Stratigraphic positions of European specimens of Megalolamna according to their country of discovery described in this paper.

Tooth of Megalolamna serotinus comb. nov. (GPIT-PV-31738) from the Upper Marine Molasse Baltringen, Walbertsweiler, Baden-Württemberg, Germany, that was originally described as Otodus serotinus by Probst (1879, pl. 2, fig. 84). (A) lingual, (B) profile, and (C) labial views. Scale bar: 5 mm.

Additional teeth of Megalolamna serotinus comb. nov. from Miocene deposits of Europe described in this paper. A: SNSB-BSPG 1984 X 21 from the Upper Marine Molasse Baltringen, Walbertsweiler, Baden-Württemberg, Germany, in lingual view; B–E: Oberösterreichische Landes-Kultur GmbH Coll. no. 2022/46 from the Upper Marine Molasse, Plesching, Austria, in (B) lingual, (C) labial, (D) profile, and (E) basal views; F–K: Museo Civico di Storia Naturale di Milano Coll. no. V5858 and 5856 from the lower part of the “Pietra da canton” formation, Monferrato region, Italy, in (F, I) lingual, (G, J) profile, and (H, K) labial views; L–Q: Three teeth from Pietra da Cantoni, eastern Monferrato, Italy, the collection of the Earth Sciences Department of the University of Turin: MGPT uncat. in (L) lingual and (M) labial views; MGPT-PU 11196 in (N) lingual and (O) labial views; and MGPT uncat. in (P) lingual and (Q) labial views; R–U: UM MAZ 38 from Mazan, Mormoiron Basin, Vaucluse, France, in (R) lingual, (S) profile, (T) labial, and (U) basal views. Scale bar: 10 mm.

Geographic distribution of previous records (circle) and newly described European records (star) of Megalolamna (Carrillo-Briceño et al. 2016, 2020; Shimada et al. 2017, in press) using early Miocene (Aquitanian–Burdigalian) paleogeographic map (after Smith et al. 1994, p. 27).