A new species of the catfish genus Trichomycterus from the La Plata River basin, southern Brazil, with comments on its putative phylogenetic position (Siluriformes: Trichomycteridae)

Autor(es)

Datovo, Alessio ^{[1, 2]} ; Carvalho, Murilo ^[1] ; Ferrer, Juliano ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, LIRP, FFCLRP, Dep Biol, PPG Biol Comparada, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] MZUSP, Lab Ictiol, BR-04263000 Sao Paulo - Brazil

^[3] Univ Fed Rio Grande do Sul, Dept Zool, Programa Posgrad Biol Anim, BR-91501970 Porto Alegre, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Zootaxa; n. 3327, p. 33-44, MAY 29 2012.
• Citações Web of Science: 14

Resumo

The genus Trichomycterus is a highly diverse group of Neotropical catfishes that encompass almost 60% of all the currently recognized species of the Trichomycteridae. A new species of this genus, T. perkos, is herein described from tributaries of the Paranapanema and Uruguai River basins, southern Brazil. The new species exhibits a remarkable ontogenetic change in its pigmentation, having a unique color pattern when adult. The adult pigmentation consists of three wide dark brown stripes, located in an inner skin layer of trunk and caudal peduncle, combined with a superficial light brown freckled pattern on the dorsum and caudal peduncle. Small, presumably juvenile specimens lack the superficial freckles but already have the dark stripes, thus resembling the color pattern of a few other congeners. Nevertheless, several unequivocal morphological features distinguish both juveniles and adults of T. perkos from these congeners. In spite of the difficulties in estimating phylogenetic relationships within Trichomycterus, the new species is tentatively proposed as being the sister-taxon of a small group of species composed by T. crassicaudatus, T. igobi, and T. stawiarski. (AU)

• Processo FAPESP: 04/09219-6 - Relações filogenéticas em Characidae (Ostariophysi: Characiformes)
• Beneficiário: Ricardo Macedo Corrêa e Castro
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 10/18984-9 - Miologia branquial ventral de Teleostei (Osteichthyes: Actinopterygii)
• Beneficiário: Aléssio Datovo da Silva
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/54931-0 - Melhoria e capacitação das coleções científicas do Departamento de Biologia da Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo
• Beneficiário: Carlos Alberto Garofalo
• Linha de fomento: Auxílio à Pesquisa - Programa Infra-estrutura - Acervos biológicos