Rhexipanchax is a genus of small West African killifish (order Cyprinodontiformes) restricted, per the atlas record, to the Upper Guinean forest belt - Guinea, Liberia, Sierra Leone, Cote d'Ivoire, and Ghana. Common names in the atlas, Lambert's lampeye and Mt. Nimba lampeye, point to a lampeye-type build: an upturned mouth and a dorsally set, reflective eye adapted for feeding near the surface of shaded forest streams and pools. The four atlas species are tiny, 1.5–2 in, typical of small forest-stream killifish that live and breed in a confined stretch of habitat rather than ranging widely.
This is a genus known mainly to killifish specialists rather than the general aquarium trade - lampeye-type West African species are kept by a dedicated niche within the hobby, valued for their shimmering eyes and shoaling habits in soft, acidic water that mimics shaded forest streams, but they rarely appear in general fish stores. The conservation picture is a real concern: two of the four atlas species are rated Vulnerable against two Least Concern, none evaluated as secure across the board. That pattern fits a genus confined to small, forest-dependent streams in a region - the Upper Guinean forest hotspot, which includes the heavily mined Mt. Nimba massif - under sustained pressure from deforestation and habitat conversion; data on population trends specifically remain sparse.