30575 - Beautiful Mortality Plate of Trinucleus fimbriatus Ordovician Trilobites - UK Septarian nodules It preserves its lateral serrations

It preserves its lateral serrations very well defined

This trilobites have been prepared as partial free-standing

Average measurements (in mm): length 20

Ischyrhiza

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 It preserves its lateral serrationsTrinucleus, 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,