Abstract
Thirteen taxa of the species group undescribed up to now in Bulgaria are described in this paper. They belong to 9 genera and 9 families of Archaeogastropoda and Mesogastropoda orders. The species were found in outcrops exposed along the right bank of Vit River to the west of the town of Pleven between the villages of Târnene and Bivolare. Only Late Moravian (foraminiferal zone Orbulina suturalis) and Wielichkian (foraminiferal zone Uvigerina) sediments of the Badenian regional stage are exposed in this area. Despite its diversity and facial characteristics, the gastropoda fauna is not stratigraphically tied and therefore does not appear as an indication for the Early Badenian age of these deposits. The similarity of most taxa with those from the Vienna Basin is an evidence of parallelism of their development.
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