Abstract: Three previously unknown octopods are described from Upper Cenomanian limestones of the Hâqel and Hâdjoula localities (Lebanon). Keuppia levante gen. nov., sp. hyperbolaris nov,. nov. Styletoctopus annae nov, . regarded as earliest representatives Octopoda (= Incirrata). This assumption is mainly based on their medially isolated bipartite gladius vestige. As can be inferred growth increments, distinguished genus Palaeoctopus by blades that grow forwards along longitudinal axis. The...

Body-size reduction is considered an important response to current climate warming and has been observed during past biotic crises, including the Pliensbachian–Toarcian crisis, a second-order mass extinction. However, in fossil cephalopod studies, mechanisms their potential link with are rarely investigated palaeobiological scales of organization not usually differentiated. Here, we hypothesize that belemnites reduce adult size across boundary event. Belemnite body-size dynamics Peniche...

Teleosauroids were a clade of semi-marine crocodylomorphs that attained near-global distribution during the Jurassic Period. They particularly common Toarcian (Early Jurassic) and are well documented throughout UK Germany. However, teleosauroids discovered in Luxembourg have been little studied rarely discussed scientific literature. Here we present comprehensive catalogue thalattosuchian specimens, including nine (all from Toarcian) five Thalattosuchia indeterminate (four one Bajocian),...

Even though a handful of long-lived reptilian clades dominated Mesozoic marine ecosystems, several biotic turnovers drastically changed the taxonomic composition these communities. A seemingly slow paced, within-geological period turnover took place across Early–Middle Jurassic transition. This saw demise early neoichthyosaurians, rhomaleosaurid plesiosaurians and plesiosauroids in favour ophthalmosaurid ichthyosaurians cryptoclidid pliosaurid plesiosaurians, that will dominate Late and, for...

Early Jurassic belemnites are of particular interest to the study evolution skeletal morphology in Lower Carboniferous uppermost Cretaceous belemnoids, because they signal beginning a global Jurassic-Cretaceous expansion and diversification belemnitids.We investigated potentially relevant, this evolutionary pattern, shell features Sinemurian-Bajocian Nannobelus, Parapassaloteuthis, Holcobelus Pachybelemnopsis from Paris Basin.Our analysis morphological, ultrastructural chemical traits...

Especially in Lagerstätten with exceptionally preserved fossils, we can sometimes recognize fossilized remains of meals animals. We suggest the term leftover fall for event and pabulite meal when it never entered digestive tract (difference to regurgitalites). Usually, pabulites are incomplete organismal show traces predation. Pabulites have a great potential inform about predation as well anatomical detail, which is invisible otherwise. Here, document comprising belemnite Passaloteuthis...

Abstract Although belemnites form a major clade of extinct cephalopods, the early stage their diversification remains poorly known in time and space. Here we investigate first episodes (order Belemnitida) using new species‐level database encompassing Hettangian–Aalenian interval (Early Jurassic – earliest Middle Jurassic) covering Western Tethys. Rarefied richness shows four‐fold increase from Planorbis chronozone to Ibex chronozone, strong decrease between Margaritatus Spinatum chronozones,...

Abstract Most of the known and most-complete Early Jurassic specimens plesiosaurians were recovered from United Kingdom Germany, few that age originate other areas in Europe. This study describes a new plesiosaurian taxon Toarcian deposits Luxembourg, Microcleidus melusinae , represented by most complete skeleton ever discovered this country. A preliminary phylogenetic analysis places within Microcleididae, as sister species previously included genus . The specimen studied here contributes...

The present paper deals with the systematic description of belemnite assemblages from Lower Jurassic, collected at Roche Blain quarry, Fresney-le-Puceux. In spite reduced thickness succession Fresney-le-Puceux, 13 successive ammonite chronozones could be documented in this rather unique outcrop situation mainland Europe. Twelve genera and 26 species belemnites belonging to Passaloteuthididae, Hastitidae, Megateuthididae, Salpingoteuthididae, family incertae sedis are described illustrated...

Abstract A re-examination of the early Toarcian fish fossils preserved in public paleontological collections Luxembourg revealed 70 specimens large pachycormid with an excellent three-dimensional preservation within calcareous nodules. Six them are associated octobrachian coleoid gladii their oesophagus or stomach, association not previously described from Luxembourg. The pachycormids ascribed to Pachycormus macropterus (Blainville, 1818) and Saurostomus esocinus Agassiz, 1843 while...

Abstract The evolutionary history of the cephalopod order Vampyromorpha with its only recent representative, Vampyroteuthis infernalis , deep-sea vampire squid, is still obscure and a new specimen from Early Jurassic Luxembourg, provides information on vampyromorph morphology at this period. taxon Simoniteuthis michaelyi . gen. n. sp., which based nearly complete gladius associated head–arm complex, morphologically intermediate between families Loligosepiidae Geopeltidae. Interestingly, arm...

Belemnite rostra are very abundant in Mesozoic marine deposits many regions. Despite this abundance, soft-tissue specimens of belemnites informing about anatomy and proportions these coleoid cephalopods extremely rare limited to a few moderately large genera like Passaloteuthis Hibolithes. For all other genera, we can make inferences on their body as well mantle length by extrapolating from complete material. We collected data the hard parts some Jurassic order learn shared characteristics...

Jurassic belemnites represent promising proxies especially for palaeoecological and also palaeobiogeographical reconstructions. However, basic knowledge on taxonomic composition, biostratigraphy diversity of Early is still dramatically low, France. The present study provides new data from the southern part Northwest European Province. More than 700 specimens have been collected along Tournadous section in Causses Basin (Southern France); they ten genera 30 species belonging to Hastitidae,...

Abstract The 1928 trial of José de León Toral, assassin Mexican caudillo Álvaro Obregón, afforded President Plutarco Elías Calles the opportunity to show domestic and international audiences that revolution had yielded a nation laws predicated on spiritual principles. Summary executions Catholics allowed detractors even sympathetic observers question depth civic values in Mexico. article shows how authorities deliberately presented hearing as concrete realization Calles's claim his...

At Peniche, Portugal, the GSSP for base of Toarcian and in a Submediterranean province, value 0.707 073 ± 0.000 002 (2s.e., n = 13) is determined 87Sr/86Sr at Toarcian. In Yorkshire, UK, Subboreal has an of0.707 072 23). The similarity values shows that, within analytical uncertainty, these levels are exactly equivalent time. Serpentinum (Falciferum/Levisoni) Chronozone 096 003 (2.s.e). this boundary Yorkshire 094 27). same ammonite successions occur through lowermost Peniche Yorkshire....

The anatomy and development of the tails at posterior part mantle were studied in several groups Recent extinct coleoid cephalopods; substantial differences their formation revealed. Males loliginid squid Alloteuthis spp. form tail by increased growth anterior gladius with simultaneous mantle. As a result, rolls longitudinally forming pseudoconus. attenuated males Lycoteuthis springeri (Lycoteuthidae) is supported from inside special rod-like apical vacuolated cartilage. Adults both sexes...