[1]
Adrain, J.M. and Mcadams, N.E.B. 2012. The Lower Ordovician (upper Floian) bathyurid trilobite Aponileus Hu, with species from Utah, Texas, and Greenland. Zootaxa. 3293, 1 (Apr. 2012), 1–67. DOI:https://doi.org/10.11646/zootaxa.3293.1.1.