†Ptyocephalus vigilans Whittington 1948 (trilobite)
Trilobita - Asaphida - Asaphidae
Full reference: H. B. Whittington. 1948. A new Lower Ordovician trilobite. Journal of Paleontology 22(5):567-572
Belongs to Ptyocephalus according to H. B. Whittington 1948
Sister taxa: Ptyocephalus accliva, Ptyocephalus declevita
Ecology: fast-moving low-level epifaunal deposit feeder