Late Maastrichtian and earliest Danian scaphitid ammonites from central Europe: Taxonomy, evolution and extinction

Late Maastrichtian and earliest Danian scaphitid ammonites from key sections in the Maastricht area in the Netherlands and Belgium, Hemmoor in Germany, Stevns Klint (Sjælland) and Jylland in Denmark, the Lublin Upland in Poland and Lviv in the Ukraine, are studied. In total, thirteen scaphitid taxa are recognised: Hoploscaphites constrictus lvivensis subsp. nov., H. c. crassus, H. c. johnjagti subsp. nov., H. tenuistriatus, H. pungens, H. schmidi, H. sp. ex gr. pungens–schmidi, H. felderi, H. sp. ex gr. waagei–angmartussutensis, Acanthoscaphites (Euroscaphites) varians varians, A. (E.) varians blaszkiewiczi, A. (E.?) verneuilianus and A. (E.?) sp. aff. verneuilianus. Sexual dimorphism is demonstrated for several species. Addition− ally, developmental polymorphism of males is proposed to explain a size−dependent variation of ornament in microconchs of H. c. crassus. The extinction pattern of European scaphitids is difficult to assess for methodological reasons. The avail− able data indicate, however, that the Hoploscaphites constrictus lineage survived unaffected until the very end of the Creta− ceous and even crossed the Cretaceous–Paleogene (K–Pg) boundary. The latest Maastrichtian populations of this lineage, assigned to H. c. johnjagti subsp. nov., are dominated by individuals with pronounced ribbing and tuberculation of the body chamber. This may reflect increased predation pressure, indirectly related to the late Maastrichtian regression. The succes− sive members of the Hoploscaphites constrictus lineage, i.e., Hoploscaphites constrictus lvivensis subsp. nov., H. c. crassus, and H. c. johnjagti subsp. nov. are useful for subdivision of upper Maastrichtian deposits.

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