Ischyrhiza
It is from the Hamadasuchus rebouli species
Trilobita - Redlichiida - Paradoxididae
the analysed sample is similar to a basalt or hypabyssal igneous rock (Le Maître et al
30245 - Gorgeous 3.55 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Amethyst IschyrhizaNice 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,