Glanidium botocudo, a new species from the rio Doce and rio Mucuri, Minas Gerais, Brazil (Siluriformes: Auchenipteridae) with comments on taxonomic position of Glanidium bockmanni Sarmento-Soares & Buckup

Abstract

1Glanidium botocudo, new species, is described from the tributaries to the upper rio Doce and Mucuri, eastern Minas Gerais State, Brazil. It represents the northernmost record of a centromochlin catfish from the coastal rivers of the Northeastern Atlantic Forest. Glanidium botocudo is readily distinguished from its congeners, except Glanidium albescens, by the whitish grey body coloration with evenly spaced small dark brown dots. The new species has a long sharpened ventral process on the urohyal, an uncommon condition among congeners, and the lowest vertebral count among the large-sized Glanidium, 36-37. It differs from Glanidium albescens by proportional measurements and higher number of ribs. Glanidium botocudo and Glanidium albescens are probably sister species, exhibiting similar morphological features and a complimentary distribution pattern, associated to an allopatric distribution pattern. Glanidium bockmanni is transferred to the genus Centromochlus.Glanidium botocudo, espécie nova, é descrita para tributários do alto rio Doce e rio Mucuri, leste de Minas Gerais, Brasil. Representa o registro mais ao norte de um bagre centromoclíneo nos rios do Nordeste da Mata Atlântica. Glanidium botocudo é prontamente distinguido de todos seus congêneres, exceto Glanidium albescens, pelo colorido cinza-esbranquiçado do corpo com máculas castanho-escuras regularmente espaçadas. A espécie nova apresenta processo ventral do uro-hial longo e afilado, uma condição incomum entre os congêneres, e ainda a menor contagem vertebral entre os Glanidium de grande porte, 36-37. Diferencia-se de Glanidium albescens por proporções corporais e maior número de costelas. Glanidium botocudo e Glanidium albescens são possivelmente espécies irmãs, apresentando características morfológicas similares e padrões de distribuição complementar, associados a um padrão de distribuição alopátrica. Glanidium bockmanni é transferido para o gênero Centromochlus.

Length-weight relationship of 21 fish species from Rio Doce River basin, Minas Gerais, Brazil

“…There are four species that should be carefully treated, this is due to the small sample size and/or small R 2 value (<0.95): A. lacustris , G. botocudo , H. wheatlandii and P. vetula . We choose to add these species, once they are rarity, endemic and/or lack of LWR data (Vieira, Alves, & Santos, ; Sarmento‐Soares & Martins‐Pinheiro, ; Pereira, Pablo, & Reis, ; Froese & Pauly, ).…”

A new species of Centromochlus (Siluriformes, Auchenipteridae, Centromochlinae) from the middle Rio Tocantins basin, Brazil

“…Two species were more recently described in Centromochlus , Centromochlus macracanthus Soares‐Porto 2000 and Centromochlus meridionalis Sarmento‐Soares, Cabeceira, Carvalho, Zuanon & Akama 2013. In addition, two species were recently transferred to Centromochlus : Glanidium bockmanni Sarmento‐Soares & Buckup 2005 (Sarmento‐Soares & Martins‐Pinheiro, ) and Tatia simplex Mees 1974 (Sarmento‐Soares & Birindelli, ). Currently, a total of 13 species are considered valid in Centromochlus ; the type species of the genus, Centromochlus megalops , is considered as a species inquirendae (Ferraris, ).…”