^Robert W. Boessenecker, Ashley W. Poust, Sarah J. Boessenecker and Morgan Churchill. 2024. Tusked Walruses (Carnivora: Odobenidae) from the Miocene–Pliocene Purisima Formation of Santa Cruz, California (U.S.A.): A New Species of the Toothless Walrus Valenictus and the Oldest Records of Odobeninae and Odobenini. Journal of Vertebrate Paleontology. e2296567. DOI: 10.1080/02724634.2023.2296567