Tencatt, Luiz Fernando Caserta; Ohara, Willian Massaharu

Luiz Fernando Caserta Tencatt

Universidade Estadual de Maringá, Programa de Pós-Graduação em Ecologia de Ambientes Aquáticos Continentais, Av. Colombo, 5790, 87020-900 Maringá, PR, Brazil. luiztencatt@hotmail.com (corresponding author)

Willian Massaharu Ohara

Museu de Zoologia da Universidade de São Paulo, Caixa Postal 42494, 04299-970 São Paulo, SP, Brazil. willianmohara@gmail.com

Figuras (6)
Tabelas (1)

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Fig. 1
Corydoras brittoi , holotype, MNRJ 43316, 38.1 mm SL, Brazil, Mato Grosso State, Colniza Municipality, Guariba District, tributary to the rio Guariba, rio Aripuanã drainage, rio Madeira basin, 09°06'47.4"S 60°25'14.1"W. Dorsal (top), lateral (middle) and ventral (bottom) views. Photo by Celso Ikedo.

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Fig. 2
Lateral view of the head of c&s specimens of Corydoras brittoi , NUP 17313, 34.1 mm SL, showing the poorly-developed ventral expansion of the infraorbital 1 (a) and infraorbital 2 in contact with compound pterotic (b), and of Corydoras pavanelliae , NUP 17315, 25.4 mm SL, showing thepoorly-developed ventral expansion of the infraorbital 1 (c) and infraorbital 2 not in contact with compound pterotic (d). The dotted lines in (b) and (d) represent the suture between sphenotic and compound pterotic bones. Abbreviations: io1: infraorbital 1, io2: infraorbital 2, sph: sphenotic, cpt: compound pterotic. Scale bar = 1.0 mm.

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Fig. 3
Dorsal- and pectoral-fin spines of (a, c) Corydoras brittoi ,NUP 17313, 34.1 mm SL, showing serrations directed towards the origins of the spines on posterior margins of the (a) dorsal-fin spine (8.6 mm long) and of the (c) right pectoral-fin spine (8.9 mm long), and of (b, d) Corydoras pavanelliae , NUP 17315, 26.8 mm SL,showing serrations directed towards the tips of the spines on posterior margins of the (b) dorsal-fin spine (7.9 mm long) and of the (d) right spine (7.6 mm long).

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Fig. 4
Specimen of Corydoras brittoi photographed in life, showing the iridescent greenish yellow coloration all over the body.

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Fig. 5
Map showing the type-locality (red circle) of Corydoras brittoi and Corydoras pavanelliae , a tributary to the rio Guariba, Mato Grosso. The blue triangle represents the Igarapé Pica-Pau, also a tributary to the rio Guariba, and the yellow triangle represents the rio Aripuanã, both representing additional records of C. brittoi .

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Fig. 6
Corydoras pavanelliae , holotype, MNRJ 43317, 45.1 mm SL, Brazil, Mato Grosso State, Colniza Municipality, Guariba District, tributary to the rio Guariba, rio Aripuanã drainage, rio Madeira basin, 09°06'47.4"S 60°25'14.1"W. Dorsal (top), lateral (middle) and ventral (bottom) views. Photo by Celso Ikedo.

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Table 1
Morphometric data for Corydoras brittoi and Corydoras pavanelliae . N= number of measured specimens and SD = standard deviation.

	Corydoras brittoi				Corydoras pavanelliae
	N	Holotype	Low-High	Mean±SD	N	Holotype	Low-High	Mean±SD
Standard length (mm)	20	38.1	31.4-39.0	36.1.5±1.8	20	45.1	23.3-45.1	26.6±4.8
Percents of standard length
Depth of body	20	38.6	34.7-40.5	38.7±1.2	20	43.2	35.8-43.2	38.7±1.6
Predorsal distance	20	51.2	49.5-53.3	51.1±0.8	20	54.5	48.6-54.5	52.2±1.6
Prepelvic distance	20	48.8	47.8-51.1	49.1±0.7	20	50.1	45.8-51.4	48.3±1.5
Preanal distance	20	83.2	80.3-85.1	82.1±1.2	20	85.8	78.1-85.8	81.3±1.8
Preadipose distance	20	84.3	83.8-86.5	84.8±0.9	20	88.2	83.5-88.7	85.6±1.5
Length of dorsal spine	19	23.6	23.6-27.2	25.3±1.2	19	30.8	26.7-32.4	30.3±1.4
Length of pectoral spine	20	24.9	24.2-27.2	25.9±0.9	20	31.7	28.7-33.8	31.1±1.3
Length of adipose-fin spine	19	8.4	8.0-10.2	9.0±0.6	20	8.6	7.6-9.8	8.7±0.7
Depth of caudal peduncle	20	14.7	13.7-15.7	14.9±0.5	20	15.7	15.0-16.9	15.8±0.6
Length of dorsal-fin base	20	19.4	18.6-21.6	20.2±0.8	20	19.3	16.7-19.5	18.1±0.8
Dorsal to adipose distance	20	16.8	14.9-19.1	16.7±1.3	20	18.2	18.0-20.5	19.3±0.8
Maximum cleithral width	20	23.1	22.9-25.2	24.0±0.6	20	29.3	26.5-29.3	27.7±0.8
Head length	20	44.4	42.6-49.0	45.0±1.4	20	47.7	44.2-48.6	46.6±1.3
Length of maxillary barbel	20	17.3	12.1-19.2	16.3±1.5	20	15.1	9.7-15.1	12.3±1.7
Percents of head length
Head depth	20	79.2	71.9-84.3	81.0±3.1	20	84.7	73.3-84.7	79.1±2.9
Least interorbital distance	20	29.2	28.1-32.3	31.0±1.2	20	33.5	29.3-34.0	31.4±1.3
Horizontal orbit diameter	20	22.8	20.9-24.3	22.8±0.8	20	21.4	21.4-27.4	24.9±1.3
Snout length	20	33.2	35.9-43.4	40.7±1.8	20	37.7	32.7-37.8	35.3±1.4
Least internarial distance	20	14.9	10.0-14.5	12.6±1.1	20	16.3	11.8-16.3	14.2±1.1

Brasil

Brasil

Two new species of Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio Madeira basin, Brazil

Resumo