Clavagellacea (Bivalvia) from the Tertiary of the Venetian region, NE Italy

Abstract

The clavagellacean bivalves from the Tertiary of the Venetlian region (NE Italy) are revised and some relevant marphological-descriptive terms are discussed, the term crypt being proposed to indicate the whole externaI construction of these tube-dwelling bivalves (burrow or borehole, calcareous lining, adventitious envelope, shell fused to the envelope). Two new species are described: Clavagella (Stirpulina) veronensis sp. n. from the Middle Eocene of the Verona province, and C. (S.) vicentina sp. n. from the Lower Oligocene of the Vicenza province.