Type specimens of Elasmobranchii in the Museu de Zoologia da Universidade de São Paulo (MZUSP) Author Lima, Arthur De Museu de Zoologia da Universidade de São Paulo, Av. Nazaré 481, São Paulo, SP 04263 - 000, Brazil. Author Loboda, Thiago Silva Departamento Acadêmico de Ensino (DAENS), Universidade Tecnológica Federal do Paraná, Avenida Monteiro Lobato, s / n Jardim Carvalho, Ponta Grossa, PR 84016 - 210, Brazil. Author Gianeti, Michel Donato Museu de Zoologia da Universidade de São Paulo, Av. Nazaré 481, São Paulo, SP 04263 - 000, Brazil. Author Silva, João Paulo Capretz Batista Da Departamento de Sistemática e Ecologia, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, Castelo Branco, João Pessoa, PB 58051 - 900, Brazil. Author Pinna, Mario De Museu de Zoologia da Universidade de São Paulo, Av. Nazaré 481, São Paulo, SP 04263 - 000, Brazil. text Zootaxa 2023 2023-05-29 5296 3 301 332 http://dx.doi.org/10.11646/zootaxa.5296.3.1 journal article 10.11646/zootaxa.5296.3.1 1175-5326 7983829 4B889879-03B7-4373-A5AF-D3B807AAEF72 Potamotrygon amazona Fontenelle & Carvalho, 2017 Holotype : MZUSP 117344 ; adult male, 518 mm DW (cited as 532 mm in Fontenelle & Carvalho, 2017 ) ( Fig. 11 ); Rio Jutaí , municipal district of Boca do Titica , upper Rio Amazonas , Amazonas state, Brazil , 2º55’24.8’’S , 66º57’07.6’’W ; depth not listed; F. Marques et al. ; 24 Sep 2012 . Notes: Skin patches removed on ventral surface, with a cut on the right portion of abdomen. Field no. JU12- 10. Paratypes : MZUSP 117346 : JU12-12; one adult female, 402 mm DW (approximately the same DW as cited in Fontenelle & Carvalho, 2017 ); Rio Jutaí , municipal district of Boca do Titica , upper Rio Amazonas , Amazonas state, Brazil , 2º55’24.8’’S , 66º57’07.6’’W ; depth not listed; F. Marques et al. ; 25 Sept 2012 . Notes: Skin samples close to eyes removed for SEM. Skin partially removed on ventral surface. MZUSP 117348 : JU12-19; one adult male, 495 mm DW (approximately the same DW as cited in Fontenelle & Carvalho, 2017 ); Rio Jutaí , municipal district of Boca do Titica , upper Rio Amazonas , Amazonas state, Brazil , 2º55’24.8’’S , 66º57’07.6’’W ; depth not listed; F. Marques et al. ; 25 Sep 2012 . Notes: Cut on right portion of abdomen.