-57.366665, -5.7: 10 Treatments

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Marmosops (Sciophanes) marina   sp. nov.  Ferreira, Claudilívia, Oliveira, Ana Cristina Mendes De, Lima-Silva, Luan Gabriel & Rossi, Rogério Vieira, 2020, Taxonomic review of the slender mouse opossums of the “ Parvidens ” group from Brazil (Didelphimorphia: Didelphidae: Marmosops), with description of a new species, Zootaxa 4890 (2), pp. 201-233: 208-221 208-221
Characiformes   new species  Moreira, Cristiano R. & Lima, Flávio C. T., 2017, Thayeria tapajonica (Characiformes: Characidae), a new species from rio Tapajós basin, Brazil, Zootaxa 4344 (1), pp. 137-146: 138-143 138-143
Euryrhynchus amazoniensis     Pachelle, Paulo P. G. & Tavares, Marcos, 2018, The freshwater shrimp family Euryrhynchidae Holthuis, 1950 (Crustacea: Decapoda: Caridea) revisited, with a taxonomic revision of the genus Euryrhynchus Miers, 1878, Zootaxa 4380 (1): 17-37 17-37
Imparfinis munduruku   new species  Castro, Íthalo Da Silva & Wosiacki, Wolmar Benjamin, 2019, Anew species of Imparfinis Eigenmann & Norris, 1900 (Siluriformes: Heptapteridae) from the Tapajós basin, Brazil, Zootaxa 4701 (5), pp. 461-472: 462-469 462-469
Araneae   sp. nov.  Silva-Junior, Claudio J. & Bonaldo, Alexandre B., 2019, Four new species of Myrmecium Latreille, 1824 and complementary description of M. machetero Candiani & Bonaldo, 2017 (Araneae: Corinnidae: Castianeirinae), Zootaxa 4706 (2), pp. 391-400: 397-400 397-400
Monodelphis (Mygalodelphys) saci   new species  Pavan, Silvia E., Mendes-Oliveira, Ana C. & Voss, Robert S., 2017, A New Species of Monodelphis (Didelphimorphia: Didelphidae) from the Brazilian Amazon, American Museum Novitates 2017 (3872), pp. 1-20: 5-17 5-17
Actinopus caxiuana   sp. nov.  Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), Megataxa 2 (1), pp. 1-2: 108-111 108-111
Arachnida (awaiting allocation)   sp. nov.  Ott, Ricardo, Ubick, Darrell, Bonaldo, Alexandre B., Brescovit, Antonio D. & Harvey, Mark S., 2019, A revision of the new world goblin spider genus Cinetomorpha Simon, 1892 revalidated from Gamasomorpha Karsch, 1881 (Araneae, Oonopidae, Oonopinae), Zootaxa 4641 (1), pp. 1-152: 91-93 91-93
Characiformes   new species  Mathubara, Kleber & Toledo-Piza, Mônica, 2020, Taxonomic study of Moenkhausia cotinho Eigenmann, 1908 and Hemigrammus newboldi (Fernández-Yépez, 1949) with the description of two new species of Moenkhausia (Teleostei: Characiformes: Characidae), Zootaxa 4852 (1), pp. 1-40: 25-29 25-29
Rhinopetitia melanohumeralis   new species  Menezes, Naércio A. & Netto-Ferreira, Andre L., 2019, A systematic review of Rhinopetitia Géry (Teleostei, Characiformes, Characidae) with descriptions of four new species and redescription of R. myersi Géry, Zootaxa 4700 (1), pp. 59-86: 80-84 80-84