Mesolimulus walchii (Desmarest, 1817) (Fig. 11)

STUDIED MATERIAL. — Charbonnier & Garassino (2012) listed four specimens from Solnhofen (MNHN.F. A33516, B13432, B13433; MNHN.GG.2004/7473) but figured only one specimen (MNHN.F. A33516). We do not change their contribution.

COMMENTS

Specimen MNHN.F.B13432 (Fig. 11A) is poorly preserved and exhibit many calcite bundles (as dumbells and spheres), mostly at the rear of the prosoma.According to Briggs & Wilby (1996), among the arthropods of Solnhofen, Mesolimulus is the taxon the most commonly subject to calcite crystals bundles development (we illustrate a specimen of Eryon cuvieri with calcite bundles on Fig. 9B). Such crystals are believed to be formed during the early stage of diagenesis, due to microbial activity. Specimen MNHN.F.B13433 (Fig. 11B) is a dorsal view of a slightly deformed specimen; the prosoma, carapace and telson are beautifully preserved.

Acknowledgements

We thank Lilian Cazes (CR2P, MNHN) for assistance in photographic work. This paper is a contribution from the UMR CNRS 7207 Centre de Recherche en Paléontologie – Paris, and part of the ‘PyrEx’ project, funded by the DIM Matériaux Anciens et Patrimoniaux. We also would like to thank Denis Audo and Alessandro Garassino for their useful comments on a previous version of the manuscript.