Striped-eye Pearlfish

description

Description Morphometric data appear in Table 7. Males larger than females, largest male examined 50.0 mm SL, largest female 30.3 mm SL. Dorsal profile convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle; dorsal profile on head and anterior portion of trunk often strongly convex in females; often adipose ridge on posterior portion of frontal region in males. Ventral profile gently convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Greatest body depth at level of pelvic-fin base. Body deep and compressed. Snout blunt and jaws short. Tip of both dorsal and anal fins rounded. Dorsal and anal fins shortened in males. Fin membranes between rays on distal margin of dorsal and anal fins, and posterior margin of pectoral fins distinctively concave, ray tips forming fringe-like margin. Anteromedian rays of anal fin of females lengthened, anal fin shape nearly triangular; distal portion of anal fin thickened in females. Caudal fin rounded. Pectoral fins elliptical, posterior margin on vertical between base of 3 rd and 5 th anal-fin rays in males, on vertical through urogenital papilla in females. Tip of both pelvic fins reach

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.

diagnosis

Diagnosis Differs from remaining species of the A. bellottii group in possessing short dorsal and anal fins in males, anal fin with short filaments extending along distal border in males, two anterior rostral neuromasts, and numerous (5 - 16) black spots on anterocentral portion of flanks in females. Also distinguished from all other species of the A. bellottii group by the following combination of features: no contact organ on anal fin in males, urogenital papilla attached to anal fin in males, dorsal-fin origin slightly anterior or on vertical through anal-fin origin in males, flank light bluish gray with narrow dark gray bars in males, anal-fin rays 25 - 28 in males, 21 - 25 in females, longitudinal series scales 26 - 29, frontal squamation H or G-patterned, and vertebrae 27 - 31.

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.

distribution

Distribution Rio Tacuarembo drainage, rio Uruguay basin, northern Uruguay (Fig. 11).

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.

materials_examined

Material examined Uruguay: Tacuarembo: CTL 158 b, 1; temporary pool at floodplains of arroyo Tres Cruces, rio Tacuarembo drainage, rio Uruguay basin, Ruta 5, km 399.5; P. Laurino et al., 17 Aug. 2002. UFRJ 6161, 2; UFRJ 6162, 4 (c & s); CTL 1035 b, 10; same locality; P. Laurino et al., 22 Aug. 2004. UFRJ 6223, 3; UFRJ 6224, 5 (c & s); CTL 1213 b, 150; Ansina, 31 ° 53.08 ’ S 55 ° 29.52 ’ W; P. Laurino et al., 25 Aug. 2004. Artigas: UFRJ 6225, 11; Tranqueras; C. Gorsse-Schware & T. Litz, 21 Oct. 1999. UFRJ 6221, 10; UFRJ 6222, 8 (c & s); CTL 1040, 150; CTL 1734, 15; Tranqueras, Ruta 30, temporary swamp near rio Tacuarembo, 31 ° 10.60 ’ S 55 ° 45.88 ’ W; P. Laurino et al., 23 Aug. 2004. Rivera: UFRJ 6219, 8; UFRJ 6220, 8 (c & s); CTL 1192, 110; FYMNSA, 31 ° 6.45 ’ S 55 ° 44.79 ’ W; P. Laurino et al., 24 Aug. 2004. CTL 1196, 31; 31 ° 5.71 ’ S 55 ° 41.21 ’ W; P. Laurino et al., 25 Aug. 2004 [[ Paso Ataques ]]. CTL 1198, 78; temporary swamp near rio Tacuarembo, 31 ° 5.22 ’ S 55 ° 41.87 ’ W; P. Laurino et al., 25 Aug. 2004.

The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision.