Trilobita - Asaphida - Dikelocephalidae

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

Sister taxa: Briscoia, Dikelocephalus, Monocheilus, Princetonella, Pterocephalops

Subtaxa: Stigmacephalus flexifrons, Stigmacephalus hudsonensis

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Ecology: fast-moving low-level epifaunal deposit feeder