Considered a synonym of Atractosteus spatula (Lacepède, 1803)
- Wiley, E.O. 1976. "The phylogeny and biogeography of fossil and recent gars (Actinopterygii: Lepisosteidae)". University of Kansas Museum of Natural History, Miscellaneous Publications. (64):1-111 (ffm00291)
Original description as Litholepis adamantinus:
- Rafinesque, Constantine Samuel. 1818. "Further discoveries in natural history, made during a journey through the western region of the United States". American Monthly Magazine and Critical Review. 3(6):445-447(oct) (ffm04556)