ammonites
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