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Plecostomus derbyi Haseman. Type.
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Hemiodontichthys acipenserinus (KJner).
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Hypostoma squalinum.
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Acanthicus histrix. Fort St. Joaquim in the Distance.
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Otocinclus vittalus Regan.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Claudio Oliveira
Zookeys
Figure 1.Pareiorhina hyptiorhachis, sp. n., MZUSP 111956, 33.6 mm SL, holotype from Ribeirão Fernandes, Rio Paraíba do Sul basin, municipality of Santa Barbara do Tugúrio.
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Fábio F. Roxo, Cláudio H. Zawadzki, Waldo P. Troy
Zookeys
Figure 1.Hisonotus oliveirai, holotype, MZUSP 115061, female, 26.4 mm SL, from ribeirão Cambira, affluent rio Ivaí, upper rio Paraná basin, boundary between municipalities of Cambira and Apucarana, Paraná State, Brazil.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Ricardo Britzke, Claudio Oliveira
Zookeys
Figure 1.Pseudancistrus zawadzkii, MZUSP 115056, holotype, male, 116.4 mm SL; Pará State, Tapajós river basin, Brazil.
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Fábio F. Roxo, Gabriel S. C. Silva, Cláudio H. Zawadzki, Claudio Oliveira
Zookeys
Figure 1.Neoplecostomus doceensis, MZUSP 115486, male, 101.1 mm SL, holotype from the affluent of rio Gualaxo do Norte, rio Doce basin, municipality of Ouro Preto, Minas Gerais State, Brazil.
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Plecostomus derbyi Haseman. Dorsal view of type.
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New Plecostomus, One of the Mailed Catfishes.
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Loricaria lanceolata, Upper Amazon.
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Acestridium discus Haseman. Type.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Claudio Oliveira
Zookeys
Figure 2.a Pareiorhina hyptiorhachis, sp. n.,paratype, LBP 12248, 29.2 mm SL, showing the conspicuous postdorsal ridge b Pareiorhina carrancas, LBP 8380, 38.2 mm SL, showing the poorly-developed postdorsal ridge c Pareiorhina rudolphi, LBP 8044, 40.5 mm SL, showing the absence of a postdorsal ridge.
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Fábio F. Roxo, Cláudio H. Zawadzki, Waldo P. Troy
Zookeys
Figure 2.Variation in hypertrophied series of anterolateral (A, C, E) and anterodorsal (B, D, F) odontodes across three species. A Hisonotus oliveirai, paratype, NUP 9839, female, 25.8 mm SL, small odontodes B Hisonotus oliveirai, paratype, NUP 9839, female, 25.8 mm SL, small odontodes C Hisonotus paresi, paratype, NUP 10928, male, 24.2 mm SL, small odontodes D Hisonotus paresi, paratype, NUP 10928, male, 24.2 mm SL, small odontodes E Hisonotus insperatus, LBP 1316, 24.7 mm SL, large and conspicuous odontodes F Hisonotus insperatus, LBP 1316, 24.7 mm SL, large and conspicuous odontodes.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Ricardo Britzke, Claudio Oliveira
Zookeys
Figure 3.Pseudancistrus zawadzkii, live specimen, LBP 15045, paratype, female, 128.7 mm SL, Tapajós river, Pará State, Brazil.
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Fábio F. Roxo, Gabriel S. C. Silva, Cláudio H. Zawadzki, Claudio Oliveira
Zookeys
Figure 2.a Neoplecostomus doceensis, MZUSP 115486, 101.1 mm SL, male, holotype, arrow showing the developed papillae between dentaries b Neoplecostomus botucatu, MZUSP 110364, 98.6 mm SL, male, paratype, lacking the papillae between dentaries c Neoplecostomus doceensis, MZUSP 115486, 101.1 mm SL (male), holotype, arrow showing the developed papillae series anterior to premaxillary teeth d Neoplecostomus selenae, MZUSP 51889, 101.7 mm SL, male, paratype, lacking the papillae series anterior to premaxillary teeth.
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Plecostomus derbyi Haseman. Ventral view of type.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Claudio Oliveira
Zookeys
Figure 3.a Pareiorhina carrancas, LBP 8380, 36.5 mm SL, showing the elliptical anterior profile of the head elliptical in dorsal view b Pareiorhina rudolphi, LBP 8044, 42.0 mm SL, showing the elliptical anterior profile of the head in dorsal view c Pareiorhina hyptiorhachis, new species, holotype, MZUSP 111956, 33.6 mm SL, showing the rounded anterior profile of the head in dorsal view.
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Fábio F. Roxo, Cláudio H. Zawadzki, Waldo P. Troy
Zookeys
Figure 3.Hisonotus oliveirai, paratype, NUP 7065, sex unknown, 24.5 mm SL A Ventral view of abdominal region showing intraspecific variation in abdominal dermal plate patterns B lateral trunk plates; cranial bones and dermal plates of the head in dorsal C and lateral D view. Scale bars: 1 mm.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Ricardo Britzke, Claudio Oliveira
Zookeys
Figure 4.Map showing the type locality (red square) of Pseudancistrus zawadzkii at rio Tapajós, 04°33'09.7"S, 56°17'59.6"W, and paratype locality (black circle) at rio Tracuá, Tapajós river basin, 04°28'11.2"S, 56°17'01.1"W.
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Fábio F. Roxo, Gabriel S. C. Silva, Cláudio H. Zawadzki, Claudio Oliveira
Zookeys
Figure 3.Map showing the type locality (pink diamond), 20°14'20"S, 43°28'40"W, and paratypes (red circles) of Neoplecostomus doceensis at the rio Doce basin (green highlighted drainages). See Distribution and Paratypes sections for details about each paratype localities.
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Gabriel de Souza da Costa e Silva, Fábio Fernandes Roxo, Claudio Oliveira
Zookeys
Figure 4.Additional coloration pattern of coloration of Pareiorhina hyptiorhachis, sp. n., LBP 12257, female, 27.2 mm SL.
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Fábio F. Roxo, Cláudio H. Zawadzki, Waldo P. Troy
Zookeys
Figure 4.Ventral view of abdominal region of three species of Hisonotus, arrows indicate anal membrane in Hisonotus oliveirai (A, D) and Hisonotus paresi (B, E) contrasting with the lack of the anal membrane in Hisonotus chromodontus (C, F). A Hisonotus oliveirai, MZUSP 115061, holotype, female, 26.4 mm SL B Hisonotus paresi, MZUSP 115062, holotype, female, 26.2 mm SL C Hisonotus chromodontus, LBP 7964, female, 28.1 mm SL D Hisonotus oliveirai, NUP 3578, male, 27.1 mm SL E Hisonotus paresi, NUP 10928, male, 24.2 mm SL F Hisonotus chromodontus, LBP 12278, male, 26.7 mm SL.
