30750 - Well Preserved 2.61 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Monte Bolca Fossil Fishes Tengfengiidae

Tengfengiidae

is an iron sulfide with the chemical formula FeS2 (iron(II) disulfide)

Lieberman and Kloc 1997 (trilobite)

Not only the tooth belongs to an inusual theropod family

30750 - Well Preserved 2.61 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Monte Bolca Fossil Fishes TengfengiidaeCrotalocephalina 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,