Uznawany jako synonim Fundulus similis (Baird & Girard, 1853)
- Lazara, K.J. 2001. "The killifishes, an annotated checklist, synonymy, and bibliography of recent oviparous Cyprinodontiform fishes". The killifish master index. 4:1-624 (ffm00080)
Oryginalny opis jako Fundulus similis insularis:
- Gilbert, Carter R.. 1978. "Of special concern Longnose Killifish (keys subspecies)". Rare and endangered biota of Florida. State of Florida Game and Fresh Water Fish Commission. 4:52-53 (ffm00208)