Abstract
The systematic study of bivalves collected from the Cenomanian-Turonian succession of the Bellezma-Batna Mountains (northeastern Algeria) led identification of nine species belonging to eight genera, three of which, Nicaisolopha nicaisei (Coquand), Pterotrigonia (Scabrotrigonia) scabra (Lamarck), and Agelasina plenodonta Riedel, were recorded for the first time from the study area. Particular attention was paid to the rudist fauna, including Vaccinites praegiganteus (Toucas), Vaccinites rousseli (Douvillé), and Sauvagesia nicaisei (Coquand), occurring in very large numbers within composite biostromes (5 to 10 m-thick) composed of both hippuritids and radiolitids. A distribution map of Cenomanian-Turonian bivalves is established based on data from Algeria and other localities.The map shows that the most bivalve genera are widely distributed and some of them are probably cosmopolitan. They are present in northern Africa, Middle East, south and northern Europe, western Africa, and South America, with some taxa are also known from the south-eastern coast of Africa (Madagascar and South Africa) and India.
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