25 years ago, a diverse vertebrate assemblage was discovered at the famous Santonian (Upper Cretaceous) Iharkút fossil locality (Bakony Mts, western Hungary). Fishes, among them members of the order Pycnodontiformes have been important components of this continental ecosystem. Members of the order Pycnodontiformes have previously been reported from the Iharkút location by remains referred to as cf. Coelodus sp. Revision of the already published material and the elaboration of recently collected specimens have led to identification of a new pycnodontid species Polazzodus mihalyfii sp. nov., based on upper and lower jaw elements. The new species expands the geographical range of the genus Polazzodus, and largely contributes to our knowledge on the generic diversity of Late Cretaceous freshwater pycnodonts.

Key words: Pycnodontiformes, Pycnodontidae, Polazzodus , Santonian, Cretaceous, Iharkút, Hungary.

Márton Szabó [szabo.marton@nhmus.hu, martonszabo@staff.elte.hu, szabo.marton.pisces@gmail.com; ORCID: https:// orcid.org/0000-0002-3233-7797], Hungarian National Museum Public Collection Centre – Hungarian Natural History Museum, Department of Palaeontology and Geology, H-1083 Budapest, Ludovika tér. 2, Hungary; ELTE Eötvös Loránd University, Institute of Geography and Earth Sciences, Department of Palaeontology, H-1117 Budapest, Pázmány Péter sétány 1/C, Hungary. John J. Cawley [johnjosephcawley@gmail.com; ORCID: https://orcid.org/0000-0002-3703-4138], Department of Palaeontology, University of Vienna, Josef-Holaubek-Platz 2, 1090 Vienna, Austria.