Original description as Etheostoma segrex:
- Norris, Steven & R.R. Miller. 1997. "Two new species of Etheostoma (Osteichthyes: Percidae) from Central Coahuila, northern México". Ichthyological Explorations of Freshwaters. 8(2):159-176 (ffm00339)
Conservation: Etheostoma segrex is not evaluated by the international union for the conservation of nature in the iucn red list of threatened species. This species has not been found after an extensive search at the type locality and other associated areas during 2013. It is at least in a very precarious condition, and probably extinct.