Gastropods of an Ottnangian (Early Miocene) rocky shore in the North Alpine Foreland Basin (Allerding, Austria)

We describe the first shallow marine and hard-ground associated gastropod assemblage from the Ottnangian (Early Miocene) of the Central Paratethys Sea. In many cases, the poor and usually fragmentary preservation as casts and moulds does not allow a definitive identification. Nevertheless, the small assemblage – comprising 32 species-level taxa – suggests a hitherto unknown faunal association with a high percentage of endemism. About 60 % of species are new to science or at leastuntil now unknown from the Paratethys Sea. Temporal outcrops at the Schärdinger Granit Industrie AG quarry at Allerding (Upper Austria) exposed the former coastal granite boulders of the Bohemian Massif, which were settled by several patelliform gastropod species of different families, along with the trochids and turbinids. These hardgrounds harboured also demosponges and cnidarians, which are indicated by the diversity of epitoniids and the frequency of siliquariids. Cellana? danningeri Harzhauser & Landau nov. sp., Bolma paratethyca Harzhauser & Landau nov. sp. and Claviscala norica Harzhauser & Landau nov. sp. are described as new species. In addition, nine species are probably new but are described in open nomenclature due to the insufficient preservation.