A new species of Moenkhausia (Characiformes: Characidae) from the rio Madeira basin, Brazil, with comments on the evolution and development of the trunk lateral line system in characids

Autor(es)

Ferreira Marinho, Manoela Maria ^[1] ; Ohara, Willian Massaharu ^[2] ; Paiva Dagosta, Fernando Cesar ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Paraiba, Dept Sistemat & Ecol, Cidade Univ S-N, BR-58051900 Joao Pessoa, Paraiba - Brazil

^[2] Univ Fed Rondonia, Lab Ciencias Ambientais, Av Paz 4376, BR-76916000 Presidente Medici, RO - Brazil

^[3] Fundacao Univ Fed Grande Dourados, Fac Ciencias Biol & Ambientais, Rodovia Dourados Itahum, Km 12, BR-79804970 Dourados, MS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 19, n. 2 2021.
• Citações Web of Science: 0

Resumo

Abstract A new species of Moenkhausia is described from the rio Machado drainage, Amazon basin, Brazil. It is diagnosed from congeners by its color pattern, consisting of the concentration of chromatophores on the anterior portion of body scales, the horizontally elongate blotch on caudal peduncle, a bright golden coloration of the dorsal portion of eye when alive, and a dark line crossing the eye horizontally. The new species has variable morphology regarding trunk lateral-line canals. Most fully grown individuals do not have enclosed bony tube in many lateral line scales, resembling early developmental stages of tube formation of other species. This paedomorphic condition is interpreted as a result of developmental truncation. Such evolutionary process may have been responsible for the presence of distinct levels of trunk lateral line reductions in small characids. Variation in this feature is common, even between the sides of the same individual. We reassert that the degree of trunk lateral-line tube development must be used with care in taxonomic and phylogenetic studies, because reductions in the laterosensory system may constitute parallel loss in the Characidae. We suggest the new species to be categorized Near Threatened due to the restricted geographical distribution and continuing decline in habitat quality. (AU)

• 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
• Processo FAPESP: 17/09321-5 - Characiformes miniaturas (Teleostei: Ostariophysi): evolução, diversidade e biogeografia
• Beneficiário: Manoela Maria Marinho Koh
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Jovens Pesquisadores
• Processo FAPESP: 13/22473-8 - Endemismo e análise biogeográfica dos peixes da Bacia do Rio Madeira
• Beneficiário: Willian Massaharu Ohara
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/19075-9 - Diversidade e evolução de Gymnotiformes (Teleostei, Ostariophysi)
• Beneficiário: Naercio Aquino Menezes
• Modalidade de apoio: Auxílio à Pesquisa - Temático