The Ash Meadows killifish (Empetrichthys merriami) was first documented by C. H. Gilbert (1893) and historically occupied numerous springs near Ash Meadows, Nye County, Nevada.
Fundulus grandis, the Gulf killifish, a fish species in the genus Fundulus
The Gulf killifish, (Fundulus grandis) is currently being used to test the effects of oil and oil dispersants, specifically Macondo 252 crude oil and Corexit 9500, on the physiology of marine species affected by these substances.
The Titicaca Orestias (Orestias cuvieri), also known by its native name Amanto, is a likely extinct freshwater killifish from the genus Orestias, a group of fish which is endemic to the Lake Titicaca and other Altiplano lakes in the Andes.