Cretaceous Research最新文献_第8页

The restudy of Haopterus gracilis from the Yixian Formation, Liaoning, China 中国辽宁义县地层 Haopterus gracilis 的再研究

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-06-03 DOI: 10.1016/j.cretres.2024.105933

Yizhi Xu , Shunxing Jiang , Xiaolin Wang

{"title":"The restudy of Haopterus gracilis from the Yixian Formation, Liaoning, China","authors":"Yizhi Xu , Shunxing Jiang , Xiaolin Wang","doi":"10.1016/j.cretres.2024.105933","DOIUrl":"10.1016/j.cretres.2024.105933","url":null,"abstract":"<div>Abundant and diverse pterosaur records have been reported from the Jehol Biota since the end of the last century, including an early reported member, Haopterus gracilis, from the Yixian Formation. The referral of Haopterus gracilis has been a subject of debate since its discovery. Various phylogenetic analyses have suggested different positions for Haopterus gracilis, including the sister taxon of the Ornithocheiroidea or placed differently in the Pteranodontoidea. Recent research has proposed that Haopterus gracilis is the sister-taxon of the Lebanese istiodactyliform Mimodactylus libanensis. Here we redescribe the holotype and only specimen of Haopterus gracilis, a relatively complete skeleton of a juvenile individual in detail using Micro-CL scanning. Haopterus possesses several pteranodontoid features including a stout scapula shorter than the coracoid, a sternum with a constriction posterior to the sternocoracoid articulations, and humeri with trapezoidal deltopectoral crests and constricted mid-shafts. A close affinity between Haopterus and istiodactylids has been suggested by several researchers, whereas some features of Haopterus revealed here distinguish Haopterus from istiodactylids, including the low skull with a long rostrum occupying more than half the skull length anterior to the jaw articulation, and a long tooth row with different tooth morphologies. The phylogenetic position of Haopterus was reevaluated by utilizing a more comprehensive character matrix derived from three previous matrices. The new analysis revealed Haopterus in the Pteranodontoidea and, within this clade, it was an istiodactyliform. The study of Haopterus holds potential significance in enhancing our understanding of the morphology and taxonomy of short-toothed pteranodontoids.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105933"},"PeriodicalIF":2.1,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141276345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New mammals from the Upper Cretaceous Allen Formation (Patagonia, Argentina) and reassessment of meridiolestidan diversity 上白垩世艾伦地层（阿根廷巴塔哥尼亚）出土的新哺乳动物以及美利达动物多样性的重新评估

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-31 DOI: 10.1016/j.cretres.2024.105935

Brigid E. Connelly , Mauricio S. Cardozo , Joshua D. Montgomery , Guillermo W. Rougier

{"title":"New mammals from the Upper Cretaceous Allen Formation (Patagonia, Argentina) and reassessment of meridiolestidan diversity","authors":"Brigid E. Connelly , Mauricio S. Cardozo , Joshua D. Montgomery , Guillermo W. Rougier","doi":"10.1016/j.cretres.2024.105935","DOIUrl":"https://doi.org/10.1016/j.cretres.2024.105935","url":null,"abstract":"<div>Dryolestoid mammals are classical members of the Jurassic faunas of Laurasia but mostly absent during the Cretaceous. The reverse is true in Gondwana in general and South America in particular, where meridiolestid dryolestoids are dominant in the Late Cretaceous. We describe here 21 new mammalian specimens from the Upper Cretaceous locality Cerro Tortuga (Allen Formation, Patagonia, Argentina) collected via screenwashing, which we identify as meridiolestid dryolestoids. We recognize a new species of meridiolestid and reassign a previously described specimen to the new taxon. The morphology of these new remains represents a new morphotype in the spectrum of meridiolestid diversity, recording a broadening of trophic adaptations from the ancestral insectivory to the more derived herbivory observed among the later and more derived members of the group. The novel dental morphology helps bridge the anatomy of the plesiomorphic sharp-toothed meridiolestidans with that of the more derived and bunodont mesungulatoids. The new taxon suggests that development of both broad cingulids and complex crown morphology precede the development of the wide compressed roots, bunodonty, and thickened enamel characteristic of derived mesungulatids. Other specimens from the collection are referable to taxa previously known from the same locality. These provide new information about tooth positioning, dental formula, and overall dental morphology. The new material suggests that Groebertherium, previously regarded as a dryolestid taxon, is in fact a likely member of Meridiolestida.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105935"},"PeriodicalIF":2.1,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141329244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Early Cretaceous tree fern Acanthopteris (Dicksoniaceae): New insight into fossil records, species diversity, palaeogeography and palaeoclimate 早白垩世树蕨Acanthopteris（Dicksoniaceae）：化石记录、物种多样性、古地理学和古气候的新见解

