Nouvelles données sur les macro-invertébrés du Turonien de la région de Libreville (bassin côtier nord-gabonais)

Thirteen species of macroinvertabrates have been identified for the first time from the Turonian deposits of the Libreville region. Seven ones correspond to bivalves: Lima (Plagiostoma) subsimplex Thomas and Péron, 1890, ?Osteomya sp., Plicatula ferryi Coquand, 1862, P. fourneli Coquand, 1862, P. ventilabrum var. suffetulensis Pervinquière, 1912, Plicatula sp., Pleuromya sp.; three other ones are echinoid species: Mecaster batnensis (Coquand, 1862), Mecaster nicaisei (Coquand, 1862), Mecaster sp.; and the last three are gastropods: Cylichna sp. ? Pterocerella poinsettiformis Stephenson, 1941, Columbellina sp. Excepted Plicatula ferryi Coquand and P. ventilabrum var. suffetulensis Pervinquière which are identified in the Senonian of Gabon, all species are found for the first time in Gabonese coastal basin. Their paleobiogeographic distribution is extended to Gabon. In Gabonese coastal basin, the stratigraphic and geographic ranges of the Plicatula genus are extended in Turonian and Libreville region respectively. The macrofaunal assemblage found in the Libreville region is cosmopolitan. Its shows paleogeographical affinities with Tethys and south of South Atlantic.