Latonia ragei was named by Hossini (1993). Its type specimen is FSL: 150.80, a maxilla (An almost complete right maxilla, with its processus posterior and tips of the processus pterygoideus and processus palatinus broken off), and it is a 3D body fossil. Its type locality is Laugnac, which is in a MN 2 lacustrine marl/limestone in the Agenais Limestone Formation of France.