Re-appraisal of thylacocephalans (Euarthropoda, Thylacocephala) from the Jurassic La Voulte-sur-Rhône Lagerstätte Author Laville, Thomas EDDB1B51-2017-405B-9A92-52EA900A13CA Muséum national d’Histoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France. & Biogéosciences, UMR 6282 CNRS, Université de Bourgogne, 6 boulevard Gabriel, 2100 Dijon, France. thomas.laville2@mnhn.fr Author Forel, Marie-Béatrice 063C1F7E-6D26-48F9-A8B1-2AFA496B5FB8 Muséum national d’Histoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France. marie-beatrice.forel@mnhn.fr Author Charbonnier, Sylvain 2B4CC15F-FB7A-4AAF-8CB5-365E976850FA Muséum national d’Histoire naturelle, Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), Sorbonne Université-MNHN-CNRS, 57 rue Cuvier, 75005 Paris, France. sylvain.charbonnier@mnhn.fr text European Journal of Taxonomy 2023 2023-10-05 898 1 1 61 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2295/9941 journal article 10.5852/ejt.2023.898.2295 2118-9773 8413500 87EE2C76-1DDC-40DE-87E7-4D0E11A312DC Genus Mayrocaris Polz, 1994 Type species Mayrocaris bucculata Polz, 1994 by monotypy. Original diagnosis (literal translation from Polz 1994 ) Carapace subtrapezoid, without a clearly delineated optic notch, however, with a pronounced subquadratic notch; ventral line from here slopping down at 45° angle, almost equally ascending from the middle of the carapace, forming, together with the lowest part of the anterior margin, a characteristic U-shaped bulge; hinge line on the whole slightly convex, terminating in a pointed spine; rostrum inconspicuous; carapace surface roughly sculptured only by a short horizontal, very delicate ridge, and by eight small bases of spines, micro-relief in the form of single, very small arched lines on an ultrafine faveolated surface; anterior lobes larger than in comparable genera, protruding from the carapace not only anteriorly, but even projecting over its antero-ventral section; abdomen segmented. Kind of large appendages not clausocarid, course of anterior carapace margin conchyliocarid. Emended diagnosis Thylacocephala with a slightly developed optic notch, a serrate dorsal margin consisting of a carina, a rounded postero-dorsal spine, a posterior notch, and an anterior part of the ventral margin oriented antero-dorsally and bearing a square notch.