A rheophilic species, prefer rapids and other swift-flowing waters. Possibly rare, known only from two preserved specimens collected in widely separated areas from the southern portions of the Rio Orinoco basin .
Vertebrae: 34 - 35. This species can be distinguished from congeners by the presence of caudal-peduncle band with an unpigmented central region (vs. band uniformly dark), and a larger distance between anus and anal-fin origin .Cross section: oval.
Behavioural data for Rhyacoglanis Annulatus is currently being reviewed.
Freshwater; demersal. Tropical South America: Venezuela.
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