Adrain JM, Mcadams NEB, Karim TS. The Middle Ordovician bathyurid trilobite Pseudoolenoides, with a revised trilobite biostratigraphy of the Dapingian and lower Darriwilian of western Laurentia. Zootaxa [Internet]. 2012 Sep. 7 [cited 2025 Apr. 3];3467(1):1–97. Available from: https://mapress.com/zt/article/view/zootaxa.3467.1.1