Gephyrocharax machadoi, a new species of Stevardiinae (Characiformes: Characidae) from the Rio Paraguai basin, central Brazil

Autor(es)

Ferreira, Katiane M. ^[1] ; De Faria, Erika ^[2] ; Ribeiro, Alexandre C. ^[1] ; Santana, Julio C. O. ^[3] ; Quagio-Grassioto, Irani ^[4] ; Menezes, Naercio A. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Fed Mato Grosso, Inst Biociencias, Dept Biol & Zool, Lab Ictiol, Av Fernando Correia da Costa 2367, BR-78060900 Cuiaba, MT - Brazil

^[2] Univ Fed Mato Grosso, Programa Posgrad Ecol & Conservacao Biodiversidad, Cuiaba, MT - Brazil

^[3] Univ Estadual Campinas, Inst Biol, R Monteiro Lobato 255, Cidade Univ, BR-13083862 Campinas, SP - Brazil

^[4] Univ Estadual Paulista, Inst Biociencias, Dept Morfol, Caixa Postal 510, BR-18618000 Botucatu, SP - Brazil

^[5] Univ Sao Paulo, Museu Zool, Caixa Postal 42694, BR-04299970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; v. 4415, n. 1, p. 161-172, APR 27 2018.
• Citações Web of Science: 0

Resumo

Gephyrocharax machadoi, new species, is described from tributaries of the rio Sepotuba, upper rio Paraguai basin, Mato Grosso state, Brazil. The new species is distinguished from its congeners, except Gephyrocharax major, by presenting two modified scales on the ventral caudal-fin lobe (pouch scales): a larger, sexually dimorphic scale, slightly superior and anterior in position, followed by a smaller, posterior and ventrally placed accessory scale (vs. a single modified pouch scale without ventrally placed accessory scales). Gephyrocharax machadoi differs from G. major by presenting a gap (more conspicuous in mature males than in mature females) between the second and third ventral procurrent caudal-fin rays (vs. second and third ventral procurrent caudal-fin rays near each other or fused distally); premaxilla with tricuspid teeth (vs. tetra-to pentacuspid teeth); and body depth 21.5-25.4% of SL (vs. 25.9-36.8% in SL). Spermiogenesis and spermatozoa morphology are also described. (AU)

• Processo FAPESP: 07/52756-0 - Estudo das relações filogenéticas da tribo Diapomini (Characiformes: Characidae) e caracídeos inseminadores (Incertae sedis), baseado em caracteres osteológicos, anatômicos e histológicos
• Beneficiário: Katiane Mara Ferreira
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado