Glass Knifefish

distribution

Distribution: La Plata basin and lower Río Paraná basin, Argentina (Peixoto et al., 2015).

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

description

- Sternopygidae The spermatozoa of Egenmannia trilineata are comprised of a spherical head (Fig. 3 A) containing an ovoid nucleus (Fig. 1 B), a distinct midpiece (Fig. 3 B-E), and single flagellum (Fig. 3 A-B). Nuclear length measured approximately 1.3 µm and width 1.3 µm. The nucleus contains masses of electron-dense flocculent chromatin in a lighter matrix (Fig. 3 B-E). Nuclear rotation takes place during spermiogenesis. The proximal centriole is anterior and perpendicular to the distal centriole and both centrioles are contained within a nuclear fossa (Fig. 3 B). It was not possible to definitively identify a cytoplasmic collar in the region immediately posterior to the nucleus; however, more posteriorly a collar is lacking. The midpiece contains several elongate mitochondria (Fig. 3 B-D-E) and relatively few vesicles (Fig. 3 D-E). The flagellum has the usual 9 + 2 microtubular arrangement with no intratubular differentiation (Fig. 3 C-D). Along most of its length the flagellum has a pair of lateral projections or fins (Fig. 3 C).

Sperm ultrastructure in three different families of weakly electric fishes (Teleostei: Gymnotiformes)

Eigenmannia trilineata Lopez & Castello 1966

Key to species of the “ Eigenmannia trilineata ” species group • 1a Number of premaxillary teeth 27–40 .............................................................. 2 • 1b Number of premaxillary teeth 8–26 ................................................................ 7 • 2a Number of premaxillary teeth 27 ....................................................................3 • 2b Number of premaxillary teeth 32–40 .............................................................. 4 • 3a Suborbital depth 18 3–14 8% HL ..................................... Eigenmannia besouro • 3b Suborbital depth 30–37 7% HL ................................ Eigenmannia camposi n sp • 4a Number of premaxillary teeth 32 ....................................................................5 • 4b Number of premaxillary teeth 35–40 ................................. Eigenmannia wawai • 5a Number of teeth in dentary 23 ....................................... Eigenmannia trilineata • 5b Number of teeth in dentary 35–60 .................................................................. 6 • 6a Number of teeth in dentary 35–39 .............................. Eigenmannia magoi n sp • 6b Number of tee

Three new species of the Eigenmannia trilineata species group (Gymnotiformes: Sternopygidae) from northwestern South America

description

Body elongated and compressed; greatest body depth contained 4.8 to 5.6 times in TL; head length 7.4 to 9.0, anal-fin base length 1.1 to 1.2, caudal filament length 2.8 to 4.0, preanal distance 5.9 to 7.8 and prepectoral distance 7.0 to 9.1 in LEA; snout length 2.5 to 3.5, horizontal orbital diameter 4.0 to 5.2 and least interorbital width 2.0 to 2.6 in HL. Mouth terminal. Pectoral fin with 16 - 18 and anal fin with 197 - 230 rays. Lateral line complete, with 110 - 122 pored scales. Transversal series above lateral line with 15 - 16 scale rows (Campos-da-paz, 1997). Ground color pale brown; four dark-brown longitudinal stripes on flank (one superior medial, one on lateral line, one inferior medial and one at anal-fin base) (Graça, Pavanelli, 2007). Maximum total length. 265.0 mm TL (Graça, Pavanelli, 2007).

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