Known from the type locality which is a small creek with clear water and slow to moderate current, with loose stones, and in some places, mud on the bottom. Low vegetation are found along stream margins .
Dorsal soft rays (total): 12 - 14; Anal soft rays: 9. Dark spots on dorsal fin form a continuous band across rays; anterior portion of anal fin of males with one or two conspicuous dark blotches, followed by smaller spots on the posterior portion. The third or fourth ray of the pelvic fin longest, reaching the area between anal opening and anal fin origin or reaching anal fin origin .
Behavioural data for Characidium Occidentale is currently being reviewed.
Freshwater; benthopelagic. Subtropical South America: left bank tributaries of the middle Uruguay River basin in Brazil (Ref.
The following diseases are known to affect Characidium Occidentale.
Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .
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