Longtail knifefish

discussion

Remarks: Synonymy follows Albert (2003 b). Redescribed from specimens from the Paraguay River, Argentina, by López, Castello (1966 b).

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types

distribution

Distribution: Widely distributed across continent east of Andes, as well as Magdalena River basin (Albert, 2003 b); Uruguay River, Brazil (Bertaco, Cardoso, 2004).

Checklist of Gymnotiformes (Osteichthyes: Ostariophysi) and catalogue of primary types

description

Body elongated and compressed; greatest body depth contained 7.9 to 10.0 times in TL; head length 8.6 to 9.6, anal-fin base length 1.1 to 1.2, caudal filament length 2.6 to 4.9, preanal distance 6.8 to 7.6 and prepectoral distance 6.6 to 7.4 in LEA; snout length 2.6 to 3.0, horizontal orbital diameter 10.7 to 12.0 and least interorbital width 3.3 to 3.9 in HL. Mouth terminal. Pectoral fin with 15 or 17 and anal fin with 221 - 247 rays (Campos-da-paz, 1997). Lateral line complete, with 193 - 269 pored scales. Transversal series above lateral line with 20 - 22 scale rows. Ground color and fin rays greyish-brown, inter-radial membranes hyaline; dark-brown humeral spot, occasionally inconspicuous (Graça, Pavanelli, 2007). Maximum total length. 550.0 mm TL (Graça, Pavanelli, 2007).

Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated

biology_ecology

ECOLOGY. — Observed in both Alama mainstream and tributaries. This nocturnal species hides in the undercut banks and in submersed tree roots during the day. Captured using rotenone.

Fishes of the Mitaraka Mountains (French Guiana)