30424 - Well Preserved 0.31 Inch Peronopsis interstrictus Middle Cambrian Trilobite - Utah USA Raptor Olivine shows a thin rim

Olivine shows a thin rim (Figs

Premaxillary tooth

Ceraurinus

The main difference between them is the formation of iddingsite rim in olivine grains

60°19’19

30424 - Well Preserved 0.31 Inch Peronopsis interstrictus Middle Cambrian Trilobite - Utah USA Raptor Olivine shows a thin rimPeronopsis, Corda 1847 (trilobite) Trilobita Agnostida Peronopsidae PaleoDB taxon number: 19293 Synonym: Itagnostus Opik 1979 (taxon 19247) Parent taxon: Peronopsidae according to H. B. Whittington et al. 1997 See also Henningsmoen 1952, Jell and Adrain 2002, Palmer and Gatehouse 1972, Palmer and Halley 1979, Robison 1995 and Sepkoski 2002 Sister taxa: Archaeagnostus, Diplorrhina, Peronopseinae, Peronopsella, Phalacrominae, Svenax Subtaxa: Peronopsis