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Journal of Paleontology

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NOTCHPEAKIA, A NEW GENUS OF UPPER CAMBRIAN (SUNWAPTAN) "ENTOMASPIDID" TRILOBITES

¹ Department of Geoscience, University of Iowa, 121 Trowbridge Hall, Iowa City 52242, <jonathan-adrain{at}uiowa.edu>
² Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, 2401 Chautauqua Avenue, Norman 73072, <swestrop{at}ou.edu>

Trilobites previously assigned to the Entomaspididae Ulrich in Bridge, 1931 are common in Laurentian strata assigned to the upper Sunwaptan Stage of the Upper Cambrian. Most species are poorly known, and typically only sparse cranidial data are available. Large silicified samples from the Lava Dam Member of the Notch Peak Formation, western Utah, contain three new species for which cranidia, librigenae, thoracic segments, and pygidia are known. The species permit clarification of the morphology and affinities of previously described taxa from elsewhere. They are referred to Notchpeakia n. gen. (type species: N. milleri n. sp.) which, in addition to the type includes N. taylori n. sp., N. notchpeakensis n. sp., N. cherrycreekensis n. sp., and N. varga (Westrop, 1986). The "entomaspidid" trilobites are assigned to the traditionally post-Cambrian Harpetidae Hawle and Corda, 1847.

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