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-05-29 DOI: 10.1016/j.cretres.2024.105934

Meng Yuan , Yong-Dong Wang , Xu Zhou , Ya Li , Yi-Ming Cui , Li Zhang

{"title":"The Early Cretaceous tree fern Acanthopteris (Dicksoniaceae): New insight into fossil records, species diversity, palaeogeography and palaeoclimate","authors":"Meng Yuan , Yong-Dong Wang , Xu Zhou , Ya Li , Yi-Ming Cui , Li Zhang","doi":"10.1016/j.cretres.2024.105934","DOIUrl":"https://doi.org/10.1016/j.cretres.2024.105934","url":null,"abstract":"<div>Acanthopteris is a fossil fern genus that was established by H.C. Sze in 1931 based on leaf remains from the Lower Cretaceous of the Fuxin Basin in Liaoning Province, China. Traditionally, Acanthopteris is considered to belong to the tree fern family Dicksoniaceae and has been mainly found in the Lower Cretaceous of Fuxin Basin, Huolinhe Basin, and other coeval basins in Northeast China. Since this genus was founded, five fossil species have been described, including A. gothani Sze, A. acutata (Samylina) Zhang, A. alata (Fontaine) Zhang, A. onychioides (Vassilevskaja et Kara-Mursa) Zhang, and A. szei Cao. Based on the investigations on the newly collected fossil specimens and the examinations of other specimens, a reassessment of the systematics and fossil record of Acanthopteris is performed by using both morphological and cluster analysis approaches. The emendation of generic diagnosis of Acanthopteris is provided herein. Geographically, Acanthopteris shows limited distribution in North and NE China, Siberia, Russia and the Inner Zone of Japan. Temporally, Acanthopteris is restricted to the Aptian-Albian period, representing a climate index fossil for a warm and humid climate condition of tropical to subtropical zones during the Early Cretaceous.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105934"},"PeriodicalIF":1.9,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141479507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new Gondwanan perspective on the Jurassic-Cretaceous transition from the Tithonian-Berriasian interval of southeastern Morocco 从摩洛哥东南部的提托尼安-白垩纪间隙看侏罗纪-白垩纪过渡的新冈瓦纳视角

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-23 DOI: 10.1016/j.cretres.2024.105932

Hassan Aouraghe , Rachid Chennouf , Hamid Haddoumi , Maxime Lasseron , Hicham Mhamdi , Emmanuel Gheerbrant , Jeremy E. Martin

{"title":"A new Gondwanan perspective on the Jurassic-Cretaceous transition from the Tithonian-Berriasian interval of southeastern Morocco","authors":"Hassan Aouraghe , Rachid Chennouf , Hamid Haddoumi , Maxime Lasseron , Hicham Mhamdi , Emmanuel Gheerbrant , Jeremy E. Martin","doi":"10.1016/j.cretres.2024.105932","DOIUrl":"10.1016/j.cretres.2024.105932","url":null,"abstract":"<div>Knowledge of continental faunas and floras from the Jurassic–Cretaceous transition in Gondwana, and especially in Africa, is limited. Here, we report the discovery of a rare assemblage of plants and aquatic reptiles from the Tithonian–Berriasian interval of the Anoual syncline in southeastern Morocco. Our preliminary field investigations led to the discovery of a disarticulated skeleton of a goniopholidid crocodylomorph, of a single fragment of a turtle plate, and of abundant plant remains, inviting further exploitation of the fossiliferous horizon. This assemblage indicates a freshwater habitat bordered by a lush moist conifer forest. Its taxonomic composition shows a strong similarity with better known contemporaneous Laurasian assemblages and stresses the paucity of coeval Gondwanan assemblages. Our discovery highlights that peri-Tethys continental assemblages may have shared common taxa and raises the question whether Laurasian and Gondwanan taxa from the Jurassic-Cretaceous transition were cosmopolitan, before they diverged later during the Cretaceous.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105932"},"PeriodicalIF":2.1,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141134081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The K/Pg event at high southern latitudes: New evidence from continental deposits in the Magallanes/Austral Basin, Patagonia, South America 南半球高纬度地区的K/Pg事件：来自南美洲巴塔哥尼亚马加拉内斯/澳大利亚盆地大陆沉积的新证据

