^ abWhitley, G. P. (1949–1950). "New fish names and records"(PDF). Proceedings of the Royal Zoological Society of New South Wales. 70: 67. ISSN0373-4129. OCLC3925828. Retrieved 1 August 2018. EuptychaspisWhite & Moy-Thomas, Ann. Mag. Hist. (11), vii., 1941, p. 398, preocc. — Murmur, nov. (Acanthaspidae). Type, M. arctatum (Bryant).
^White, Errol I.; Moy-Thomas, James Alan (1941). "XXV.—Notes on the Nomenclature of Fossil Fishes.— Part III. Homonyms M-Z". Annals and Magazine of Natural History. 11. 7 (40): 398. doi:10.1080/03745481.1941.9727941. ISSN0374-5481. OCLC5497152624. Ptychaspis Bryant,1935, Proc. Amer. Phil. Soc. lxxv. 11. 127, non Hall, 1863, Ann. Rep. N.Y. Cab. xvi. app. D, p.170 (Trilob.), is renamed Euptyehaspis, nom. nov.
^ abBryant, William L. (June 1935). "Cryptaspis and Other Lower Devonian Fossil Fishes from Beartooth Butte, Wyoming". Proceedings of the American Philosophical Society. 75 (2): 127–128. JSTOR984532.