Mesolimulus walchii ( Desmarest, 1817 )

Odin, Giliane P., Charbonnier, Sylvain, Devillez, Julien & Schweigert, Günter, 2019, On unreported historical specimens of marine arthropods from the Solnhofen and Nusplingen Lithographic Limestones (Late Jurassic, Germany) housed at the Muséum national d’Histoire naturelle, Paris, Geodiversitas 41 (17), pp. 643-662: 658

publication ID 10.5252/geodiversitas2019v41a17

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Mesolimulus walchii ( Desmarest, 1817 )


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

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


Specimen MNHN.F. B13432 View Materials ( Fig. 11A View FIG ) 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 View FIG ). Such crystals are believed to be formed during the early stage of diagenesis, due to microbial activity. Specimen MNHN.F. B13433 View Materials ( Fig. 11B View FIG ) is a dorsal view of a slightly deformed specimen; the prosoma, carapace and telson are beautifully preserved.


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.