Description of a new species of Tatia from rio Tocantins drainage, central Brazil, with notes on Tatia simplex Mees, 1974 (Siluriformes, Auchenipteridae)

Jordson De Souza E Souza,André L Colares Canto,Luisa M Sarmento-Soares,Frank Raynner V Ribeiro

doi:10.1590/1982-0224-2019-0111

Abstract

ABSTRACT Tatia comprises twenty-five valid species, distributed in the main inland watersheds of South America, including the Orinoco, Essequibo, and coastal rivers of Suriname, Amazon, upper rio Paraná and São Francisco basins. A new species is described from tributaries of upper rio Manuel Alves on uplands of Serra Geral do Tocantins plateau, Tocantins State, Brazil. It is promptly distinguished from all congeners, except Tatia britskii, due to absence of an adipose fin. It differs from T. britskii by the longer caudal peduncle length (24.1–30.5% SL, mean 25.3 vs. 20.0–22.7, mean 20.9); caudal peduncle depth (10.9–16.8 SL, mean 14.1 vs. 9.4–10.5, mean 9.8), and anterior cranial border with mesethmoid width equals its length (vs. width approximately three times its length in T. britskii). Additionally, information regarding the poorly known species Tatia simplex originally described from rio das Mortes, is provided.

Highlights

Considering its Extent of Occurrence (EOO) and that no major scielo.br/ni | sbi.bio.br/ni threats to the species were detected in the area of distribution we suggest that T. akroa should be categorized as least concern (LC) according to the International Union for Conservation of Nature categories and criteria (IUCN, 2019)
The parieto-supraoccipital joined to middle nuchal plate, with resultant absence of an anterior nuchal plate, is a condition shared by Tatia akroa and ten species presently assigned under Tatia, namely: T. bockmanni, T. britskii, T. concolor, T. marthae, T. melanoleuca, T. musaica, T. orca, T. punctata, T. reticulata, and T. simplex
The lack of anterior nuchal plate is shared by a few Centromochlinae species (Balroglanis carolae, B. macracanthus, B. schultzi, Duringlanis romani, Ferrarissoaresia ferrarisi, and F. meridionalis) and by all Gelanoglanis species (G. stroudi, G. nanonocticolus, G. travieso, and G. pan)

Summary

Introduction

Tatia Miranda Ribeiro, 1911 is currently the most species-rich genus in Centromochlinae, comprising twenty-five valid species of small-sized catfish present in all inland South American large drainages east of the Andes, as the Orinoco basin in Venezuela and Colombia, Amazon basin from Ecuador to Brazil, coastal rivers of northern South America between the mouths of the Orinoco and Amazon rivers and upper rio Paraná and São Francisco basins (Soares-Porto, 1998; Ferraris, 2003, 2007; Sarmento-Soares, Buckup, 2005; Akama, Sarmento-Soares, 2007; Sarmento-Soares, Birindelli, 2015; Calegari et al, 2019). In the rio Tocantins drainage, Tatia is represented by two species, namely: T. intermedia (Steindachner, 1877) and T. simplex Mees, 1974 (Ferraris, 2007; SarmentoSoares, Martins-Pinheiro, 2008). Since its original description by Mees (1974) the species was kept under the name Centromochlus simplex in taxonomic lists and catalogues, with geographic distribution reported only to the type locality (e.g., Ferraris, 2003, 2007). Keept as incertae sedis in Centromochlinae (Sarmento-Soares, Martins-Pinheiro, 2008: Tab. 1), Tatia simplex appears as a valid Tatia species in recent contribution (Calegari et al, 2019)

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