FIGURE 12 in Melanosternarchus amaru, a new genus and species of electric ghost knifefish (Gymnotiformes: Apteronotidae) from the Amazon Basin

FIGURE 12. Head-to-tail electric organ discharge (ht-EOD) waveform (A) and corresponding power spectral density (PSD) (B) for Melanosternarchus amaru, ZUEC 14195, specimen 1999-01-28-23, female, 272 mm TL; Paraná Maiana, rio Solimões- Japurá confluence, near Alvarães, Amazonas, Brazil. The ht-EOD waveform is plotted head-positive with relative voltage on the ordinate and absolute time on the abscissa. Horizontal dashed line denotes 0V. The PSDs is computed by 65536-point Fast Fourier Transform and is scaled to report the peak power frequency (PPF) at 0 decibels. The PPF at 1.884 kHz corresponds to the first harmonic. The dominant ht-EOD frequency is at 0.942 kHz.