Pituna compacta

description

Description. Morphometric data appear in Table 1. Largest male examined 39.7 mm SL; largest female examined 35.8 mm SL. Dorsal profile slightly convex from snout to end of dorsal-fin base, about straight on caudal peduncle. Ventral profile gently convex from lower jaw to anal-fin origin, approximately straight to end of 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, posterior margin of each fin reaching vertical through anus in males, between pelvic-fin base and anus in females. Pelvic fins short, slightly pointed in males, elliptical in females; tip of each pelvic fin reaching between base of 2 nd and 4 th 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-f

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

diagnosis

Diagnosis. Distinguished from all 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 24.6 – 27.2 % SL in males and 24.1 – 26.3 % SL in females (vs. 21.3 – 24.6 % SL in males and 18.1 – 23.8 % SL in females), caudal peduncle depth 17.6 – 19.5 % SL in males and 15.6 – 17.9 % SL in females (vs. 15.5 – 17.1 % SL in males and 14.7 – 15.7 % SL in females), head depth 74.9 – 80.7 % SL in males and 71.8 – 77.1 % SL in females (vs. 69.4 – 75.4 % SL in males and 65.2 – 68.1 % SL in females), and 7 – 8 bars or transverse rows of spots on pectoral fins in males (vs. 4 – 5).

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

distribution

Distribution and habitat. Temporary pools of the middle rio Tocantins basin (Fig. 1), in typical savannah environments.

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 do Tocantins: rio Tocantins basin: CAS 40707 (lectotype, female, 25.5 mm SL); Dona Francisquinha, Porto Nacional; C. Ternetz, 16 Feb. 1924. UFRJ 2101 (11), temporary lagoon close to rio Dona Francisquinha, Porto Nacional; W. J. E. M. Costa, G. C. Brasil & C. Campinha, 16 Feb. 1994. UFRJ 2099 (29); UFRJ 2115 (2 [c & s]), temporary lagoon near rio Tocantins, Brejinho de Nazaré; W. J. E. M. Costa, G. C. Brasil & C. Campinha, 16 - 16 Feb. 1994. UFRJ 6391 (2); UFRJ 6392 (2 [c & s]), temporary swamp 2 km from rio Canabrava, rio Santa Tereza drainage, rio Tocantins basin, road TO- 373 12 km from the road BR- 153, 12 º 29 ’ 46.3 ” S 49 º 0 ’ 50.7 ” W, altitude 292 m; W. J. E. M. Costa, C. P. Bove, J. Paz & A. Oliveira, 16 Apr. 2006. UFRJ 3797, (2), 10 km of Salvação, Alvorada; D. T. B. Nielsen, A. Carletto & A. de Luca, 5 Apr. 1996. UFRJ 5118 (1), pool near Peixe; G. C. Brasil, 20 Apr. 2000. UFRJ 4090 (4), pool near left bank of rio Tocantins, Itaguatins; G. C. Brasil, 20 Apr. 1997.

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