Pliocene gastropod faunas from Kallo (Oost-Vlaanderen, Belgium) — Part 1. Introduction and Archaeogastropoda

Archaeogastropods from Pliocene strata exposed at Kallo, province of Oost-Vlaanderen (Belgium) are revised, and their stratigraphical and geographical occurrence discussed. Six taxa have not been described previously from the Pliocene of Belgium, viz. Emarginula rosea Bell, 1824, E. crassa crassalta Wood, 1874, Calliostoma (C.) aff. noduliferens (Wood, 1872), Gibbula (Colliculus) crassistriata (Bell in Wood, 1882), Skenea (Lissospira) basistriata (Jeffreys, 1877) and Dikoleps pusilla (Jeffreys, 1847). Calliostoma (C.) kickxii (Nyst, 1835) is considered distinct from Calliostoma (C.) zizyphinum (Linné, 1758). Gibbula (Colliculus) petala is described as new. Sections of the Kallo (temporary) exposures and their geographical setting are described in detail and discussed.