruvian Amazon. The new species has a deep body (24–31% in L S ), 11–17 well‐marked dark bars and remarkable sexual dimorphism related to colour pattern, in which males have darker anal, dorsal, pectoral and pelvic fins than females. C. pumarinri resembles some species allocated in Clade C4, mainly by having a high number of transversal bars and a deep body. In addition, a thorough review and further descriptions of the secondary sexual characteristics in Characidium are provided.
Topics & Concepts
CharaciformesBiologyAmazon rainforestSexual dimorphismZoologyCladeAmazon basinGenusEcologyFisheryPhylogeneticsFish <Actinopterygii>GeneBiochemistryFish biology, ecology, and behaviorFish Biology and Ecology StudiesFish Ecology and Management Studies