Gymnotiformes and Mormyridae have developed their electric organs and electrosensory systems (ESSs) by means of convergent evolution. As Arnegard et al. 140 to 208 Mya, and presently they didn’t possess ESSs. Every species of Mormyrus (family: Mormyridae) and Gymnotus (family: Gymnotidae) have developed a unique waveform that allows the person fish to determine between species, genders, people and even between mates with higher fitness ranges. The variations embrace the route of the preliminary phase of the wave (constructive or unfavourable, which correlates to the route of the current by means of the electrocytes within the electric organ), the amplitude of
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