Ma, Junye; Taylor, Paul D.; Xia, Fengsheng; Zhan, Renbin (September 2015). «The oldest known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south-western Hubei, central China». Palaeontology58 (5): 925–934. doi:10.1111/pala.12189.