Genus Mecochirus Germar, 1827 TYPE SPECIES. — Macrourites longimanatus Schlotheim, 1820, by subsequent designation of Woods (1927). Mecochirus longimanatus (Schlotheim, 1820)(Fig. 8) STUDIED MATERIAL. — Charbonnier & Garassino (2012) listed 27 specimens including two specimens described as Mecochiria foresti by Secrétan (1968). We add a new specimen from Solnhofen (MNHN.F.A70929). COMMENTS We localized the type material of Mecochiria foresti Secrétan, 1968. She listed five syntypes but figured only two (MNHN.F. A33537: Fig. 8A, B; A 33539: Fig. 8F, G), which are dorsoventrally flattened. According to Förster (1971), these specimens show diagnostic characters of Mecochirus longimanatus, and Mecochiria is a junior synonym of Mecochirus. This view was followed by Schweitzer et al. (2010: 20), who, however, maintained Mecochirus foresti as a separate species. Our examination of the two syntypes did not evidence any significant morphological differences to distinguish two species. Hence, we consider M. foresti as a junior synonym of M. longimanatus. Specimen MNHN.F.A70929 (Fig. 8 C-E) arrived in the MNHN collections in December 1930, through Mr Gravigny, Charles Brongniart’s son-in-law. The carapace exhibits the typical cervical groove and the orbital and gastro-orbital carinae. P1 is very elongate and P2 shows a strong and stout propodus as described by Garassino & Schweigert (2006). Infraorder POLYCHELIDA Scholtz & Richter, 1995

Published as part of 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, pp. 643-662 in Geodiversitas 41 (17) on page 654, DOI: 10.5252/geodiversitas2019v41a17, http://zenodo.org/record/3695414