Project 4749: R. E. Swisher, S. R. Westrop, L. Amati. 2016. Systematics and paleobiogeographic significance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935. Journal of Paleontology. 90 (1):59-77.
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Swisher, R. E., Westrop, S. R. and Amati, L. 2016. Systematics and paleobiogeographic significance of the Upper Ordovician pterygometopine trilobite Achatella Delo, 1935. Journal of Paleontology. Vol. 90(1), pp. 59-77.