Pseudochalceus is a genus of characins (tetras) native to river drainages of Colombia, Ecuador, and Venezuela, on the Pacific and northern Andean side of South America. The four species in the atlas are on the larger side for tetras, with adults spanning roughly 2.5–4 in, and share the elongated, laterally compressed, silvery body typical of open-water characins built for steady swimming in flowing streams.
The lined tetra (Pseudochalceus lineatus) and Kyburz tetra (P. kyburzi) are the two species with recorded common names in the atlas, but Pseudochalceus as a whole is only occasionally available in the aquarium trade and is better known to characin specialists than to general hobbyists; detailed, confirmed husbandry notes for the genus are sparse. Conservation status is mixed and not fully resolved — the atlas's tally includes a Vulnerable rating and a Least Concern species alongside two rated Data Deficient, meaning half the genus still lacks enough data for a confident IUCN assessment.