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57 results for “Apteronotidae”
FIGURE 2 in Sternarchorhynchus curumim (Gymnotiformes: Apteronotidae), a new species of tube-snouted ghost electric knifefish from the low- land Amazon basin, Brazil
FIGURE 2. Electric Organ Discharge (EOD) waveform (left) and Fourier Power Spectrum (right) of Sternarchorhynchus curumim n. sp., MCP 38304 (WGRC 50.231099, female). EOD plotted with headpositivity upwards, voltage on the vertical axis (dashed line = 0 volts) and time on the horizontal axis (scale bar = 1 msec). Power spectrum computed by 65536 point FastFourier Transform from a 3 sec digital recording with a sample rate of 96 kHz. The Peak Power Frequency (PPF), which is equivalent to the fundamental frequency, is scaled to 0 dB.
FIGURE 1 in Sternarchorhynchus curumim (Gymnotiformes: Apteronotidae), a new species of tube-snouted ghost electric knifefish from the low- land Amazon basin, Brazil
FIGURE 1. Photographs of preserved specimens of Sternarchorhynchus curumim n. sp.: A: holotype, MCP 38304, mature female showing lateral and dorsal views, and close up of head. B: head of paratype, MCP 38305, mature male. Scale bars = 10 mm. Note the slightly wider snout in the male.
FIGURE 2. Apteronotus mariae, CAS 62345, 274.5 in Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)
FIGURE 2. Apteronotus mariae, CAS 62345, 274.5 mm TL, lower jaw, lateral view, left side.
FIGURE 1 in Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)
FIGURE 1. Lateral and dorsal views of paratype of Apteronotus mariae, CAS 62345.
FIGURE 4 in Redescription of Apteronotus mariae (Eigenmann & Fisher, 1914) and the taxonomic status of Apteronotus jurubidae (Fowler, 1944) (Gymnotiformes: Apteronotidae)
FIGURE 4. Lateral view of anterior portion of Apteronotus jurubidae, ANSP 71435.
FIGURE 13 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 13 | Phylogenetic position of Tenebrosternarchus () within the Navajini modified from Bernt et al., 2019. Topology is a summary of maximum likelihood and Bayesian analyses of seven concatenated loci from Bernt et al. (2019). All nodes shown in this topology have bootstrap support values at or above 85% and posterior probabilities above 0.90.
FIGURE 11 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 11 | Heads of male Tenebrosternarchus preto A. ANSP 198373 (302 mm TL) from the río Apure at San Fernando de Apure, Venezuela B. MUSM 59463 (291 mm) and C. MUSM 59447 (320 mm TL) both from the río Nanay at Iquitos, Peru.
FIGURE 7 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 7 | Gill arches of Tenebrosternarchus preto, MUSM 54617 (254 mm TL) Ventral arches A. shown in dorsal view and dorsal arches B. in ventral view. Abbreviations: bb, basibranchial; bh, basihyal, cb, ceratobranchial; eb, epibranchial; hb, hypobranchial; iph, infrapharyngobranchial; uptp, upper pharyngeal toothplate.
FIGURE 15 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 15 | Apteronotids collected by ornamental fish wholesalers tentatively identified as male Tenebrosternarchus preto exhibiting hypertrophied jaws and everted teeth. A. Specimen locality unknown, photo courtesy of Kazuyuki Muramatsu. B. Specimen collected in the vicinity of Iquitos, PE, photo courtesy of Minoru Matsuzaka.
FIGURE 6 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 6 | Elements of the ventral hyoid arch of Tenebrosternarchus preto in A. lateral and B. ventral view MUSM 54617 (198 mm TL). Anterior facing left. Abbreviations: br, branchiostegal; cha, anterior ceratohyal; chp, posterior ceratohyal; hhd, dorsal hypohyal; hhv, ventral hypohyal; uh, urohyal.
FIGURE 5 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 5 | Maxilla of Tenebrosternarchus preto. A. MUSM 54617 (198 mm TL) in lateral view; and B. the paired premaxillae of the same specimen in ventral view.
FIGURE 2 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 2 | CT scan reconstructions of Tenebrosternarchus preto, MUSM 59447 (male) 264 mm TL in dorsal A., ventral B., and lateral C. views.
FIGURE 10 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 10 | Pectoral girdle of Tenebrosternarchus preto, MUSM 54617 (198 mm TL) in lateral A., and medial B. views. Abbreviations: cl, cleithrum; co, coracoid; pt, posttemporal; ptg, propterygium; ra, radial; sca, scapula; scl, supracleithrum.
FIGURE 8 in A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus
FIGURE 8 | Cephalic lateral-line bones of Tenebrosternarchus preto, MUSM 54617 (198 mm TL). Abbreviations: ant, antorbital; io, infraorbital; na, nasal; otc, otic canal; mco, mandibular canal ossicles; pa, parietal canal; poc, postotic canal; prc, preopercular canal; soc, supraorbital canal; stc, supratemporal canal; trc, trunk canal.
FIGURE 1 in Melanosternarchus amaru, a new genus and species of electric ghost knifefish (Gymnotiformes: Apteronotidae) from the Amazon Basin
FIGURE 1. Lateral view of Melanosternarchus amaru, holotype MUSM 59405, 230 mm TL.
FIGURE 2 in Melanosternarchus amaru, a new genus and species of electric ghost knifefish (Gymnotiformes: Apteronotidae) from the Amazon Basin
FIGURE 2. Lateral view of two living specimens of Melanosternarchus amaru, ANSP 200459.
Fig. 4 in On Apteronotus magdalenensis (Miles, 1945) (Gymnotiformes: Apteronotidae): a poorly known species endemic to the río Magdalena basin, Colombia
Fig. 4. Electric Organ Discharge (EOD) waveform (left) and Power Spectral Density (PSD) (right) of Apteronotus magdalenensis. (a): IAvH-P 9836, WC 2005-09-27-01, male, 360 mm TL, Nikolsky gonad stage 4 (fully mature). (b): IAvH-P 7026, WC 2005-09- 27-03, female, 326 mm TL, Nikolsky gonad stage 4 (fully mature). Waveforms are plotted head-positivity upwards, time on abscissa (scale bar = 1 ms), voltage on ordinate, horizontal dashed line = 0 volts. PSD were computed by 65536=point fast Fourier transform from 3s digital recordings. Amplitude on ordinate is scaled so that the peak power frequency is 0dB.
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