Ferrer, Juliano; Donin, Laura M.

Juliano Ferrer

Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil. (JF) julianoferrer@bol.com.br (corresponding author), (LMD) lauradonin@hotmail.com

Laura M. Donin

Programa de Pós-Graduação em Biologia Animal, Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Agronomia, 91501-970 Porto Alegre, RS, Brazil. (JF) julianoferrer@bol.com.br (corresponding author), (LMD) lauradonin@hotmail.com

Figuras (6)
Tabelas (1)

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Fig. 1
Ituglanisinusitatus, new species, holotype, UFRGS 21829, 62.2 mm SL; arroio São João, Alegrete, rio Ibicuí basin, Rio Grande do Sul State, Brazil. Cut over the dorsal margin of the caudal peduncle is absent in remaining type specimens.

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Fig. 2
Ituglanisinusitatus, new species, paratype, UFRGS 20201, 70.2 mm SL, c&s. Dorsal view of gill arches: basibranchials 2 to 4 (BB2-4), ceratobranchials 1 to 5 (CB1-5), epibranchials 1 to 4 (EB1-4), hypobranchials 1 to 3 (HB1-3), pharyngobranchial 3 (PB3), tooth plate attached to pharyngobranchial 4 (TP). Arrows indicate the process at distal portion of anterior margin of hypobranchial 1.

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Fig. 3
Ituglanisinusitatus, new species, paratype, UFRGS 20201, 70.2 mm SL, c&s. Dorsal view of mesethmoid (ME), premaxilla (PM), maxilla (MX), tendon-bone supraorbital (SO), frontal (FR), autopalatine (AP), and antorbital (AN). Arrows indicate the enlargement at middle portion of mesethmoid. Gray area represents cartilage. Scale bar = 2 mm.

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Fig. 4
Ituglanisinusitatus, new species, paratype, UFRGS 20201, 70.2 mm SL, c&s. Lateral view of right suspensorium: metapterygoid (MP), quadrate (QU), preopercle (PO), and hyomandibula (HY). Gray area represents cartilage. Scale bar = 2 mm.

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Fig 5
Geographic distribution of Ituglanis inusitatus, new species (white symbols), I. australis (yellow symbols) and Ituglanis sp. 3 (red symbols). Some symbols represent more than one collection locality. Stars represent type localities. Numbers 1 and 2 indicate rio Uruguay and laguna dos Patos, respectively.

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Fig 6
Type locality of Ituglanis inusitatus, new species: arroio São João, Alegrete, rio Ibicuí basin, Rio Grande do Sul State, Brazil.

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Tab. 1
Morphometric data of Ituglanis inusitatus, new species. Range refers to eight specimens in total including holotype (UFRGS 21829) and seven paratypes (MCN 19975: n = 1; UFRGS 19311: n = 1; UFRGS 20201: n = 4; UFRGS 21242: n = 1); SD: standard deviation.

	Holotype	Range	Mean	SD
Standard length (mm)	62.2	32.8-70.2	57.9	-
Percent of standard length
Head length	17.2	15.3-19.8	17.0	1.3
Predorsal length	74.2	69.6-74.2	72.9	1.5
Prepelvic length	66.1	64.5-68.3	65.7	1.2
Preanal length	77.1	73.8-77.1	75.7	1.0
Scapular girdle width	13.8	12.4-14.9	13.5	0.8
Trunk length	50.9	50.1-51.9	50.9	0.7
Pectoral-fin length	10.9	9.3-12.0	10.5	0.9
Pelvic-fin length	8.6	8.0-9.5	8.6	0.5
Distance between pelvic-fin base and anus	6.0	5.4-6.9	6.4	0.6
Caudal peduncle length	15.6	15.2-17.2	15.9	0.6
Caudal peduncle depth	11.4	9.4-11.6	10.7	1.0
Body depth	13.1	11.4-15.1	13.0	1.2
Length of dorsal-fin base	9.6	9.6-11.1	10.3	0.4
Length of anal-fin base	7.8	7.4-8.6	8.0	0.4
Percent of head length
Head width	86.3	82.1-95.0	87.9	3.8
Nasal barbel length	65.9	60.9-74.9	69.7	5.8
Maxillary barbel length	69.1	66.8-82.5	75.2	6.2
Rictal barbel length	63.4	58.4-70.9	63.7	3.7
Snout length	36.0	34.6-36.8	35.8	0.7
Interorbital	23.1	20.3-26.7	23.6	2.1
Mouth width	42.0	41.8-46.6	43.7	1.8
Eye diameter	13.2	11.4-13.7	13.1	0.7
Supra-orbital pore distance	14.4	11.0-15.1	12.7	1.6
Interopercular length	28.7	28.0-30.4	29.1	0.9

Brasil

Brasil

A new species of Ituglanis (Siluriformes: Trichomycteridae) from the rio Uruguai basin, southern Brazil

RESUMO