title: Rediscovery of the holotype of Tetragonopterus vittatus Castelnau 1855, a senior synonym of Moenkhausia doceana (Steindachner 1887) (Characiformes: Characidae).
abstract: The description of Tetragonopterus vittatus presented by Francis L. Castelnau (1855) was very concise and apparently based on a single specimen (not explicitly stated in the text, but deducible according to the single counts for the meristic data presented in the description). The type locality is recorded simply as "Bahia", with no specification of the drainage or nearby city. The existence of type specimens has been considered unknown (Lima et al., 2003; Eschmeyer & Fricke, 2015; Lucena & Soares, 2016), and have not been mentioned in published catalogues for type specimens of MNHN (e.g. Bertin, 1948).
authors.affiliation: Universidade Federal do Rio Grande do Sul, Departamento de Zoologia, Programa de pós graduação em Biologia Animal, Laboratório de Ictiologia. Avenida Bento Gonçalves, 9500, prédio 43435, sala 104, Porto Alegre, Rio Grande do Sul, Brazil.; Email: pricarola@gmail.com.
authors.forename: Priscilla Caroline
authors.initials: PC
authors.lastname: Silva
authors.affiliation: Laboratório de Ictiologia. Avenida Bento Gonçalves, 9500, prédio 43435, sala 104, Porto Alegre, Rio Grande do Sul, Brazil.; Email: malabarb@ufrgs.br.
authors.forename: Luiz Roberto
authors.initials: LR
authors.lastname: Malabarba
mesh_terms: D000825:Animal Structures / Q000033:anatomy & histology; D000818:Animals; D060126:Characidae / Q000033:anatomy & histology / Q000145:classification*