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 wallacei Carvalho, Rosa & Araújo, 2016 Holotype : MZUSP 117809 ; adult female, 253 mm DW (cited as 264 mm DW in Carvalho et al. , 2016), ( Fig. 18 ); Rio Negro , municipality of Barcelos , Amazonas , Brazil , 0°57' 30.24"S , 62°56'14.697"W ; depth: not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Specimen with a cut on right portion of abdomen. Paratypes : MZUSP 10290 ; one female , 206 mm DW; vicinity of Manaus , Rio Negro , Amazonas , Brazil ; depth not listed; EPA; 15 Nov 1967 . Notes: Specimen not located. DW provided here is cited on Carvalho et al. (2016). MZUSP 19209 ; one female , 217 mm DW; Rio Negro , at mouth of Rio Cuieiras , above Manaus , Amazonas , Brazil ; depth not listed; Alpha Helix Amazon Expedition ; 01 Jan 1977 . Notes: Specimen not located. DW provided here is cited on Carvalho et al. (2016). MZUSP 104962 : RN04-07; one adult female, 210 mm DW; lake adjacent to mouth of Rio Demeni , Rio Negro , Barcelos , Amazonas , Brazil , 0°45'52.9986"S , 62°56'34.998"W ; depth not listed; M. L. G. de Araújo et al. ; 24 Feb 2004 . Notes: Digestive tract removed. One diplospondylic centrum removed. Damage on the right portion of posteroventral surface of disc. Tail broken. DW not provided in Carvalho et al. (2016). FIGURE 18. Holotype of Potamotrygon wallacei (MZUSP 107809, female, 253 mm DW) in dorsal (left) and ventral (right) views. MZUSP 104966 : N04-58; one female , 320 mm TL; Comunidade Marabá , Rio Negro , Barcelos , Amazonas , Brazil , 0°58'37.9992"S , 62°56'34.998"W ; depth not listed; M. L. G. de Araújo et al. ; 24 Feb 2004 . Notes: Specimen not located. TL is provided instead of DW in Carvalho et al. (2016). MZUSP 104977 : RN05-65; one adult male, 161 mm DW. Praia do Tabuleiro , Rio Negro , Barcelos , Amazonas , Brazil , 0°54'24.0006"S , 62°58'20.9994"W ; depth not listed; M. Domingues et al. ; 31 Jan 2005 . Notes: Cut on right portion of abdomen. Branchial chamber opened. Skin patch removed for SEM. DW is not mentioned in Carvalho et al. (2016). MZUSP 117804 : RN11-01; one female , 189 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on right portion of abdomen. Three perforations piercing the right portion of disc. DW not mentioned in Carvalho et al. (2016). MZUSP 117805 : RN11-08; one adult male, 145 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on right portion of abdomen. DW not mentioned in Carvalho et al. (2016). MZUSP 117806 : RN04-33; one adult male, 220 mm DW; Mouth of Rio Demeni , Rio Negro , Barcelos , Amazonas , Brazil , 0°46'31.8"S , 62°56'14.28"W ; depth not listed; F. Marques et al. ; 26 Feb 2004 . Notes: Cut on right portion of abdomen. Skin patch removed for SEM. DW not mentioned in Carvalho et al. (2016). MZUSP 117807 : RN11-13; one adult female, 241 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth: not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on right portion of abdomen. Tail broken. Discolouration on right posterodorsal portion of disc. DW not mentioned in Carvalho et al. (2016). MZUSP 117808 : RN11-15; one adult female, 205 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on the right portion of abdomen; ventral caudal stinger removed; dorsal stinger broken. Tail broken. DW not provided in Carvalho et al. (2016). MZUSP 117810 : RN11-20; one adult female, 222 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on right portion of abdomen. DW not mentioned in Carvalho et al. (2016). MZUSP 117811 :RN11-06; one adult female, 234mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on portion of abdomen. Discolouration on posterodorsal surface of disc, with scars. Tail partially damaged. DW not mentioned in Carvalho et al. (2016). MZUSP 117812 : RN11-30; one adult male, 206 mm DW; Rio Negro , Barcelos , Amazonas , Brazil , 0°57'30.24"S , 62°56'14.697"W ; depth not listed; F. Marques et al. ; 09 Jan 2011 . Notes: Cut on right portion of abdomen. Desquamation on left portion of disc. Tail partially damaged. DW not mentioned in Carvalho et al. (2016).