Marine shelled Heterobranchia in part (Gastropoda) of the Miocene Central Paratethys Sea

We present a revision of the Early and Middle Miocene marine heterobranchs from the European Central Paratethys Sea. We document a surprisingly high diversity of 83 species of which 32 species are described as new species. As shown by many other gastropod families, discussed in previous papers of this series, maximum diversity occurred during the middle Badenian, 65 species, corresponding to the Miocene Climatic Optimum. The extant Indo-West Pacific genus Vellicolla Oskars, Too, rees, Mikkelsen, Willassen & Malaquias, 2019is recorded for the first time from the Miocene of the Circum-Mediterranean region.Following species are described as new: Acteon antipinguissp. nov., Acteon guttasp. nov., Acteon romanicussp. nov., Acteon trifasciatussp. nov., Acteon vicianisp. nov., Acteon vindobonensissp. nov., Rictaxis austriacussp. nov.,Rictaxis siedlisp. nov., Rictaxis ursulaesp. nov. (Acteonidae), Ringicula daisyaesp. nov. (ringiculidae), Bulla? elalbaniisp. nov. (Bullidae), Pyrunculus microromanicussp. nov., Pyrunculus szobiensissp. nov., Pyrunculus zuschinisp. nov.,Retusa mysticasp. nov. (retusidae),Cylichna caudexsp. nov., Cylichna doliumsp. nov., Cylichna eschneraesp. nov.,Cylichna miosimplexsp. nov., Cylichna steiningerisp. nov., Cylichna straussisp. nov. (Cylichnidae), Chelidonura piseraiisp. nov. (Aglajidae), Roxania oviformissp. nov., Roxania pilasp. nov. (Alacuppidae), Sabatia quasimodoisp. nov., Scaphander alatissimussp. nov., Scaphander catenasp. nov., Scaphander perforatussp. nov., Scaphander quadratussp. nov., Scaphander schollnbergerisp. nov. (Scaphandridae), and Pseudavena bellasp. nov. (incertae sedis).Acrostemma anatolicasp. nov. (Cylichnidae) is described from the Middle Miocene of Turkey. Neubaueriella nov. gen.(haminoeidae) is introduced as new genus. Roxania bomba nov. nom. is introduced as new name for the secondary homonym Roxania helvetica (Berger, 1949) non Roxania helvetica Peyrot, 1932

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