Trilobita - Ptychopariida - Marjumiidae

Full reference: J.L. Wilson. 1954. Late Cambrian and Early Ordovician Trilobites from the Marathon Uplift, Texas. Journal of Paleontology 28(3):249-285

Parent taxon: Marjumiidae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Armonia, Holmdalia, Ithyektyphus, Marjumia, Modocia, Nericella, Pearylandia, Shickshockia, Syspacheilus

Subtaxa: Nasocephalus nasutus

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Type: Nasocephalus nasutus

Ecology: fast-moving low-level epifaunal carnivore