Occurs mostly in floodplains of large rivers, where it is frequently collected together with Rhamphichthys drepanium and R. marmoratus.
: elongated.
Behavioural data for Marsh knifefish is currently being reviewed.
Diet information for Marsh knifefish is currently being compiled.
Reproduction data for Marsh knifefish is currently being compiled.
Freshwater; demersal. Tropical South America: Solimões and Amazon rivers in Brazil upstream of the mouth of the Madeira River; also from a single locality in the Guaporé River in Brazil.
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