Mcadams, N.E.B. and Adrain, J.M. 2010.

A new species of the Lower Ordovician pliomerid trilobite Pseudocybele and its biostratigraphic significance

. Zootaxa. 2550, 1 (Jul. 2010), 21–38. DOI:https://doi.org/10.11646/zootaxa.2550.1.2.