Hardistiella montanensis is an extinct species of lamprey, found, dating from the Carboniferous period, at the Bear Gulch Limestone site in the U.S. state of Montana.P. Janvier and R. Lund. 1983. Hardistiella montanensis n. gen. et sp. (Petromyzontida) from the Lower Carboniferous of Montana, with remarks on the affinities of the lampreys. Journal of Vertebrate Paleontology 2(4):407-413
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