Facultative air-breathing in the genus ; Usually found in floating meadow habitats on the margins of the Amazonas/Solimões River and its tributaries. Often collected with Brachyhypopomus walteri .
Anal soft rays: 227 - 255. Electric organ present along caudal filament and along body above anal fin exceedingly deep and visible as large semi-translucent area, occupying approximately 14-17% body depth directly posterior to abdominal cavity; and monophasic, headpositive electric organ discharge (EOD) waveform, approximately 2.1 milliseconds in duration in both sexes at 25°C .: elongated.
Behavioural data for Brachyhypopomus Bennetti is currently being reviewed.
Freshwater; brackish; benthopelagic. Tropical South America: Amazon Basin.
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