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Papers in Palaeontology, Volume 7, Issue 3, Page 1435-1457, August 2021., 2021 Abstract The ammonoid genus Arctoceras (Hyatt) occurs across all palaeolatitudes, and is a key genus for middle Smithian biostratigraphical correlations globally. In this study, intraspecific variations in conch morphology, ornamentation and allometry are examined in relation to stratigraphic position.
Bitten B. Hansen +4 more
wiley +1 more source
Recent advances in heteromorph ammonoid palaeobiology
Biological Reviews, Volume 96, Issue 2, Page 576-610, April 2021., 2021 ABSTRACT Heteromorphs are ammonoids forming a conch with detached whorls (open coiling) or non‐planispiral coiling. Such aberrant forms appeared convergently four times within this extinct group of cephalopods. Since Wiedmann's seminal paper in this journal, the palaeobiology of heteromorphs has advanced substantially.
René Hoffmann +9 more
wiley +1 more source
Early Cretaceous ammonites and dinoflagellates from the Western Tatra Mountains, Poland [PDF]
Acta Palaeontologica Polonica, 2020 The first Early Cretaceous (Valanginian–Hauterivian) ammonite fauna from the lower part of the Kościeliska Marl Formation (Wściekły Żleb Member) of the Lower Sub-Tatric (Krížna) Nappe, in the Lejowa Valley of the Tatra Mountains are described.
Zdeněk Vašíček +6 more
doaj +1 more source
ARCTIC AND SUBARCTIC NATURAL RESOURCESFor the first time, shell cross-sections were made for the most ancient (Late Permian) representatives of the genus Otoceras. From these cross-sections, ontogenetic changes in the shell shape of O. concavum Tozer were reconstructed at size stages ranging
Р. В. Кутыгин, A. N. Kilyasov
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Acta Palaeontologica Polonica, 2023 Fossils of Devonian ammonoids are abundant and well-preserved in the Anti-Atlas of Morocco; as such they provide an invaluable record of regional morphological disparity changes (diversity of shapes) that characterise the first steps of ammonoid ...
NINON ALLAIRE +6 more
doaj +1 more source
Foldtani KozlonyHere the distribution of criocone members of the family Leptoceratoididae that proliferated during the early and late Barremian is investigated. We attempted to identify environmental factors that may have influenced the abundance, diversity and ...
Gergő Gőgös, Ottilia Szives
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Lower Cretaceous (Hauterivian-Albian) ammonite biostratigraphy in the Maestrat Basin (E Spain) [PDF]
, 2014 Peer reviewedPublisher ...
Bover-Arnal, T. +11 more
core +4 more sources
Acta Palaeontologica Polonica, 2023 The rare Middle Jurassic ammonite Oecoptychius refractus is revisited based on material collected in southern Poland (Ogrodzieniec quarry) and France (St.-Laon near Loudun, western France). Based on available data and an evaluation of the literature, O.
SREEPAT JAIN +3 more
doaj +1 more source
MIDDLE TRIASSIC (ANISIAN) CEPHALOPODS FROM THE MECSEK MOUNTAINS, HUNGARY
Rivista Italiana di Paleontologia e Stratigrafia, 2022 Recent nautiloid and ammonoid finds from the Middle Triassic Zuhánya Limestone Formation in the Mecsek Mountains (south Hungary) proved that the formation encompasses the whole Pelsonian and the lower Illyrian substages of the Anisian Stage.
ATTILA VÖRÖS +2 more
doaj +2 more sources