Pituna poranga

description

Description. Morphometric data appear in Table 1. Largest male examined 32.6 mm SL; largest female examined 28.0 mm SL. Dorsal profile slightly convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile weakly convex from lower jaw to anal-fin origin, nearly straight along caudal peduncle. Body slender, subcylindrical, slightly deeper than wide, greatest body depth at level of pelvic-fin base. Jaws short, snout blunt. Dorsal and anal fins pointed in both sexes, longer and often with filamentous tip reaching to vertical through base of caudal fin in males. Caudal fin rounded. Pectoral fins rounded, its posterior margin reaching vertical between pelvic-fin base and anus in males, through pelvic-fin base in females. Pelvic fin short, slightly pointed in males, elliptical in females; tip of each pelvic fin reaching between base of 1 st and 3 rd analfin rays in males, and base of 1 st anal-fin ray in females. Pelvic-fin bases medially in close proximity. Dorsalfin origin at vertical through base of 10 th or 11 th anal-fin rays, between neural spines of vertebrae 18 and 20. Anal-fin origin between pleural ribs of vertebrae 12 and 14. Dorsal-fi

Taxonomy of the plesiolebiasine killifish genera Pituna, Plesiolebias and Maratecoara (Teleostei: Cyprinodontiformes: Rivulidae), with descriptions of nine new species

diagnosis

Diagnosis. Differs from all other congeners by the following combination of characters: 25 – 29 scales in longitudinal series (vs. 23 – 24), pectoral fin with vertical rows of small dark gray spots or dark gray bars in males (vs. pectoral fin without dark marks), frontal squamation F-patterned (vs. D-patterned), anterior section of supraorbital series of neuromasts continuous (vs. interrupted), dark marks on flank mainly longitudinally arranged in females (vs. mainly obliquely or irregularly arranged), body depth 21.3 – 24.6 % SL in males and 18.1 – 23.8 % SL in females (vs. body depth 24.6 – 27.2 % SL in males and 24.1 – 26.3 % SL in females), caudal peduncle depth 15.5 – 17.1 % SL in males and 14.7 – 15.7 % SL in females (vs. caudal peduncle depth 17.6 – 19.5 % SL in males and 15.6 – 17.9 % SL in females), head depth 69.4 – 75.4 % SL in males and 65.2 – 68.1 % SL in females (vs. head depth 74.9 – 80.7 % SL in males and 71.8 – 77.1 % SL in females) and 4 – 5 bars or transverse rows of spots on pectoral fins in males (vs. 7 – 8).

Taxonomy of the plesiolebiasine killifish genera Pituna, Plesiolebias and Maratecoara (Teleostei: Cyprinodontiformes: Rivulidae), with descriptions of nine new species

distribution

Distribution and habitat. Temporary swamps of middle rio Araguaia basin, Goiás and Tocantins, Brazil (Fig. 1), usually in open areas of savanna vegetation.

Taxonomy of the plesiolebiasine killifish genera Pituna, Plesiolebias and Maratecoara (Teleostei: Cyprinodontiformes: Rivulidae), with descriptions of nine new species

materials_examined

Material examined. Brazil: Estado de Goiás: rio Araguaia basin: MZUSP 38511 (male holotype, 28.1 mm SL); MZUSP 38510 (1 paratype [c & s]); MZUSP 38509 (1 paratype [c & s]); MNRJ 11388 (1 paratype), Aruanã; S. Valério, 1986. UFRJ 6394 (1), swamp close to road GO- 173, about 25 km N from Aruanã, 14 º 49 ’ 10.0 ” S 50 º 58 ’ 36.4 ” W, altitude 255 m; W. J. E. M. Costa, C. P. Bove, J. Paz & A. Oliveira, 13 Apr. 2006. UFRJ 6395 (1), swamp close to road GO- 173, about 5 km S from Aruanã, 14 º 59 ’ 34.7 ” S 51 º 05 ’ 31.2 ” W, altitude 265 m; W. J. E. M. Costa, C. P. Bove & J. Paz, 12 Apr. 2006. UFRJ 6396 (3), swamp close to road GO- 173, Aruanã, 14 º 44 ’ 38.8 ” S 50 º 56 ’ 34.8 ” W, altitude 255 m; W. J. E. M. Costa, C. P. Bove, J. Paz & A. Oliveira, 13 Apr. 2006. UFRJ 3540 (13), temporary pool 4 km E of rio Araguaia, road to Peixe; W. J. E. M. Costa, G. C. Brasil. M. I. Landim & C. Moreira, 16 Feb. 1996. Estado do Tocantins: UFRJ 3563 (27); UFRJ 3564 (4 [c & s]), temporary lagoon near Barreira do Piqui; W. J. E. M. Costa, G. C. Brasil. M. I. Landim & C. Moreira, 15 Feb. 1996. MZUSP 45222 (28), rio Água Fria, Praia Alta 2 farm, road Araguaçu-Barreira do Piqui, 27 km N from Araguaçu; F.

Taxonomy of the plesiolebiasine killifish genera Pituna, Plesiolebias and Maratecoara (Teleostei: Cyprinodontiformes: Rivulidae), with descriptions of nine new species