Original description as Cyprinodon longidorsalis:
- Lozano Vilano, María de Lourdes & S. Contreras-Balderas. 1993. "Four new species of Cyprinodon from southern Nuevo León, Mexico, with a key to the C. eximius complex (Teleostei: Cyprinodontidae)". Ichthyological Explorations of Freshwaters. 4(4):295-308 (ffm00176)
Conservation: Cyprinodon longidorsalis is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (EW) extinct in the wild (1996).