849 GEODIVERSITAS • 2012 • 34 (4) © Publications Scientiiques du Muséum national d’Histoire naturelle, Paris. www.geodiversitas.com KEY WORDS Crustacea, Decapoda, Eryonidae, Eryon, Lectotype, Jurassic, Germany, Solnhofen. Charbonnier S., Garassino A., Pacaud J.-M. & Schweigert G. 2012. — Rediscovery of the type material of Eryon cuvieri Desmarest, 1817 (Crustacea, Decapoda, Eryonidae) and nomen- clatural consequences. Geodiversitas 34 (4): 849-855. http://dx.doi.org/10.5252/g2012n4a7 ABSTRACT In 1817, Desmarest erected Eryon cuvieri, a new crustacean from the Late Jurassic of Bavaria (southern Germany). Later, the same taxon was described as Macrourites arctiformis by von Schlotheim (1820). Subsequently, numerous authors, probably unaware of Desmarest’s irst paper, referred to this taxon as Eryon arctiformis (von Schlotheim, 1820). Following the Principle of Priority, the original name must be used and Macrourites arctiformis von Schlotheim, 1820 is here considered to be a more recent, subjective synonym. Moreover, two specimens of the type series of Eryon cuvieri Desmarest, 1817, from Faujas de Saint-Fond’s Cabinet of Natural History, have recently been traced in the Collection de Géologie of the Muséum national d’Histoire naturelle, Paris. A lectotype is herein designated. Sylvain CHARBONNIER Muséum national d’Histoire naturelle, Département Histoire de la Terre, UMR 7207 CNRS, Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, case postale 38, 57 rue Cuvier, F-75231 Paris cedex 05 (France) scharbonnier@mnhn.fr Alessandro GARASSINO Museo di Storia Naturale di Milano, Sezione di Paleontologia, Corso Venezia 55, I-20121 Milano (Italy) alegarassino@gmail.com Jean-Michel PACAUD Muséum national d’Histoire naturelle, Département Histoire de la Terre, UMR 7207 CNRS, Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, case postale 38, 57 rue Cuvier, F-75231 Paris cedex 05 (France) pacaud@mnhn.fr Günter SCHWEIGERT Staatliches Museum für Naturkunde, Rosenstein 1, D-70911 Stuttgart (Germany) guenter.schweigert@smns-bw.de Rediscovery of the type material of Eryon cuvieri Desmarest, 1817 (Crustacea, Decapoda, Eryonidae) and nomenclatural consequences