Abstract

Abstract A new species of Rhyacoglanis is described from the rapids of Jatobal, Pará State, Brazil. This species differs from the congeners by fusing hypurals 3, 4, and 5 (vs. hypural 5 free). It also differs from the other species, except for Rhyacoglanis epiblepsis, by the color pattern with numerous dark spots on the body, short post-cleithral process, rounded pectoral and caudal fins, and incomplete lateral line. This species is known only from the type locality, which is currently flooded by the Tucuruí reservoir.

Highlights

  • Rhyacoglanis Shibatta & Vari, 2017, consists of five small bumblebee catfish species (Shibatta, Vari, 2017)

  • Three species are known from the Amazon region: Rhyacoglanis pulcher (Boulenger, 1887) from the upper rio Amazonas, R. epiblepsis Shibatta & Vari, 2017 from rio Madeira, and R. seminiger Shibatta & Vari, 2017 from the upper rio Tapajós

  • The analysis of specimens from the lower rio Tocantins in Pará highlighted a new species from the rapids of Jatobal, a region flooded by the Tucuruí reservoir

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Summary

Introduction

Rhyacoglanis Shibatta & Vari, 2017, consists of five small bumblebee catfish species (Shibatta, Vari, 2017). They are recognized by the body’s color pattern that alternates dark brown bands on a yellowish background, grayish head with a light spot on the cheek, a dark stripe along the middle of the upper and lower caudal-fin lobes confluent with dark caudal peduncle blotch, lateral line elongated, and premaxillary tooth plate posterolaterally pointed. The analysis of specimens from the lower rio Tocantins in Pará highlighted a new species from the rapids of Jatobal, a region flooded by the Tucuruí reservoir.

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