Dans ce travail nous avons discute´ et illustre´ les Loxoconchidae sauma^tres du Mioce`ne supe´rieur en Italie. Dans les bassins sauma^tres italiens on trouve trois genres et deux sous-genres : Loxoconcha, Loxocorniculina, Loxoconchissa (Loxoconchissa) et Loxoconchissa (Loxocaspia). En tenant compte des caracte`res diagnostiques des diffe´rents genres des Loxoconchidae, dans ce travail, Loxocorniculina est e´leve´e au rang ge´ne´rique, la mise en place de Loxocaspia comme sous-genre de Loxoconchissa est confirme´e et de nombreuses espe`ces nouvelles sont de´finies : Loxoconchissa (Loxoconchissa) kinoi nov. sp., Loxoconchissa (Loxocaspia) cosentinoi nov. sp., Loxoconchissa (Loxocaspia) nuda nov. sp., Loxoconchissa (Loxocaspia) punctata nov. sp., Loxoconchissa (Loxocaspia) reticulata nov. sp., Loxoconchissa (Loxocaspia) tuberosa nov. sp. et Loxoconchissa (Loxocaspia) velonae nov. sp. Loxocorniculina est un genre parate´thysien distribue´ dans toute la pale´o-Me´diterrane´e pendant l'e´ve´nement Lago-Mare du Messinien supe´rieur. Loxoconchissa s.l. a une distribution connue seulement dans le domaine parate´thysien et, dans ce travail, elle est signale´e pour la premie`re fois dans le Tortonien supe´rieur-Messinien infe´rieur en Italie. Nous avons donc discute´ la pale´obioge´ographie de ces genres et, en observant la distribution continue de Loxocorniculina et celle disjointe de Loxoconchissa, nous avons conclu que ce dernier genre a subi une dispersion passive gra^ce aux oiseaux aquatiques.
The LateMiocene Italian brackish Loxoconchidae are herein discussed and illustrated. Three genera and two subgenera have been recognized in the brackish Italian basins: Loxoconcha, Loxocorniculina, Loxoconchissa (Loxoconchissa) and Loxoconchissa (Loxocaspia). Taking into account the diagnostic characters of several Loxoconchidae genera, in this paper Loxocorniculina is raised at a generic rank, Loxocaspia is confirmed as a subgenus within genus Loxoconchissa and several new species are established: Loxoconchissa (Loxoconchissa) kinoi nov. sp., Loxoconchissa (Loxocaspia) cosentinoi nov. sp., Loxoconchissa (Loxocaspia) nuda nov. sp., Loxoconchissa (Loxocaspia) punctata nov. sp., Loxoconchissa (Loxocaspia) reticulata nov. sp., Loxoconchissa (Loxocaspia) tuberosa nov. sp. and Loxoconchissa (Loxocaspia) velonae nov. sp. Loxocorniculina is a typical Paratethyan genus which widespread into the Palaeo-Mediterranean during the late Messinian Lago-Mare event. Loxoconchissa was known to bewidespread only in the Paratethyan realm and in this paper it is signalled for the first time in the Late Tortonian-early Messinian of Italy. The palaeobiogeography of these genera is discussed and the observed continuous distribution of Loxocorniculina against the disjunct distribution of Loxoconchissa leads to suggest that this latter genus underwent a passive dispersal via aquatic birds. # 2007 Elsevier Masson SAS. All rights reserved.
Late Miocene brackish Loxoconchidae (Crustacea, Ostracoda) from Italy
2007
Abstract
The LateMiocene Italian brackish Loxoconchidae are herein discussed and illustrated. Three genera and two subgenera have been recognized in the brackish Italian basins: Loxoconcha, Loxocorniculina, Loxoconchissa (Loxoconchissa) and Loxoconchissa (Loxocaspia). Taking into account the diagnostic characters of several Loxoconchidae genera, in this paper Loxocorniculina is raised at a generic rank, Loxocaspia is confirmed as a subgenus within genus Loxoconchissa and several new species are established: Loxoconchissa (Loxoconchissa) kinoi nov. sp., Loxoconchissa (Loxocaspia) cosentinoi nov. sp., Loxoconchissa (Loxocaspia) nuda nov. sp., Loxoconchissa (Loxocaspia) punctata nov. sp., Loxoconchissa (Loxocaspia) reticulata nov. sp., Loxoconchissa (Loxocaspia) tuberosa nov. sp. and Loxoconchissa (Loxocaspia) velonae nov. sp. Loxocorniculina is a typical Paratethyan genus which widespread into the Palaeo-Mediterranean during the late Messinian Lago-Mare event. Loxoconchissa was known to bewidespread only in the Paratethyan realm and in this paper it is signalled for the first time in the Late Tortonian-early Messinian of Italy. The palaeobiogeography of these genera is discussed and the observed continuous distribution of Loxocorniculina against the disjunct distribution of Loxoconchissa leads to suggest that this latter genus underwent a passive dispersal via aquatic birds. # 2007 Elsevier Masson SAS. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
