Plesiolebias canabravensis

description

Description. Morphometric data appear in Table 4. Largest male examined 19.5 mm SL, largest female examined 18.3 mm SL. Dorsal profile gently convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile weakly convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Body slender, compressed. Greatest body depth at level of pelvic-fin base. Jaws short, snout blunt. Tip of dorsal and anal fins rounded, without filaments. Caudal fin rounded. Pectoral fins elliptical, posterior margin reaching vertical between urogenital papilla and base of 2 nd anal-fin ray in males, between anus and base 3 rd anal-fin ray in females. Pelvic fins slightly pointed, without filaments; tip of each pelvic fin reaching base of 4 th anal-fin ray in males, reaching anal-fin origin in females. Pelvic-fin bases in close proximity medially. Dorsal-fin origin on vertical between base of 7 th and 8 th anal-fin rays, and between neural spines of 13 th and 14 th vertebrae. Anal-fin origin between pleural ribs of 9 th and 10 th vertebrae. Dorsal-fin rays 9 – 10; anal-fin rays 14 – 16; caudal-fin rays 22 – 24; pectoral-fin rays 11 – 12; pelvic-fin r

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

description

Plesiolebias aruana non P. aruana (Lazara); Costa, 1998 a: 325 (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 its congeners by the combined set of the following morphological features: no filamentous ray on each pelvic fin in males (vs. filamentous ray present); pelvic-fin rays 7 (vs. 8 – 9); eye bright green in males (vs. yellow); flank without oblique black bars in males (vs. black bars present); red stripe on anterior portion of flanks anteriorly reaching orbit in males (vs. red stripe not reaching orbit or absent); basal portion of dorsal fin with transverse rows of dark red and white spots in males (vs. red); no distinctive black spot on posterior portion of anal fin in males (vs. black spot present); dorsal-fin origin at vertical through base of 7 th or 8 th anal-fin rays (vs. in vertical between base of 5 th or 6 th anal-fin ray); oblique rows of dark brown dots restricted to the median portion of flanks, sometimes absent (vs. dark brown dots and elongated spots on whole flanks); anal-fin base with white elongate spots in males (vs. long curved bars, ventral tips anteriorly directed, often converging to a point on anterior margin of fin); 1 + 27 – 31 + 1 infra-orbital neuromasts (vs. 1 + 16 – 22 + 1).

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

distribution

Distribution and habitat. Plesiolebias canabravensis is known only from a seasonal lagoon near rio Canabrava, rio Tocantins basin (Fig. 13), in a savannah region.

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