The early gephuroceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea) Author Korn, Dieter 286CA4F3-7EBC-4AEF-A66A-B2508D001367 Museum für Naturkunde, Leibniz-Institut für Evolutions-und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin Author Bockwinkel, Jürgen F7FE7EEA-B678-4FEE-879C-8C429F66BF3A Dechant-Fein-Strasse 22, 51375 Leverkusen, Germany. jbockwinkel@t-online.de text European Journal of Taxonomy 2022 2022-06-08 823 10 47 http://zoobank.org/d5ac626b-4a10-4cd9-b77b-6d7efe8d180e journal article 68733 10.5852/ejt.2022.823.1811 5cb7c978-e62d-4576-b32d-2469745af89a 2118-9773 6628057 D5AC626B-4A10-4CD9-B77B-6D7EFE8D180E Family Acanthoclymeniidae Schindewolf, 1955 Diagnosis Family of the superfamily Beloceratoidea with sutural formula (E 2 E 1 E 2 ) L U: I; lateral saddle narrow, narrowly rounded to subacute; lateral lobe simple, rounded. Included genera Acanthoclymenia Hyatt, 1900 ; Prochorites Clausen, 1969 ; Eidoprobeloceras Kirchgasser, 1968 (nomen nudum; synonym of Prochorites ); Probeloceras Clarke, 1899 .