Here is a interesting "Solnhofen Lobster" of the genus Eryma with plain pincers.
Compared to  Eryma modestiforme does show this Eryma no pusulation on the base of the pincers.
This is a imported species feature on crustaceans, so it is possible  that it is a new species of  Eryma from Solnhofen. The Eryma itself measures about 29 mm.

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