Results 31 to 40 of about 383 (157)
Papers in Palaeontology, Volume 7, Issue 4, Page 2113-2139, November 2021., 2021 Abstract The systematics of ammonoids are complicated by their large degree of intraspecies variation, which complicates a stable validation of species. Aegocrioceras is a heteromorph ammonite from the Lower Saxony Basin in the Hauterivian Boreal, and a prime example of a genus with an unstable internal systematic and external relationship to other ...
Manuel F. G. Weinkauf +3 more
wiley +1 more source
Taxonomy and Phylogeny of Fossil Coleoidea [=Dibranchiata]
, 1965 J A Jeletzky
openaire +2 more sources
Ups and downs of belemnite diversity in the Early Jurassic of Western Tethys
Palaeontology, Volume 64, Issue 2, Page 263-283, March 2021., 2021 Abstract Although belemnites form a major clade of extinct cephalopods, the early stage of their diversification remains poorly known in time and space. Here we investigate the first diversification episodes of belemnites (order Belemnitida) using a new species‐level database encompassing the Hettangian–Aalenian interval (Early Jurassic – earliest ...
Pascal Neige +3 more
wiley +1 more source
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
doaj +1 more source
The geography of body size in cuttlefishes (Cephalopoda, Sepiidae)
Swiss Journal of Palaeontology, 2021 This study explores body size in sepiids (Cephalopoda, Sepiidae) on the interspecific scale and provides an overview of their geographical distribution. Results reveal a highly skewed distribution of body size variation for raw values and a nearly normal
Pascal Neige
doaj +1 more source
, 2023 Supplemental material, sj-pdf-1-vet-10.1177_03009858231186306 for A retrospective study of pathologic findings in cephalopods (extant subclasses: Coleoidea and Nautiloidea) under laboratory and aquarium management by Andrew F.
Andrew F. Rich (9602390) +3 more
core +1 more source
Hettangian, Early Jurassic coleoids from West Somerset, SW England—filling a gap in the coleoid record of NW Europe [PDF]
Acta Palaeontologica PolonicaThe semi-articulated remains of two specimens of the putative diplobelid coleoid species of Clarkeiteuthis and a coleoid of uncertain affinity (possibly a phragmoteuthid) are described from a single bed in the Blue Lias Formation (early Hettangian ...
DAVID H. EVANS +3 more
doaj +1 more source
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
doaj +1 more source
Intraspecific variation and new morphological characters revealed by multimodal imaging analysis on the Late Cretaceous coleoid Dorateuthis syriaca [PDF]
Acta Palaeontologica PolonicaThe Cretaceous outcrops of Haqel, Hjoula (Cenomanian) and Sahel Aalma (Santonian) in Lebanon are renowned for their exceptional preservation of coleoid soft tissue in coeval shallow carbonate mud deposits and provide an unmatched opportunity to study ...
Alison J. Rowe +11 more
doaj +1 more source
Swiss Journal of Palaeontology, 2021 A newly collected specimen of the enigmatic coleoid genus Longibelus is recorded from lower Turonian strata along the River Shadrinka in Sakhalin (Russian Far East). To date, this is the first record of Late Cretaceous coleoid cephalopods from the island
Elena A. Jagt-Yazykova +2 more
doaj +1 more source