Facultative air-breathing in the genus ; Occurs in swamps, slow moving river edges and standing water, often with dense vegetation .
Anal soft rays: 155 - 190. Can be differentiated from all congeners by the following combination of characters: pigmentation pattern of body consisting of scattered dark brown pigmentation over a brown background, more dense on the dorsal half of the body; epidermal laterosensory canals pigmented; head depth 61.8-76.4% of HL; caudal filament length 6.5-16.6% of ; 55-190 anal-fin rays; fourth supraorbital pore dorsal and half-way between posterior nares and anterior margin of orbit; upper jaw slightly longer than lower jaw; a cartilaginous mesocoracoid; slender anterodorsal process of the maxilla; all branchiostegal rays of equal size, none hook-like .
Behavioural data for Brachyhypopomus Bombilla is currently being reviewed.
Freshwater; benthopelagic; pH range: 6.0 - 7.8. Subtropical; 19°C - 29°C South America: tributaries of the middle Río Uruguay and Los Patos-Merín system basin in Uruguay.
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