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A new species of Kolpotocheirodon (Teleostei: Characidae: Cheirodontinae: Compsurini) from Bahia, northeastern Brazil, with a new diagnosis of the genus

2004; Biological Society of Washington; Volume: 117; Issue: 3 Linguagem: Inglês

1943-6327

Luiz Roberto Malabarba, Flávio C. T. Lima, Stanley H. Weitzman,

Fish Ecology and Management Studies

Kolpotocheirodon figueiredoi, a new species of the characid subfamily Cheirodontinae, tribe Compsurini, is described from the upper rio Paraguacu basin, Bahia, Brazil. A new diagnosis for the genus is proposed, based mostly on scanning electron microscope (SEM) analyses of the caudal organ of the new species and that of the single previously known species, Kolpotocheirodon theloura. The genus is diagnosed now in part by the presence of a previously undescribed, sexually dimorphic and apparently glandular, structure found in the lower caudal-fin lobe of males. The basal relative position of Kolpotocheirodon within the Compsurini, in which all species are inseminating, is further supported by the presence of aquasperm in both species rather than the apomorphic elongate sperm nuclei present in the remaining members of the tribe.