The ammonoids from the Gattendorfia Limestone of Gattendorf (Devonian-Carboniferous boundary; Upper Franconia, Germany) 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 Weyer, Dieter A09A1738-C70E-4F22-A069-8B7DB4A1753D Museum für Naturkunde, Leibniz-Institut für Evolutions-und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.weyer@t-online.de text European Journal of Taxonomy 2023 2023-07-20 883 1 61 http://dx.doi.org/10.5852/ejt.2023.883.2179 journal article 58041 10.5852/ejt.2023.883.2179 083bbc7e-6bad-40b9-b396-ae1abcb7b541 2118-9773 8177861 73950341-F6C4-43BA-9789-179484A82FB9
Table 15. Conch ontogeny of Acutimitoceras acutum (Schindewolf, 1923) from Gattendorf und Saalfeld.
dmconch shapewhorl cross section shapewhorl expansion
2 mmthickly discoidal; subevolute (ww/dm ~ 0.58; uw/dm ~ 0.40)moderately depressed; strongly embracing (ww/wh ~ 1.75; IZR ~ 0.40)low (WER ~ 1.55)
5 mmthickly discoidal; subinvolute (ww/dm ~ 0.55; uw/dm ~ 0.20)weakly depressed; very strongly embracing (ww/wh ~ 1.25; IZR ~ 0.45)low (WER ~ 1.70)
15 mmthinly discoidal; involute (ww/dm ~ 0.40; uw/dm ~ 0.08)weakly compressed; very strongly embracing (ww/wh ~ 0.65; IZR ~ 0.45)high (WER ~ 2.05)
30 mmextremely discoidal; involute (ww/dm ~ 0.30; uw/dm ~ 0.00)weakly compressed; very strongly embracing (ww/wh ~ 0.55; IZR ~ 0.45)high (WER ~ 2.20)