Plesiolebias filamentosus

description

Description. Morphometric data given in Table 2. Largest male examined 19.9 mm SL, largest female examined 20.7 mm SL. Dorsal profile slightly convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile gently convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Body moderately slender, compressed. Greatest body depth at level of pelvic-fin base. Jaws short, snout blunt. Tip of both dorsal and anal fins rounded. Caudal fin rounded. Pectoral fins elliptical, posterior margin reaching vertical through base of 2 nd anal-fin ray in male, through anus in female. Pelvic fins pointed in males, terminating in long filament, with tip reaching between base of 10 th and 13 th anal-fin ray; tip of each pelvic fin reaching base of 2 nd anal-fin ray in females. Pelvic-fin bases medially united. Dorsal-fin origin on vertical through base of 7 th or 8 th anal-fin ray, and between neural spines of 10 th and 12 th vertebrae. Anal-fin origin between pleural ribs of 9 th and 11 th vertebrae. Dorsal-fin rays 11 – 13; anal-fin rays 15 – 16; caudal-fin rays 23 – 25; pectoral-fin rays 12; pelvic-fin rays 8. Scales large, cycloid. Bo

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

description

Plesiolebias xavantei non P. xavantei (Costa, Lacerda & Tanizaki); Costa, 1998 c: 330 (misidentification of specimens from Itaguatins, Tocantins, Brazil).

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 following morphological features in combination: filamentous ray on each pelvic fin in males (vs. filamentous ray absent); pelvic-fin rays 8 (vs. 7); eye yellow in males (vs. bright green); flanks with oblique black bars in males (vs. black bars absent); red stripe on anterior portion of flanks not anteriorly reaching orbit in males (vs. red stripe reaching orbit or absent); basal portion of dorsal fin red in males (vs. with transverse rows of dark red and white spots); a black spot on posterior portion of anal fin in males (vs. black spot absent); body depth 28.6 - 30.8 % SL in males, 26.4 - 29.3 % SL in females (vs. 23.2 – 25.7 % SL in males, 23.0 – 26.0 % SL in females); oblique rows of bright dots on flank in males (vs. sparse bright dots on flank); 4 white bars on basal portion of anal fin in males (vs. 3); a black bar on preopercle (vs. black bar absent); dorsal fin-origin in vertical between base of 5 th and 6 th anal-fin rays (vs. between base of 3 rd and 5 th or between base of 7 th and 8 th anal-fin rays); 15 – 16 anal-fin rays (vs. 17 – 18); red pigmentation restricted to basal third of dorsal fin in males (vs. exten

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 in the southeastern portion of the Amazonian forest, middle rio Tocantins floodplains, between Itaguatins and Sampaio, Estado do Tocantins, Brazil (Fig. 13).

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