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-22 DOI: 10.1016/j.cretres.2024.105931

Leslie M.E. Manríquez , Guilherme Krahl , Marcelo A. Carvalho , Ernesto L.C. Lavina , Gustavo Santiago , Marlone H.H. Bom , Gerson Fauth , Marcelo Leppe

{"title":"The K/Pg event at high southern latitudes: New evidence from continental deposits in the Magallanes/Austral Basin, Patagonia, South America","authors":"Leslie M.E. Manríquez , Guilherme Krahl , Marcelo A. Carvalho , Ernesto L.C. Lavina , Gustavo Santiago , Marlone H.H. Bom , Gerson Fauth , Marcelo Leppe","doi":"10.1016/j.cretres.2024.105931","DOIUrl":"10.1016/j.cretres.2024.105931","url":null,"abstract":"<div>The Cretaceous/Paleogene boundary (K/Pg) event, associated with a meteorite impact at Chicxulub, Mexico, is globally recognized as one of the largest mass extinctions in natural history, marking the end of the Mesozoic Era. However, most of the outcrops with records and geochemical evidence of this boundary are distributed in the Northern Hemisphere and at mid-latitudes. Here, aiming to contribute to the knowledge of this event at high southern latitudes, we characterize a single iridium anomaly correlated with the K/Pg boundary, present within a carbonaceous mudstone level in a continental depositional environment in the Río de las Chinas Valley, Chilean Patagonia. High-resolution geochemical and palynofacies analyses were performed on a stratigraphic section from the top of the Dorotea Formation. Results showed that the iridium enrichment coincides with an anomaly of other platinum group elements. In addition, the palynofacies analysis showed a disturbance in the depositional environment, marked by an abrupt change from non-degraded phytoclasts (e.g., cuticles) to pseudoamorphous and degraded cuticles, and by an increase in the abundance of spores at the same level. The Río de las Chinas Valley locality provides new evidence for the comprehensive study of the end-Cretaceous event, from the poorly represented continental environments of high southern latitudes.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105931"},"PeriodicalIF":2.1,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141138928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additions to the subfamily Acanthohoplitinae from the British Isles, including the first verifiable record of Acanthohoplites (Lower Cretaceous, upper Aptian) 不列颠群岛 Acanthohoplitinae 亚科的新成员，包括 Acanthohoplites（下白垩统，上古宙）的首次可核实记录

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-14 DOI: 10.1016/j.cretres.2024.105921

Jens Lehmann , H. Mark Bayliss

{"title":"Additions to the subfamily Acanthohoplitinae from the British Isles, including the first verifiable record of Acanthohoplites (Lower Cretaceous, upper Aptian)","authors":"Jens Lehmann , H. Mark Bayliss","doi":"10.1016/j.cretres.2024.105921","DOIUrl":"10.1016/j.cretres.2024.105921","url":null,"abstract":"<div>Acanthohoplites aschiltaensis, a late Aptian ammonite originally described from the Caucasus of Dagestan, is recognised from the British Isles for the first time. A study of the full ontogenetic development of this species is enabled owing to the preservation of a mature body-chamber, not previously known. Stratigraphically, it confirms the correlation of the Fullers' Earth deposits within the Parahoplites nutfieldiensis Zone at Baulking, Oxfordshire, with strata of the Parahoplites melchioris Zone at the type locality and elsewhere. Palaeobiogeographically, it underlines the strong relationship between the Boreal fauna of western Europe and that of the Mediterranean-Caucasian Subrealm of the Tethyan realm. Additionally, a small Hypacanthoplites spp. fauna is described from the H. rubricosus Subzone of the Hypcanthoplites jacobi Zone at the Aptian/Albian boundary interval exposed in the Shanklin area, Isle of Wight. From this locality, otherwise almost devoid of ammonite remains, we present fairly well-preserved specimens of ‘Hypacanthoplites’ elegans, H. plesiotypicus, H. pricei, H. tenuiformis, H. rubricosus, H. sigmoidalis and H. sp. 1 indet., only known thanks to some decades of intensive collecting. In addition to the other members of this genus previously described from the British Isles, the occurrence of ‘H.’ elegans and H. plesiotypicus further supports the existence of narrow sea connections eastwards onto the European continent.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105921"},"PeriodicalIF":2.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0195667124000946/pdfft?md5=f45decaafba9acd4cf7335199d1743c1&pid=1-s2.0-S0195667124000946-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141050666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upside down: Resilience and recolonization of overturned stromatolite from the Maastrichtian-Danian Yacoraite formation (northwestern Argentina) 颠倒：阿根廷西北部马斯特里赫特-二迭纪亚科拉特岩层翻转叠层石的恢复力与重新定居

