C. BESCHIN, A. BUSULINI, G. TESSIER

    0
    75

    Crostacei medio-eocenici della “Pietra di Nanto” (Monti Berici, Vicenza – Italia settentrionale)

    Riassunto

    Viene descritta una nuova fauna di decapodi fossili rinvenuta a Nanto (Vicenza) in livelli dell’Eocene medio (Luteziano); è costituita dalla nuova specie di Axiidea Ctenocheles fabianii sp. nov. (Ctenochelidae) e da undici specie di Brachyura delle quali cinque nuove: tre sono riferite ai Raninidae [Bonizzatoides tuberculatus gen. nov., sp. nov., Notopoides nantoensis sp. nov., Raninoides ombonii (Fabiani, 1910)], due ai Calappidae (Calappilia minuta sp. nov., Nantocyclois eocenicus gen. nov., sp. nov.), due agli Zanthopsidae [Harpactocarcinus punctulatus (Desmarest, 1822) e H. macrodactylus A. Milne Edwards, 1862], una ai Goneplacidae [Magyarcarcinus loczyanus (Lörenthey, 1898)], una ai Portunidae (Portunus sp.) e due ai Panopeidae (Palaeograpsus inflatus Bittner, 1875 e Panopeus bericus sp. nov.). Vengono istituiti due nuovi generi: Bonizzatoides gen. nov. per un Raninoidinae con fronte ampia tricuspidata e piccolo dente sovraorbitale infossato e Nantocyclois gen. nov. per un Calappidae con forti denti postero-laterali, margine posteriore con tre spine cilindriche e lobo mediano posteriore sporgente circondato da sei tubercoli.

    Abstract

    Middle Eocene crustaceans from the “Pietra di Nanto”(Berici Mounts, Vicenza – Northern Italy)

    A new decapod fauna has been discovered from the Eocene levels cropping out at Nanto (Vicenza). It includes the new Axiidea Ctenocheles fabianii sp. nov. (Ctenochelidae) and eleven Brachyura species five of which are new. Three species belong to the Raninidae [Bonizzatoides tuberculatus gen. nov., sp. nov., Notopoides nantoensis sp. nov., Raninoides ombonii (Fabiani, 1910)], two to the Calappidae (Calappilia minuta sp. nov. and Nantocyclois eocenicus gen. nov., sp. nov. ), two to the Zanthopsidae [Harpactocarcinus punctulatus (Desmarest, 1822) and H. macrodactylus A. Milne Edwards, 1862], one to the Goneplacidae [Magyarcarcinus loczyanus (Lörenthey, 1898)], one to the Portunidae (Portunus sp.) and two to the Panopeidae (Palaeograpsus inflatus Bittner, 1875 and Panopeus bericus sp. nov.). The status of some species of fossil Raninoidinae found in Veneto (NE Italy) is discussed and a new genus is described within this subfamily: Bonizzatoides gen. nov. is characterized by a wide rostrum with three well developed triangular teeth, by a small triangular enclosed upper orbital tooth and a pointed outer orbital tooth. A new genus is described within the Calappidae: Nantocyclois gen. nov. has a granular surface with low and smooth small swellings, three triangular very developed and protruding posterolateral spines, posterior margin with three subcylindrical very protruding spines, joined cardiac and intestinal regions forming a lobe projecting from the posterior margin and surrounded by six small round tubercles. The status of Harpactocarcinus macrodactylus is analyzed and discussed.