The organic-walled dinoflagellate cyst Mendicodinium mataschenensis is introduced here as a new species. The taxon derives from lower Tortonian clays from the Mataschen clay pit in Styria, Austria. These deposits formed in Lake Pannon, which was characterized throughout the Late Miocene by its highly endemic and rapidly evolving biota. As most species of Mendicodinium are known from restricted marine and brackish paleoenvironments, its occurrence in Lake Pannon may be considered further evidence for the brackish water conditions prevailing in this lake.

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