Occurence of Characidium xavante (Characiformes: Crenuchidae) in the Tapajós River basin and comments about the conservation status of the species.

Weferson J Da Graça,Hugmar P Da Silva,Augusto Frota,Rodrigo P Barcelos,Izaias M Fernandes

doi:10.1590/0001-3765202120210281

Abstract

Characidium xavante was described from two tributaries of the Culuene River drainage, in the upper Xingu River basin. New samplings recorded the species for streams from the Kaaiapó River drainage (Teles Pires River drainage, upper Tapajós River basin) with additional specimens also recorded in the Xingu River basin, Paranatinga municipality, Mato Grosso State, Brazil. The new records represent an extension of the geographical distribution of the species, that from now on fits in a pattern of distribution known to be shared with other ca. 20 species of fishes. We suggest that Characidium xavante could be classified as Least Concern (LC), according to the International Union for Conservation of Nature Standards and Petitions Committee (IUCN).

Highlights

Characidium xavante Graça, Pavanelli & Buckup, 2008 was described based on 156 specimens from two streams of the Culuene River drainage, upper Xingu River basin
Recent samplings revealed the presence of Characidium xavante in the Kaaiapó River drainage (Tapajós River basin) and in the Capitão Noronha River drainage (Xingu River basin) (Figure 1)
We register the occurrence of Characidium xavante to the Tapajós River basin and expand the geographical distribution within the Xingu River basin

Summary

INTRODUCTION

Characidium xavante Graça, Pavanelli & Buckup, 2008 was described based on 156 specimens from two streams of the Culuene River drainage, upper Xingu River basin. Citations of the species remains restricted to the Culuene River drainage in the upper Xingu River basin (Dagosta & de Pinna 2019, Fricke et al 2021). Recent samplings revealed the presence of Characidium xavante in the Kaaiapó River drainage (Tapajós River basin) and in the Capitão Noronha River drainage (Xingu River basin) (Figure 1). We register the occurrence of Characidium xavante to the Tapajós River basin and expand the geographical distribution within the Xingu River basin. The headwaters of the Kaaiapó and Capitão Noronha River drainages are localized in the region between the mountains of Roncador and Formosa (Mato Grosso State, Brazil), draining, respectively, to the upper Teles Pires River drainage (upper Tapajós River basin) and Ronuro River drainage (upper Xingu River basin). Four streams of the Kaaiapó River drainage and three streams of the Capitão Noronha River drainage were sampled (Figure 2; Table I)

Characidium xavante IN THE TAPAJÓS RIVER BASIN

Author contributions