The Cenozoic Plesiotritoninae (Mollusca: Neogastropoda: Cancellarioidea: Cancellariidae) of the Aquitaine Basin, Southwestern France. (original) (raw)

Abstract

The Tertiary species belonging to the subfamily Plesiotritoninae (Cancellariidae) now known from the region of Aquitaine Basin, southwestern France, are studied. The geological and geographical settings of the sites involved are specified. Apart from Loxotaphrus thorei (GRATELOUP, 1845), seven species are here described as new to science: Plesiotriton aucoini, Early Oligocene (Late Rupelian) of Espibos, Gaas (Landes); P. camiadeorum, Early Oligocene (Late Rupelian) of Lagouarde, Gaas (Landes); P. ganensis and P. teuleraensis, both from Early Eocene (Late Ypresian, Cuisian) of La Teulere, Gan (Pyrénées-Atlantiques); Tritonoharpa aquitaniensis, Early Miocene (Early Burdigalian), Vives quarry, Meilhan (Landes); T. mariechristinae, Middle Miocene (Langhian) of Gélis quarry, Le Houga (Gers); T. renardi, Middle Miocene (Serravallian) of Carré or historically Carrey, Sallespisse (Pyrénées-Atlantiques). Triton speciosum BELLARDI, 1873, is here placed in Tritonoharpa; for Triton praetextum BELLARDI, 1873, no position could be taken by lack of good material. The species introduced under the name Tritonidea (Cantharus) aturensis (PEYROT, 1927) is here considered an ecomorph of the very variable Loxotaphrus thorei (GRATELOUP, 1845), next to L. thorei morph thorei, L. thorei morph estotiensis, and L. thorei morph laevis. Loxotaphrus abnormis (BAYAN, 1870) is considered different from L. thorei, but Loxotaphrus subtaurinensis (VERGNEAU, 1965) is considered as synonym of L. thorei. The new genus Beuella (Cancellariidae: Plesiotritoninae) is proposed for Tritonidea pisanelloides COSSMANN in O’GORMAN & COSSMANN, 1923 of the Cuisian of Gan (Pyrénées-Atlantiques).

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