Original description as Hydrargyra similis:
- Baird, Spencer F. & C.F. Girard. 1853. "Descriptions of new species of fishes collected by Mr. John H. Clark, on the U. S. and Mexican Boundary Survey, under Lt. Col. Jas. D. Graham". Proceedings of the Academy of Natural Sciences of Philadelphia. 6:387-390 (ffm04562)
- Fundulus similis insularis Relyea, 1978, with type locality at Not available. Determiner: Lazara, 2001
Conservation: Fundulus similis is not evaluated by the international union for the conservation of nature in the iucn red list of threatened species.