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-09 DOI: 10.1016/j.cretres.2024.105917

Gabriel Ricardo López Isla , Patricio Guillermo Villafañe , Lucas Quiroga , Julia Jimeno-Alda , Paolo Citton , Silvina de Valais , Carlos Alfredo Cónsole-Gonella , Ignacio Díaz-Martínez

{"title":"Upside down: Resilience and recolonization of overturned stromatolite from the Maastrichtian-Danian Yacoraite formation (northwestern Argentina)","authors":"Gabriel Ricardo López Isla , Patricio Guillermo Villafañe , Lucas Quiroga , Julia Jimeno-Alda , Paolo Citton , Silvina de Valais , Carlos Alfredo Cónsole-Gonella , Ignacio Díaz-Martínez","doi":"10.1016/j.cretres.2024.105917","DOIUrl":"10.1016/j.cretres.2024.105917","url":null,"abstract":"<div>Stromatolites are organo-sedimentary structures, internally laminated, which grow attached to the substrate. This lamination mirrors the dynamic interaction of environmental and biological factors where its formation takes place. However, some stromatolites from the Yacoraite Formation, from Amblayo locality, in northwestern Argentina, present an unconventional internal structure characterized by bilateral symmetry, where the development of lamination extends towards both sides of an imaginary plane.This contribution reports a multi-scale analysis of these particular stromatolites, with the aim of determining the extent to which environmental factors have influenced their internal structure. In addition to this, a sequence of stages that gave rise to these organo-sedimentary structures will be proposed.Results suggest a microbialitic growth by in-situ biologically induced, carbonate precipitation, which was carried out in a shallow intertidal environment with good luminosity and significant sedimentary input. However, the stromatolitic growth occurred over two stages, interrupted by a stochastic event that generated a overturning of the structure, providing a new colonizing surface for growth of microorganisms and resulting in a bilateral internal structure.The characterization of these stages, including the overturning of the structure, not only provides a highly accurate proxy for reconstructing punctual environmental conditions of the Yacoraite Formation, but also opens up a field of discussion focused on the resilience and recolonization capacity of stromatolite-producing microorganisms after stochastic events.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"161 ","pages":"Article 105917"},"PeriodicalIF":2.1,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141046728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new remarkable big-eyed minute litter bug in Cenomanian Kachin amber from Myanmar (Hemiptera, Dipsocoromorpha, Leptopodidae) 缅甸克钦琥珀中发现的一种新的非凡的大眼小虫（半翅目，二足目，鳞翅目

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-09 DOI: 10.1016/j.cretres.2024.105919

Jun Chen , De Zhuo

{"title":"A new remarkable big-eyed minute litter bug in Cenomanian Kachin amber from Myanmar (Hemiptera, Dipsocoromorpha, Leptopodidae)","authors":"Jun Chen , De Zhuo","doi":"10.1016/j.cretres.2024.105919","DOIUrl":"10.1016/j.cretres.2024.105919","url":null,"abstract":"<div>The Dipsocoromorpha is a small modern heteropteran infraorder, with some fossils documented in Mesozoic amber in recent years. We herein report a new remarkable specimen trapped in mid-Cretaceous Kachin amber, which can be attributed to Dipsocoromorpha: Schizopteridae. Kuanzuia cavanii gen. et sp. nov. is erected for the new specimen on the basis of the following unique autapomorphic characteristics amongst known dipsocoromorphans: pronotal second and third lobes completely fused together and embowed, metafemora nearly triangular in lateral view and with one row of c. 20 strong ventral spines, and metatibiae greatly curved at about its 2/3 length. Mesozoic dipsocoromorphan fossils reported in America, Lebanon, France and Myanmar provide paleontological evidences that this ancient heteropteran insect lineage had probably been distributed worldwide at latest in the Early to mid-Cretaceous. Our new finding further indicates that compared to their modern descendants, early dipsocoromorphans in the late Mesozoic were flourishing and also likely with high morphological disparity.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"161 ","pages":"Article 105919"},"PeriodicalIF":2.1,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141056049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Re-investigation of the Mesozoic cycad genus Chilinia: Fossil record, diversity, spatio-temporal distribution, and palaeoclimate implications 中生代苏铁属Chilinia的再调查：化石记录、多样性、时空分布和古气候影响

