Feeds on autochthonous micro-algae and detritus in a swamp (Urubaxi, Brazil) and on allochthonous invertebrates and detritus in an island lake (Buiú-Açu, Brazil).
Dorsal soft rays (total): 5 - 6; Anal soft rays: 7 - 8; Vertebrae: 27. Absence of an expanded upper tip of the cleithrum, a plesiomorphic condition that distinguishes this species from its congeners; anterior portion of supraorbital, postorbital and upper portion of preopercular canals closed; pelvic fin of males short, tip reaching base of third anal-fin ray; anal fin of males rounded and short, tip reaching a vertical through middle of dorsal-fin base; mesethmoid rounded; anterodorsal process of opercle short; ventral process of posttemporal elongate; branchiostegal rays 5; rostral cartilage present.: elongated.
Behavioural data for Fluviphylax Obscurus is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: Upper Rio Negro basin.
autochthonous micro-algae and detritus in a swamp (Urubaxi, Brazil) and on allochthonous invertebrat
The following diseases are known to affect Fluviphylax Obscurus.
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