Longfin Killie

biology_ecology

Habitat: Temporary lagoons in open sunny areas, sometimes at borders of forests.

The Neotropical annual killifish genus Pterolebias Garman (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology, and taxonomic revision.

description

Description. Morphometric data appear in Table 2. Males larger than females, largest male 50.5 mm SL. Dorsal profile slightly convex from snout to end of dorsal-fin base, gently concave on caudal peduncle. Ventral profile slightly convex from lower jaw to end of anal-fin base, weakly concave along caudal peduncle. Body somewhat deep, subcylindrical anteriorly, deeper than wide, to compressed posteriorly. Greatest body depth at level of pelvic-fin base. Jaws short, snout slightly pointed. Tip of dorsal fin pointed with short filamentous rays in males, rounded to slightly pointed in females. Anal fin approximately rectangular in males, longer than deep, and long, reaching vertical through middle of caudal fin; tip of anal fin pointed, with filamentous rays. Anal fin rounded, short, and without filamentous rays in females. Caudal fin rounded to subtruncate, long in males, with posterior margin terminating in fringe-like posterior extensions; caudal fin short, elliptical, and without posterior extensions in females. Pectoral fin elliptical, posterior margin reaching vertical between pelvic-fin base and anus. Pelvic fin pointed, terminating in long tip, reaching between middle of anal-f

The Neotropical annual killifish genus Pterolebias Garman (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology, and taxonomic revision.

diagnosis

Diagnosis: Distinguished from P. phasianus by having a deeper body (body depth 25.0 - 28.8 % SL vs. 19.5 - 23.0 % SL in males, 25.3 - 27.0 % SL vs. 19.4 - 23.1 % SL in females; caudal peduncle depth 15.8 - 17.8 % SL vs. 11.8 - 14.8 % SL in males, 14.9 - 16.8 % SL vs. 11.9 - 13.7 % SL in females), three to seven rows of scales on anal-fin base in males (vs. a single row), one or two rows of scales on dorsal-fin base in males (vs. no scales), pelvic-fin bases medially united (vs. separated), more neuromasts in the infraorbital series (2 - 3 + 19 - 21 + 1, vs. 1 - 2 + 16 - 17 + 1), preopercular series (2 + 11 - 14, vs. 2 + 9 - 10), and mandibular series (6 - 7 + 2 - 4, vs. 5 + 2), flank light brown with oblique rows of green dots (vs. blue with dark brown stripes), absence of a subdistal zigzag bluish white line on anal fin in male (vs. presence). Pterolebias longipinnis usually has more dorsal and anal fin rays than P. phasianus (9 - 11 and 17 - 22, respectively, vs. 7 - 9 and 15 - 17).

The Neotropical annual killifish genus Pterolebias Garman (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology, and taxonomic revision.

distribution

Distribution: Lower Amazonian basin, Madeira River drainage, and Parana-Paraguay River system, in Brazil, Bolivia, Paraguay and Argentina (Fig. 8).

The Neotropical annual killifish genus Pterolebias Garman (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology, and taxonomic revision.