30202 - Gorgeous 3.39 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Altiocculus harrisi Under polarized-light microscope (crossed light)

Under polarized-light microscope (crossed light)

Rebbachisaurus is a genus of sauropod dinosaur of the superfamily Diplodocoidea

known from remains throughout North America

ptychodon is quite distinct from those of other mosasaurids

Mexico (1)

30202 - Gorgeous 3.39 Inch Crotalocephalina (Crotalocephalus) gibbus Lower Devonian Trilobite Altiocculus harrisi Under polarized-light microscope (crossed light)Nice 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,