30711 - Well Preserved 3.37 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Pterocephalia norfordi Trilobita - Asaphida

Trilobita - Asaphida

Subtaxa: Trinucleus seticornis

Ecology: nektonic carnivore

Tooth 4: 50 mm (1

Agraulos quadrangularis

30711 - Well Preserved 3.37 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Pterocephalia norfordi Trilobita - AsaphidaCrotalocephalina sp, Pibyl and Vanek 1964 (trilobite) Trilobita Phacopida Cheiruridae Parent taxon: Cheiruridae according to P. A. Jell and J. M. Adrain 2002 See also Sepkoski 2002 Sister taxa: Acanthoparyphinae, Anasobella, Ancyginaspis, Arcticeraurinella, Areia, Areiaspis, Borealaspis, Bornholmaspis, Ceraurinium, Ceraurinus, Cerauroides, Cerauromeros, Cerauropeltis, Ceraurus, Chacomurus, Cheirurinae, Cheirurus, Chiozoon, Contracheirurus,