Two new species of Curvianchoratus (Monogenoidea, Dactylogyridae) parasitizing Psectrogaster amazonica (Characiformes, Curimatidae) and a new record for Curvianchoratus singularis in the Tocantins River, Maranhao, Brazil Author Bezerra, Carine Almeida Miranda https://orcid.org/0000-0003-4842-1595 Programa de Pos-Graduacao em Ciencia Animal, Universidade Estadual do Maranhao, Cidade Universitaria Paulo VI, Avenida Lourenco Vieira da Silva 1000, 65055 - 310 Sao Luis, MA, Brazil Author Cohen, Simone Chinicz https://orcid.org/0000-0001-8204-336X Laboratorio de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, FIOCRUZ, Avenida Brasil 4365, 21040 - 900 Rio de Janeiro, RJ, Brazil scohen@ioc.fiocruz.br Author de Meneses, Yuri Costa https://orcid.org/0000-0002-8737-1159 Laboratorio de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, FIOCRUZ, Avenida Brasil 4365, 21040 - 900 Rio de Janeiro, RJ, Brazil Author Neres, Helyab Gabriel Chaves https://orcid.org/0000-0002-4454-0223 Nucleo de Estudos Morfofisiologicos Avancados, Universidade Estadual da Regiao Tocantina do Maranhao, Campus Imperatriz, Rua Godofredo Viana 1300, 65901 - 480 Imperatriz, MA, Brazil Author Viana, Diego Carvalho https://orcid.org/0000-0002-3302-9892 Nucleo de Estudos Morfofisiologicos Avancados, Universidade Estadual da Regiao Tocantina do Maranhao, Campus Imperatriz, Rua Godofredo Viana 1300, 65901 - 480 Imperatriz, MA, Brazil Author Justo, Marcia Cristina Nascimento https://orcid.org/0000-0002-0684-3389 Laboratorio de Helmintos Parasitos de Peixes, Instituto Oswaldo Cruz, FIOCRUZ, Avenida Brasil 4365, 21040 - 900 Rio de Janeiro, RJ, Brazil text ZooKeys 2023 2023-07-25 1172 101 116 http://dx.doi.org/10.3897/zookeys.1172.105500 journal article http://dx.doi.org/10.3897/zookeys.1172.105500 1313-2970-1172-101 6A0A780EB78B4E549237D01A82479F7B F73CD83EFAE05FF1B7C06633451784FC Curvianchoratus singularis (Suriano, 1980) Suriano, 1986 Notodiplocerus singularis Suriano, 1980. Syn. Host. Psectrogaster amazonica Eigenmann & Eigenmann, 1889 ( Curimatidae ) Site of infection. Gill. Locality. Embiral, rural zone ( 5°27'50"S , 47°33'48"W ), municipality of Imperatriz, Maranhao State. Infestation parameters. 29.37% prevalence; 104 total number of parasites; 2,81 ( +/- 6,3) mean intensity; 1-38 range of intensity. Type host and locality. Cyphocharax gilbert (syn. Pseudocurimata gilbert ) from Chascomus Lagoon, Buenos Aires Province, Argentina ( Suriano 1980 ). Other records. Cyphocharax voga from Chascomus Lagoon, Buenos Aires Province, Argentina ( Rossin and Timi 2016 ), Cyphocharax modestus , Cyphocharax nagelii and Steindachnerina insculpta from Batalha and Peixe Rivers, Sao Paulo State, Brazil ( Vieira et al. 2013 ; Dias et al. 2017 ). Specimens deposited. Voucher CHIOC 39990, 39991, 39992. Remarks. Suriano (1980) described the species as Notodiplocerus singularis and the original drawings are simplified lacking important details of the morphology of these unique anchors that characterize the genus. In the description provided by Rossin and Timi (2016) , the morphology of the dorsal anchor complex and copulatory complex was described in detail and illustrated by means of drawings and photographs. The morphology of the present material is in agreement with the material studied by Rossin and Timi (2016) .