This species inhabits shallow, running water with substrate composed of pebbles, rocks, sand, and organic litter from the surrounding marginal vegetation .
Dorsal spines (total): 2; Dorsal soft rays (total): 6; Anal soft rays: 5 - 6. This species is distinguished from its congeners by the following set of characters: dark brown vertical bar below the dorsal-fin base not confluent with a dark brown bar below the adipose-fin base; abrupt thinning of the subdorsal dark brown bar ventrally; dark brown spots sparsely distributed on the body; solid dark brown bar on caudal peduncle; posterior tip of the post-cleithral process reaching vertical through the base of the dorsal-fin spine; long distance of anus to anal-fin origin (mean = 11.4±0.8%), maxillary barbel length (mean = 79.6±5.8%), and caudal peduncle depth (mean = 9.5±0.5%); minor posterior nostril to eye distance (mean = 4.8±0.9%), body depth (mean = 18.2±1.5%), and postcleithral process length (mean = 12.9±1.1%); anterior serrae distributed along the entire margin .Cross section: oval.
Behavioural data for Rhyacoglanis Varii is currently being reviewed.
Diet information for Rhyacoglanis Varii is currently being compiled.
Reproduction data for Rhyacoglanis Varii is currently being compiled.
Freshwater; demersal. Tropical South America: Brazil.
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