30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus one of the three most

one of the three most common naturally occurring crystal forms of calcium carbonate

and other fossils described are G

it features an outstanding preservation

Only has small glued fracture

Upper Llanvirnian

30236 - Top Beautiful 2.81 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Hexanchus one of the three mostNice and well prepared specimen. Crotalocephalina 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,