†Protoryctocara T-M Zhou

T-M Zhou. [Trilobita.] Wang, Xiao-feng; Jin, Yu-qin[Eds]. [Paleontological Handbook of central and southern China. pt. 1. Early Palaeozoic Era.], Earth Sciences Press, Peking, 1977: 1-470, 116 pls.. Chapter pagination: 104-266, pls.33-81