A new species of Chaetostoma (Siluriformes: Loricariidae) from the Orinoco basin with comments on Amazonian species of the genus in Colombia

Autor(es)

Urbano-Bonilla, Alexander ; Ballen, Gustavo A.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Fish Biology; v. 98, n. 4, p. 14-pg., 2021-01-07.

Resumo

Chaetostoma chimu sp. nov. is described from 119 specimens collected in the Andean foothills of the Orinoco River in Colombia. The new species can be distinguished from congeners by a combination of characters, including shape of cheek odontodes, presence of a supraoccipital excrescence, sexual dimorphism characters and colour pattern. In addition, this species can be distinguished from the sympatric and geographically close congeners of the Orinoco that have curved cheek odontodes (i.e., Chaetostoma anale, Chaetostoma formosae and Chaetostoma joropo), by presenting a generally larger orbital diameter and interorbital distance, details of sexual dimorphism and colour pattern. The type locality of specimens collected by Kjell von Sneidern in the mid-twentieth century in the Colombian Amazon is also clarified. Chaetostoma alternifasciatum and Chaetostoma vagum are proposed as junior synonyms of C. anale. An identification key for the species of Chaetostoma from cis-Andean drainages in Colombia is provided. The new species is herein categorized as Vulnerable (Vu) B1a (i, iii), following the IUCN criteria. (AU)

• 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: 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: 16/19075-9 - Diversidade e evolução de Gymnotiformes (Teleostei, Ostariophysi)
• Beneficiário: Naercio Aquino Menezes
• Modalidade de apoio: Auxílio à Pesquisa - Temático