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| Baryancistrus isaaci Baryancistrus quilombola Oliveira & Rapp Py-Daniel, 2025 |
Abstract
Two new species of Baryancistrus are described from the rio Trombetas basin. These new species were collected in the late 1980’s and were analyzed morphologically and compared to the eight currently assigned species of Baryancistrus. Both new species are distinguished from their congeners by a set of non-unique characters, such as coloration, extension of dorsal-fin membrane, abdominal covering, number of mandibular teeth and size of fins. These new species are only registered for strong-energy and clear waters, powerful cataracts, with rocky substrates, being sometimes, syntopic. The patterns of distribution and morphological features among all Baryancistrus species are discussed, and an identification key is presented. Despite of occurring in a protected area, previous studies on hydroelectric plants for the rio Trombetas, as the Hydropower Plant of Cachoeira Porteira, are being re-examined by current authorities, raising deep concerns on the future conservation of the unique biodiversity of the rio Trombetas basin.
Keywords: Amazon; Conservation; Freshwater; Hydroelectric; Identification key
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| Baryancistrus isaaci, uncatalogued specimen, from Cachoeira da Enseada, Baryancistrus quilombola, INPA-ICT 52435, paratype, 119.4 mm SL, from rio Trombetas, Oriximiná, Pará, Brazil. Photos: Douglas A. Bastos. |
Baryancistrus isaaci, new species
Etymology. The specific name, a noun (masculine, singular), honors Isaäc Isbrücker, for his contribution to the knowledge of Neotropical Ichthyology, especially loricariids. Isaäc is an excellent ichthyologist and aquarist, and an example of resilience against preconceived ideas, deserving to be honored by his extreme talent and knowledge on loricariids. He has dedicated a relevant part of his career as ichthyologist sharing his knowledge with the academia and general aquarium experts. A noun in a genitive case.
Baryancistrus quilombola, new species
Etymology. The specific name quilombola (a noun in the nominative singular standing in apposition to the generic name) honors the Quilombola’s communities of the rio Trombetas, also called Quilombos. Quilombolas are Afro-Brazilian descendents that escaped from slavery, or after abolition of slavery, that organized agrarian communities according to cultural, religious and geographic backgrounds in different areas in Brazil. The presence of large quilombos in the Amazon and, particularly, in the rio Trombetas basin deserves recognition, as the first Quilombo fully recognized by the Brazilian government was in rio Trombetas (Duque, 2009). They are eximious fishermen and profound connoisseurs of the dangerous waters in the rio Trombetas, as well as important activists of the Quilombola cause in South America.
Renildo Ribeiro de Oliveira and Lúcia H. Rapp Py-Daniel. 2025. Two New Species of the ornamental loricariid Genus Baryancistrus (Siluriformes: Hypostominae) from rio Trombetas Basin, Pará, Brazil. Neotrop. ichthyol. 23 (03); DOI: doi.org/10.1590/1982-0224-2025-0066
