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Project 5328: J.M. Adrain, S.R. Westrop, E. Landing, R. A. Fortey. 2001. Systematics of the Ordovician trilobites Ischyrotoma and Dimeropygiella, with species from the type Ibexian area, western U.S.A. Journal of Paleontology. 75 (5):947-971.
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M908223
† Ischyrotoma twenhofeli
whole specimen (fossil)