About the stratigraphic position of the Lower Aptian Roloboceras hambrovi (Ammonoidea) level
Carnets de Géologie, 2008 In the stratotype of the Lower Aptian substage the position of the assemblage that includes Roloboceras spp. and Megatyloceras spp. has been clearly established as being in the middle part of the upper Bedoulian. Some authors have erected this horizon as
Conte Gabriel +3 more
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VILLANIA'NIN (AMMONOIDEA) TÜRKİYE'DEKİ VARLIĞI HAKKINDA
Bulletin of the Mineral Research and Exploration, 1982 Türkiye'deki varlığı ilk kez saptanan Villania bugüne değin Macaristan'a özgü bilinen bir ammonit cinsidir. Bilecik yöresinde bulunan iki örnek, Villania cf.
Füsun ALKAYA
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NEW EARLY BATHONIAN BIGOTITINAE AND ZIGZAGICERATINAE (AMMONOIDEA, MIDDLE JURASSIC)
Rivista Italiana di Paleontologia e Stratigrafia, 2007 Several tens of Lower Bathonian Bigotites from Digne-Castellane region (SE France) and Cabo Mondego area (Portugal) have been reviewed. Three species have been distinguished in the lowermost subzone of the Zigzag Zone (Parvum Subzone) just above the ...
SIXTO R. FERNÁNDEZ-LÓPEZ +3 more
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The dorsal shell wall structure of Mesozoic ammonoids [PDF]
Acta Palaeontologica Polonica, 2017 The study of pristine preserved shells of Mesozoic Ammonoidea shows different types of construction and formation of the dorsal shell wall. We observe three major types: (i) The vast majority of Ammonoidea, usually planispirally coiled, has a prismatic ...
Gregor Radtke, Helmut Keupp
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Conellae, enigmatic structures on cephalopod shells—shapes, distribution, and formation [PDF]
Acta Palaeontologica Polonica, 2019 Conellae, enigmatic cone-shaped structures which can be found on the surface of internal moulds of cephalopod shells (predominantly of ammonoids), are regarded herein as the product of remote (biologically induced) biomineralization formed in closed-off ...
René Hoffmann +2 more
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Evolutionary development of the cephalopod arm armature: a review [PDF]
Swiss Journal of Palaeontology, 2021 The cephalopod arm armature is certainly one of the most important morphological innovations responsible for the evolutionary success of the Cephalopoda.
Dirk Fuchs +2 more
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Cephalopod palaeobiology: evolution and life history of the most intelligent invertebrates [PDF]
Swiss Journal of Palaeontology, 2022 Sigurd von Boletzky was a cephalopod researcher who was world-renowned for his enthusiasm for his field of research, for his friendly and calm personality, and, of course, his publications.
Christian Klug +6 more
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Another lesson from beautiful monsters: the case of 'sex reversals' in the Ammonoidea and their significance [PDF]
BMC Ecology and Evolution, 2021 Background Expression of sexual dimorphism is recognised in various fossil groups of molluscs such as the Ammonoidea, an extinct group of shelled cephalopods.
Camille Frau, Pierre-Yves Boursicot
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Failed prey or peculiar necrolysis? Isolated ammonite soft body from the Late Jurassic of Eichstätt (Germany) with complete digestive tract and male reproductive organs [PDF]
Swiss Journal of Palaeontology, 2021 Ammonoid soft parts have been rarely described. Here, we document the soft parts of a perisphinctid ammonite from the early Tithonian of Wintershof near Eichstätt (Germany). This exceptional preservation was enabled by the special depositional conditions
Christian Klug +3 more
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First record of non-mineralized cephalopod jaws and arm hooks from the latest Cretaceous of Eurytania, Greece [PDF]
Swiss Journal of Palaeontology, 2020 Due to the lower fossilization potential of chitin, non-mineralized cephalopod jaws and arm hooks are much more rarely preserved as fossils than the calcitic lower jaws of ammonites or the calcitized jaw apparatuses of nautilids. Here, we report such non-
Christian Klug +3 more
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