Wallaciia Urosema (Wallaciia urosema) is a ray-finned fish. It inhabits freshwater waters. This species can reach a maximum total length of 6.9 cm. With a trophic level of 3.2, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Endangered on the IUCN Red List.
Differs especially by the large dark, unocellated blotch at the base of the caudal fin between rays D6 and V2 or V3, and the uniformly brownish sides. .: elongated.
Behavioural data for Wallaciia Urosema is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: Amazon River basin, in the Tapajós River at São Luiz, Brazil.
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