Review of brachyuran crabs from the late Miocene (Messinian) of Oran, Algeria Author Charbonnier, Sylvain Centre de Recherche en Paléontologie - Paris (CR 2 P, UMR 7207), MNHN, CNRS, Sorbonne Université, Muséum national d’Histoire naturelle, 57 rue Cuvier, F- 75231 Paris, cedex 05 (France) sylvain. charbonnier @ mnhn. fr (corresponding author) sylvain.charbonnier@mnhn.fr Author Garassino, Alessandro Department of Earth and Biological Sciences, Loma Linda University, Loma Linda, 92350 CA (United States) alegarassino @ gmail. com alegarassino@gmail.com Author Pasini, Giovanni Via Alessandro Volta, 16 22070 Appiano Gentile (Italy) giovannialdopasini @ gmail. com giovannialdopasini@gmail.com Author Chény, Cédric Géosciences Rennes, UMR 6118, CNRS Université de Rennes, F- 35000 Rennes (France) text Geodiversitas 2024 2024-01-25 46 2 13 29 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/g2024v46a2.pdf journal article 10.5252/geodiversitas2024v46a2 1638-9395 10566276 urn:lsid:zoobank.org:pub:A141C894-DEC7-42FD-BC7C-2A8A692B0A31 Cancer sismondai Meyer, 1843 ( Fig. 4 A-E) Cancer sismondae Meyer, 1843: 590 . Cancer deshayesii A. Milne-Edwards, 1864a: 74-76 , pl. 4, fig. 1, 2, pl. 5, fig. 2. Lobocarcinus sismondai – Ossó et al. 2022: 213 , 214, fig. 4a-c ( cum syn .). TYPE MATERIAL . — Cancer sismondai : holotype from the Pliocene of Santo Stefano Roero, Piedmont , Italy , figured by A. Sismonda (1839 : figs A, B), but lost during Second World War after Bonfiglio & Donadeo (1982) . Cancer deshayesii : syntype MNHN .F.B39264 ( Marès coll.) from the Pliocene of Alger , Algeria ; other syntypes ( Deshayes coll.) from the Messinian of Oran are housed in the collection of the Ecole des Mines de Paris deposited at the University Claude Bernard Lyon 1, France . EXAMINED MATERIAL . — 23 specimens from Les Planteurs quarry, Oran (MNHN.F.A51668, A51669, A51670, A51671, A51672, A51673, A51674, A51675, A51676, A51677, A51738, A51739, A51740, A51741, A41743, A41744, A41745, A41746, A41747, A51748, A51750, A51761, A51946, MNHN.F.R03507, R03537, Arambourg coll.). DISCUSSION A. Milne-Edwards(1864a) first described Cancer deshayesii based on a spectacular specimen from the Pliocene marls of Alger and other specimens (Deshayes coll.) from the Miocene of Oran . This species was later synonymized with Cancer sismondai Meyer, 1843 by Ristori (1886) . This synonymy and the placement in Lobocarcinus Reuss, 1857 , was discussed by several authors through the 20th century (e.g., Van Straelen 1937 ; Bonfiglio & Donadeo 1982 ) until Ossó et al. (2022) . All the Algerian specimens assigned to deshayesii or sismondai are currently in review by the authors and will be the subject of a future publication.