Requested reference
Platnick, N. I. & Shadab, M. U. (1980a). A revision of the North American spider genera Nodocion, Litopyllus, and Synaphosus (Araneae, Gnaphosidae). American Museum Novitates 2691: 1-26. 
-- Show included taxa
Platnick, N. I. & Shadab, M. U. (1980a). A revision of the North American spider genera Nodocion, Litopyllus, and Synaphosus (Araneae, Gnaphosidae). American Museum Novitates 2691: 1-26. -- Show included taxa