A new species of Mastiglanis Bockmann 1994 (Siluriformes: Heptapteridae) from the Amazon River basin, Peru Author Faustino-Fuster, Dario R. Departamento de Ictiología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Jesús María, Lima, Perú. & Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Biologia Animal Av. Bento Gonçalves, 9500, Bloco IV, Prédio 43433, Campus do Vale, Bairro Agronomia, Porto Alegre, RS, Brasil. Author Ortega, Hernán 0000-0002-4396-2598 Departamento de Ictiología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Jesús María, Lima, Perú. & https: // orcid. org / 0000 - 0002 - 4396 - 2598 text Zootaxa 2020 2020-07-28 4820 2 323 336 journal article 8927 10.11646/zootaxa.4820.2.6 e2280d05-d091-4c28-93ae-83542929509e 1175-5326 4397729 4EAC36C3-597B-404B-9AC6-2A1FD79C658F Mastiglanis aff. asopos Brazil : Amazonas State: ANSP 196198, 1, 50.79 mm SL, Purús River, upstream from the confluence with the Amazon River, Beruri. ANSP 196199, 1, 32.2−34.2 mm SL, Amazonas River, upstream from the Purús River mouth, Anori. MCP 24207, 1, 47.2 mm SL, Amazon River between Madeira River mouth and Itacoatiara, Itacoatiaria. MCP 24468, 1, 49.1 mm SL, Amazon River, 30 km upstream from Itacoatiara, Itacoatiara. Mato Grosso State : ANSP 187247, 99, 22.9−33.7 mm SL, tributary of Cristalino River, Araguaia River, 42 km northwest from Cocalinho, MT-326 road, Corixao do Meio. MCP 33060, 1, 28.8 mm SL, arroyo Tatu, MT-423 road to a 14 km west from Cláudia, Cláudia. MCP 33692, 1, 38.7 mm SL, Ferro River, road between Novo Mato Grosso and Nova Ubiratã, 25 km to southwest from Novo Mato Grosso, Nova Ubiratã. MCP 40305, 1, 34.3 mm SL, Três stream, 30 km to south from Posto da Mata, BR 158 between Posto da Mata and Alô Brasil, Posto da Mata. Pará State: ANSP 194592, 2, 25.5−30.1 mm SL, Bacajái River, upstream from the confluence with Xingu River, Altamira. ANSP 198692, 4, 23.6−34.7 mm SL, Xingu River, Boa Esperança, 40 km southwest from Altamira, Altamira. ANSP 198739, 30, 25.8−47.6 mm SL, Xingu River, 45 km southwest from Altamira, Altamira. ANSP 198795, 2, 24.6−35.6 mm SL, Bacajaí River, tributary to Xingu River, Altamira. ANSP 199569, 4, 29.5−39.2 mm SL, Xingu River, 44 km south-west from Altamira, Altamira. ANSP 199648, 2 25.1−31.3 mm SL, Iriri River, 8 km upstream from the confluence with the Xingu River, Altamira. MCP 26882, 1, 40.5 mm SL, Igarapé São Joaquim, road between São Domingos do Capim and Belém-Brasília ( BR 010), tributary of Guamá River, São Domingos Capim. MCP 51554, 1, 52.9 mm SL, Amazon River, Sitio Pajau, Santarém. ROM 103716, 1, 35.0 mm SL, Iriri River, tributary of Xingu River, Uruará. ROM 103743, 14, 20.4−26.7 mm SL, río Iriri, tributary from Xingu River, Uruará. Rondônia State : MCP 35970, 60, 22.0− 46.8 mm SL, Igarapé S/N, tributary of Madeira River, BR-364 road, 51 km southwest from, Jaci Paraná. Guyana : Potaro-Siparuni Region : ANSP 175773, 1, 45.0 mm SL, pool isolate to 40 minutes from the main channel from Essequibo River, 15 minutes upstream from Maipuri camp, Siparuni VIII-2. ANSP 175774, 2, 34.9−35.9 mm SL, Essequibo River, 1.5 hours upstream from Maipuri camp. ANSP 177253, 4, 26.1−56.8 mm SL, Essequibo River, Essequibo . ROM 91460, 3, 28.7−45.6 mm SL, Imbaima stream, Potaro River, Essequibo River basin. ROM 91488, 1, 25.4 mm SL, Little Wailang stream, Potaro River, Essequibo River basin. ROM 97143, 1, 23.7 mm SL, Konawaruk River, Konawaruk-Essequibo River basin. ROM 97198, 1, 36.9 mm SL, Konawaruk River, Konawaruk-Essequibo River basin. Alto Demerara-Berbice Region : ANSP 177251, 17, 21.3−60.5 mm