Turseodus is an extinct genus of ray-finned fish found in Late Triassic freshwater sediments of the United States. Two species have been described, T. acutus from the Lockatong Formation (Carnian stage) of Pennsylvania, and T. dolorensis from the Chinle Formation (Norian stage) of Colorado.
Classification
Although previously placed in the paraphyletic family Palaeoniscidae, Turseodus was later referred to its own family, Turseoidae, by Wilhelm Bock. The lachrymal bone of Turseodus forms part of the oral margin, an unusual condition known otherwise only from the Early to Middle Triassic Pteronisculus. Based on this synapomorphy and other similarities, a close relationship between Turseodus and Pteronisculus is hypothesized. There are also similarities with Turfania from the Permian of China. However, a close evolutionary relationship between these genera has not yet been tested by cladistic analyses.