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Ischyrhiza
Resser 1939 (trilobite)
Alternative combination: Calymene meeki retrorsa
It comes from the famous sites of the Hell Creek Formation in Montana (Maastrichtian stage
30575 - Beautiful Mortality Plate of Trinucleus fimbriatus Ordovician Trilobites - UK Septarian nodules IschyrhizaTrinucleus, Murchison 1839 (trilobite) Trilobita Asaphida Trinucleidae PaleoDB taxon number: 20223 Parent taxon: Trinucleidae according to P. A. Jell and J. M. Adrain 2002 See also Sepkoski 2002 Sister taxa: Anebolithus, Bergamia, Bettonolithus, Botrioides, Cryptolithinae, Cryptolithoides, Cryptolithus, Deanaspis, Declivolithus, Decordinaspis, Famatinolithus, Furcalithus, Guandacolithus, Gymnostomix, Hanchungolithinae, Hanchungolithus, Incaia,