Deconstructing an octogenarian misconception reveals the true Corydoras arcuatus Elwin 1938 (Siluriformes: Callichthyidae) and a new Corydoras species from the Amazon basin

Autor(es)

Tencatt, Luiz F. C. ^{[1, 2]} ; Lima, Flavio C. T. ^[3] ; Britto, Marcelo R. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Maringa, Nucleo Pesquisas Limnol Ictiol & Aquicultura, Programa Posgrad Ecol Ambientes Aquat Continentai, Maringa, Parana - Brazil

^[2] Univ Estadual Mato Grosso Sul, Lab Biol, Unidade Univ Coxim, Rua Gen Mendes de Moraes, Dourodas, Mato Grosso - Brazil

^[3] Univ Estadual Campinas Adao Jose Cardoso, Museu Zool, Inst Biol, Campinas, SP - Brazil

^[4] Univ Fed Rio de Janeiro, Inst Biol, Dept Vertebrados, Setor Ictiol, Museu Nacl, Rio De Janeiro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Fish Biology; v. 95, n. 2, p. 453-471, AUG 2019.
• Citações Web of Science: 0

Resumo

After 80 years of misidentifications, the analysis of the holotype of Corydoras arcuatus plus several non-type specimens attributed to this species allowed its recognition and also revealed a new species, both sharing the following diagnostic features: a long, arched, continuous black stripe that runs parallel to the dorsal profile of the body and extends at least from the anterior margin of the first dorsolateral body plate to the posterior portion of caudal peduncle; absence of transverse black bars on caudal fin; infraorbital 2 in contact with sphenotic and compound pterotic. In addition to these features, C. arcuatus can be distinguished from congeners by having the posterior margin of both dorsal and pectoral spines with laminar serrations directed towards their origins. The new species can be additionally distinguished from its congeners by presenting the following combination of features: ventral surface of trunk entirely or partially covered by relatively large and coalescent platelets; absence of spots or blotches on dorsal fin; and posterior margin of both dorsal and pectoral spines with serrations directed towards their tips. Finally, an identification key to all arc-striped species of Corydoras is provided. (AU)

• Processo FAPESP: 13/20936-0 - Sistemática das piabas (gêneros Hemigrammus, Hyphessobrycon, Thayeria, Parapristella e Bryconella), com ênfase nas espécies do norte da América do Sul cis-andina
• Beneficiário: Flávio César Thadeo de Lima
• Linha de fomento: Bolsas no Brasil - Apoio a Jovens Pesquisadores
• Processo FAPESP: 11/51532-7 - Sistemática das piabas (gênero Hemigrammus, Hyphessobrycon, Parapristella e Bryconella), com ênfase nas espécies do norte da América do Sul cisandina
• Beneficiário: Flávio César Thadeo de Lima
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores