Mcadams NE, Adrain JM, Karim TS.

The pliomerid trilobite Ibexaspis and related new genera, with species from the Early Ordovician (Floian; Tulean, Blackhillsian) of the Great Basin, western USA

. Zootaxa [Internet]. 2018 Nov. 27 [cited 2025 Jul. 1];4525(1):1–152. Available from: https://www.mapress.com/zt/article/view/zootaxa.4525.1.1