SL, Burro Burro River, Deer stream upstream from Dogs falls, Demerara . ANSP 179730, 2, 24.7−38.8 mm SL, Essequibo River, Kurukupari. Alto Takutu-Alto, Essequibo River : ANSP 179731, 1, 57.9 mm LE , Ireng River, Takutu-Branco-Negro River basin, 6.9 km southwest from Karasabai village. ANSP 179732, 25, 26.6−53.7 mm SL, Rupununi River, Kwatamang, 4 km southeast from Annai. ANSP 179733, 7, 36.9−66.8 mm SL, Takutu River, Negro River, 2.75 km west from Saint Ignatius. ANSP 179734, 1, 52.0 mm SL, Ireng River, Takutu-Branco-Negro River basin, 6.9 km southwest from Karasabai village. ANSP 179735, 7, 33.5−64.0 mm SL, Rupununi River, Karanambo ranch. ANSP 180748, 5, 29.6−50.5 mm SL, Araquai stream, Rupununi River, 77.3 km southeast from Lethem. ANSP 180950, 2, 31.1−31.6 mm SL, Takutu River, Branco-Negro River basin, 3.77 km southwest from Lethem. ANSP 197720, 2, 32.8−33.3 mm SL, Manari River, Takutu-Branco River basin, 10.2 km northeast from Lethem. ANSP 202247, 14, 36.4−66.7 mm SL, Takutu River, Branco-Negro River basin, 3.77 km southeast from Lethem. Cuyuni-Mazaruni Region , Essequibo River basin : ROM 69508, 3, 27.0− 38.3 mm SL, Mazaruni River. ROM 84034, 1, 25.6 mm SL, Semang River, Mazaruni River. ROM 84078, 1, 41.8 mm SL, Mazaruni River. ROM 86202, 26, 23.6−35.7 mm SL, Rupununi River. ROM 86402, 9, 28.8−54.3 mm SL, Rupununi River. ROM 97623, 7, 23.7−36.6 mm SL, Eping stream, Mazaruni River. ROM 97654, 2, 24.7−36.4 mm SL, Mazaruni River. ROM 101655, 3, 34.1−34.7 mm SL, Mazaruni River. ROM 101765, 11, 25.3−43.1 mm SL, Mazaruni River. ROM 101798, 47, 25.7−44.9 mm SL, Ku-rupung River, tributary of Mazaruni River. ROM 101878, 1, 40.8 mm SL, Kurupung River, tributary of Mazaruni River. ROM 101900, 4, 27.0− 38.1 mm SL, Mazaruni River. ROM 102059, 1, 26.5 mm SL, Mazaruni River. ROM 102095, 16, 26.9−40.7 mm SL, Mazaruni River. ROM 102141, 1, 39.0 mm SL, Meamu stream, Mazaruni River. ROM 102183, 3, 26.7−40.6 mm SL, Eping stream, Mazaruni River. Venezuela : Bolívar State : ANSP 160405, 1, 43.1 mm SL, Orinoco River confluence with Caura River, near to Puerto Las Majadas. ANSP 166955, 1, 41.0 mm SL, caño Chuaporío confluence with Caura River, Caura River. ANSP 166956, 2, 42.2−47.2 mm SL, Caura River, 1/ 2 miles upstream from Jabillal. ANSP 166958, 4, 34.6−41.7 mm SL, Nichare River, La Raya beach, 15-20 minutes upstream from the confluence with the Caura River. Amazonas State : Orinoco River basin : ANSP 160629, 134, 28.7−55.3 mm SL, Sipapo River, 3-4 km upstream from Pendare. ANSP 182259, 2, 50.4−54.1 mm SL, Ventuari River, beach in Picua village, 34 km from Macuruco, 104 km to east from San Fernando de Atabapo. ANSP 182653, 1, 32.0 mm SL, Manapiare River, Ventuari River, 20 km northwest from San Juan de Manapiare. ANSP 182789, 3, 39.8−46.6 mm SL, Manapiare River, Ventuari River, 10 km northwest from San Juan de Manapiare. ANSP 182973, 1, 31.8 mm SL, Manapiare River, Ventuari River, 17 km northwest from San Juan de Manapiare. ANSP 191332, 1, 50.8 mm SL, Ventuari River, upstream from the end of the extensive rocky rapid, 1 km upstream from Salto Tencua, 227 km southeast from Puerto Ayacucho, Manapiare. ANSP 191406, 2, 32.1−32.7 mm SL, caño Parhuella, upstream from bridge of Ruta 12 road, 35 km northeast from Puerto Ayacucho, Atures. ANSP 202203, 2, 41.4−56.5 mm SL, Cataniapo River, bridge main crossing and down-stream from confluence with Orinoco River, 5.6 km south from Puerto Ayacucho. ANSP 206024, 1, 28.3 mm SL, Guapuchi River, Ventuari River, 105.5 km to east from San Fernando de Atabapo. ROM 94413, 3, 40.3−46.3 mm SL, Cataniapo River.