Pseudopoecilia is a small genus of livebearing fish in family Poeciliidae, restricted to Pacific-slope drainages of Ecuador, Colombia, and Peru. The atlas's three species are tiny, 1–2 in, among the smallest livebearers in the family, and like other poeciliids they bear live young rather than laying eggs. Beyond that basic biology the genus is poorly documented in the literature - it has not attracted the research attention given to better-known livebearer genera, and much of its natural history remains genuinely under-described.
Pseudopoecilia has essentially no presence in the aquarium trade; it is a genus of scientific rather than ornamental interest. Two of the three atlas species are rated Data Deficient by IUCN, meaning there simply isn't enough information to assess their conservation status, while the third is Least Concern. That data gap is itself telling: small, range-restricted livebearers on the Pacific slope of the northern Andes are easy for surveys to miss, and their true exposure to habitat pressure in the region is not well known.