長鼻目Elephantoidea Gray, 1821 †Anancidae Hay, 1922 †Anancus Aymard, 1855 †Morrillia Osborn, 1924 †Paratetralophodon Tassy, 1983 †Pediolophodon Lambert, 2007
マルコム・マッケナEvolution 9 (3): 572–584. Shoshani, J.; McKenna, M.C.; Bell, S.K. (1996). “Morrillia, subgenus or genus?”. Journal of Vertebrate Paleontology 16 (3, suppl