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Mcadams, N.E., Adrain, J.M. and Karim, T.S. 2018.

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

. Zootaxa. 4525, 1 (Nov. 2018), 1–152. DOI:https://doi.org/10.11646/zootaxa.4525.1.1.