A new Amazonian species of Brachychalcinus (Characiformes: Characidae) from the Trombetas River basin, Brazil

Abstract

A new species of Brachychalcinus is described from the Rio Trombetas basin, Brazil. It differs from congeners by possessing a conspicuous rounded second humeral spot. Additionally, our new species differs from Brachychalcinus nummus, B. orbicularis and B. reisi by having a higher number of branched dorsal‐fin rays, and from Brachychalcinus parnaibae by having a lower head depth.

Poptella fuscata, a new Stethaprionini from the upper Amazon basin, Peru (Characiformes: Characidae)

“…Among genera of the Stethaprion Clade ( sensu Garcia‐Ayala & Benine, 2020), species of Poptella and Brachychalcinus are primarily diagnosed by the number of branched rays in the dorsal fin (species of the genus Stethaprion are differentiated by scale morphology and by presence/absence of a preventral keel; Orthospinus is monotypic). The number of branched dorsal‐fin rays differentiate species of Poptella into two groups: species with nine branched dorsal‐fin rays ( P. compressa , P. paraguayensis and P.actenolepis ) and species with 10 branched dorsal‐fin rays ( P. longipinnis and P. brevispina ).…”

“…Mirande (2018) redefined the subfamily Stethaprioninae, redimensioning it as a more inclusive clade which encompasses several characin genera grouped into four different tribes. Garcia‐Ayala and Benine (2020), therefore, used the term “ Stethaprion clade” to refer to an earlier definition of the Stethaprioninae sensu Eigenmann (1907) and Reis (1989), a monophyletic taxon formed by the genera Stethaprion Cope, Poptella Eigenmann, Brachychalcinus Boulenger and Orthospinus (Eigenmann).…”

Identificação e filogenia de novas espécies de mixozoários (Cnidaria: Myxozoa) parasitas de peixes ornamentais de ambientes naturais brasileiros

“…A exportação de peixes ornamentais da região Amazônica anualmente, corresponde a cerca de 88% dos peixes de água doce do Brasil (Gadelha, 2010;Ferreira et al 2020). Dentre os principais peixe capturados e comercializados, destaca o Symphysodon aequefasciatus Pellegrin, 1904 (Acará-discus) Segundo dados da Secretaria de Pesca do Amazonas (2019), a média de volume exportado anualmente chegou a mais 3 milhões de indivíduos.…”