Article: A new actinopterygian fish from the Mississippian Bear Gulch Limestone of Montana

A new genus and species of tarrasiiform fish is described from the Chesterian (Upper Mississippian) Bear Gulch Limestone member of the Heath Formation, Montana, U.S.A. Among the distinguishing osteological features of the order that can now be established are premaxillae sutured in the midline, separate rostral and postrostral bones, two pairs of nasals, and a skull roof consisting of paired frontals, parietals, and postparietals. A tentative relationship is proposed with the base of the radiation of the order Palaeonisciformes.