A New Species of Chaetostoma (Siluriformes: Loricariidae) Expands the Distribution of Rubbernose Plecos Eastward into the Lower Amazon Basin of Brazil

Autor(es)

Meza-Vargas, Vanessa ; Calegari, Barbara B. ; Lujan, Nathan K. ; Ballen, Gustavo A. ; Oyakawa, Osvaldo T. ; Sousa, Leandro M. ; Py-Daniel, Lucia Rapp ; Reis, Roberto E.

• Tipo de documento: Artigo Científico
• Fonte: ICHTHYOLOGY AND HERPETOLOGY; v. 110, n. 2, p. 14-pg., 2022-07-01.

Resumo

A new species of the rubbernose pleco genus Chaetostoma is described from the Maicuru and Seiko Rivers, a northern tributary of the lower Amazon River and a tributary of the lower Xingu River, respectively, both in Para ' State, Brazil. The new species is diagnosed from all congeners, except members of the Chaetostoma anale species group, by having an enlarged second unbranched anal-fin ray with posterior paired dermal flaps. Additionally, the new species is distinguished from its only other currently recognized congeners from rivers draining the Guiana Shield (C. jegui and C. vasquezi) by having a smaller opercle and a supraoccipital excrescence undeveloped, comprising a simple skin area present in juveniles and absent in adults. A revised multi-locus phylogeny for the species of Chaetostoma is presented, and the Chaetostoma anale species group is discussed and rearranged. (AU)

• Processo FAPESP: 14/11558-5 - Peixes fósseis de água doce e biogeografia do Norte da América do Sul
• Beneficiário: Gustavo Adolfo Ballen Chaparro
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 16/02253-1 - Paleoictiologia da formação Sincelejo (Plioceno superior) no norte da Colômbia
• Beneficiário: Gustavo Adolfo Ballen Chaparro
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 11/50282-7 - Inventário da fauna de Characiformes (Teleostei, Ostariophysi) da América do Sul
• Beneficiário: Naercio Aquino Menezes
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático