Callopanchax is a genus of killifish in family Nothobranchiidae, native to forest streams and swamps of coastal West Africa - the atlas's 4 species are recorded from Guinea, Liberia, Sierra Leone, and Nigeria. They are small, colorful fish, from about 2.5–3 in, and unlike the classic annual Nothobranchius of the East African savanna, most Callopanchax live in more permanent forest water and are not strict annual species that must dry out and re-hatch each year, though some do use soft substrate or leaf litter for egg deposition.
Males in this genus show striking blue, red, and turquoise coloration, which has made species like the West African killifish (C. occidentalis) and Todd's killifish (C. toddi) long-standing favorites among specialist killifish keepers, who typically keep them in soft, acidic, densely planted setups mimicking shaded forest streams. The conservation picture is more serious here than in many small killifish genera: one of the four atlas species is assessed Critically Endangered, reflecting the intense deforestation and small-scale mining pressure on West African forest streams, while two others are assessed Least Concern and one is Not Evaluated.