Results 21 to 30 of about 156 (98)
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
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
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
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, 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
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
The palaeobiology of belemnites – foundation for the interpretation of rostrum geochemistry
Biological Reviews, Volume 95, Issue 1, Page 94-123, February 2020., 2020 ABSTRACT Belemnites are an extinct group of Mesozoic coleoid cephalopods with a fossil record ranging from the early Late Triassic [about 240 million years ago (Mya)] to the Cretaceous/Palaeogene boundary (65 Mya). Belemnites were widely distributed, highly abundant and diverse, and an important component of Mesozoic marine food webs.
René Hoffmann, Kevin Stevens
wiley +1 more source
An Early Triassic gladius associated with soft tissue remains from Idaho, USA—a squid-like coleoid cephalopod at the onset of Mesozoic Era [PDF]
Acta Palaeontologica Polonica, 2018 We describe an Olenekian (Early Triassic) “fossil squid” belonging to the oldest complex Mesozoic marine biota collected in the Lower Shale unit of the Lower Triassic Thaynes Group in Idaho, USA. The studied specimen shows a tapered structure embedded in
Larisa A. Doguzhaeva +9 more
doaj +1 more source
Relationship of Cephalopods Orders Based on Morphological Characters
Jurnal Kelautan Tropis, 2022 Biodiversity is vital in our daily life. As a maritime country, Indonesian waters harbor many valuable animals such as Cephalopoda. Indonesian waters are rich in various species of cephalopods. Several previous studies on Indonesian cephalopods have been
Nova Mujiono, Putri Sapira Ibrahim
doaj +1 more source
Papéis Avulsos de Zoologia, 2011 Cefalópodes coleóides (lulas, sépias e polvos) produzem espermatóforos muito complexos que são transferidos à fêmea durante a cópula por meio do hectocótilo, um apêndice modificado nos machos.
José Eduardo Amoroso Rodriguez Marian
doaj +1 more source