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-07 DOI: 10.1016/j.cretres.2024.105920

Mengge Li , Yongdong Wang , Ya Li , Yanbin Zhu

{"title":"Re-investigation of the Mesozoic cycad genus Chilinia: Fossil record, diversity, spatio-temporal distribution, and palaeoclimate implications","authors":"Mengge Li , Yongdong Wang , Ya Li , Yanbin Zhu","doi":"10.1016/j.cretres.2024.105920","DOIUrl":"10.1016/j.cretres.2024.105920","url":null,"abstract":"<div>Chilinia is an extinct genus of cycads, established by Li and Ye in 1964 based on leaf fossils from the Lower Cretaceous in Jilin Province, China. Morphologically, the genus Chilinia closely resembles Ctenis, another cycad foliage genus, in having pinnately divided leaves with laterally inserted pinnae on the rachis and reticulate venation but differs mainly from the latter in having toothed or irregularly lobed rather than entire-margined pinnae. Fossil records show that up to now, nine species of Chilinia have been reported worldwide, representing an index fossil plant in the Jurassic to Early Cretaceous. In this study, we present a comprehensive overview of all reported Chilinia fossils from a systematic palaeobotanical perspective. Fossil records indicate that Chilinia mainly occurred in the middle–high latitudes of the northern and southern hemispheres in Pangea from the Middle Jurassic to Middle Cretaceous. Combined evidence from the morphology of Chilinia and its floral patterns suggests that the genus probably lived in humid warm-temperate palaeoclimatic conditions with brief seasonal variations.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"162 ","pages":"Article 105920"},"PeriodicalIF":2.1,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141041755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ammonoid and coleoid jaws from the Upper Cretaceous of northern Siberia (Nizhnyaya Agapa River sections) 西伯利亚北部上白垩世（下阿加帕河段）的氨类和鞘类颚骨

IF 2.1 3区地球科学

Cretaceous Research Pub Date : 2024-05-06 DOI: 10.1016/j.cretres.2024.105918

Aleksandr Mironenko , Mikhail Rogov , Alexey Ippolitov , Irina Smurova , Victor Zakharov

{"title":"Ammonoid and coleoid jaws from the Upper Cretaceous of northern Siberia (Nizhnyaya Agapa River sections)","authors":"Aleksandr Mironenko , Mikhail Rogov , Alexey Ippolitov , Irina Smurova , Victor Zakharov","doi":"10.1016/j.cretres.2024.105918","DOIUrl":"https://doi.org/10.1016/j.cretres.2024.105918","url":null,"abstract":"<div>The jaws of cephalopods, ammonites and especially coleoids, are rarely met in fossil state. The localities with diversified jaws, belonging to various groups of fossil cephalopods are even less common. We describe a diversified complex of cephalopod jaws from the upper Cenomanian–middle Turonian of Northern Siberia, which include the upper and lower jaws of Placenticeras ammonites (the oldest placenticeratid jaws known to date) and large-sized jaws of octobrachian coleoids. Although the lower jaws of Placenticeras belong to the aptychus type of ammonoid jaw apparatuses, they are characterized by the thickening of an inner organic layer in their anterior part, with a shape resembling a calcified conchorhynch known in the anterior portion of the lower jaws of Mesozoic nautilids and lytoceratid and phylloceratid ammonoids. The presence a conchorhynch-like structure supports the assumption that the feeding function in placenticeratid lower jaws most likely prevailed over the protective one. The upper jaws of Placenticeras show structure, typical for the jaws of aptychophoran ammonites: an inner lamella, divided into two wings, and a pointed outer lamella. Large-sized upper jaws of octobrachian coleoids demonstrate close affinities with the jaws of Octopoda suggesting that they could have belonged to representatives of this order, probably to large-sized gladius-bearing teudopseins. Judging by the jaws' size, both ammonites and octobrachians, which inhabited the marine basin in the Northern Siberia, were characterized by large body size. The cephalopod assemblage remained unchanged throughout the end of the Cenomanian and the first half of the Turonian.</div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"161 ","pages":"Article 105918"},"PeriodicalIF":2.1,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140947683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0