Pituna obliquoseriata

description

Description. Morphometric data appear in Table 1. Largest male examined 37.5 mm SL; largest female examined 29.2 mm SL. Dorsal profile weakly convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile gently 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 each often with filamentous tip reaching to vertical through middle of caudal fin in males. Caudal fin rounded. Pectoral fins rounded, their posterior margin reaching vertical between pelvic-fin base and anus in males, through pelvic-fin base in females. Pelvic fins short, slightly pointed in males, elliptical in females; tip of each pelvic fin reaching between base of 1 st and 3 rd anal-fin rays in males, and base of 1 st anal-fin ray in females. Pelvic-fin bases in close proximity medially. Dorsal-fin origin at vertical through base of 9 th or 10 th anal-fin rays, between neural spines of vertebrae 18 and 20. Anal-fin origin between pleural ribs of vertebrae 12 and 14.

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

description

Pituna compacta non P. compacta (Myers); Costa, 1998 b: 142 (misidentification).

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 in having more caudal-fin rays (28 – 31 vs. 24 – 28). It is also distinguished from all other species of the genus by the following combination of characters: 25 – 29 scales in longitudinal series (vs. 23 – 24), pectoral fins 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 flanks mainly obliquely arranged in females (vs. mainly longitudinally or irregularly arranged), 1 + 1 + 13 – 17 + 1 infraorbital neuromasts (vs. 1 + 1 + 17 – 21 + 1), and oblique rows of dark brown dots never forming bars on flank in females (vs. forming oblique bars).

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

distribution

Distribution and habitat. Known only from the type locality, a temporary swamp near rio das Mortes, rio Araguaia basin, central Brazil (Fig. 1), in a savannah area.

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