World Register of Marine Species (WoRMS)
Decker, P.; Sierwald, P.; Spelda, J.; Barber, A.D.; Antic, D.; Bouzan, R.; Enghoff, H.; Hennen, D.; Iniesta, L. F. M.; Means, J.; Nguyen, A. D.; Simmons, E.; Wesener, T. (2026). MilliBase. Macromastus umpqua Shear, 1984. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=935389 on 2026-08-29
Shear, W. A. (1984). Cave millipeds of the United States. III. Two new species from the western states. (Diplopoda: Polydesmida, Chordeumatida). Myriapodologica, 1 (14): 95-104. Radford