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
Summary
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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