Cretaceous Research最新文献_第5页

First deciphering of large pterosaur footprints and their trackmaker in the Junggar Basin, China 首次破译中国准噶尔盆地大型翼龙足迹及其足迹制造者

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-11-08 DOI: 10.1016/j.cretres.2024.106036

Yang Li , Xiaolin Wang , Shunxing Jiang , Junyi Song

{"title":"First deciphering of large pterosaur footprints and their trackmaker in the Junggar Basin, China","authors":"Yang Li , Xiaolin Wang , Shunxing Jiang , Junyi Song","doi":"10.1016/j.cretres.2024.106036","DOIUrl":"10.1016/j.cretres.2024.106036","url":null,"abstract":"<div><div>Pterosaur footprints are important trace fossils for understanding the ecological habits of pterosaurs, and they are extremely rare worldwide. Within the Lower Cretaceous of the Junggar Basin of Xinjiang, hundreds of large pterosaur footprints have been unearthed. These imprints underwent a meticulous examination encompassing their dimensions, length-to-width ratio, proportions of digital and metatarsal parts, and divarication between digits of the manus imprints. A new ichnospecies, <em>Pteraichnus junggarensis</em> isp. nov., has been proposed based on these detailed analyses. By comparing these footprints with the anatomical characteristics of local larger pterosaur pedal bone fossils, it is suggested that the large-sized <em>P. junggarensis</em> footprints were produced by <em>Dsungaripterus weii</em>. The successful correlation between pterosaur fossils and their footprints within the Wuerho Pterosaur Fauna marks a momentous stride in deducing trackmakers based on their footprints. Moreover, estimates of pterosaur pes length and hip height were, for the first time, derived from a comprehensive scrutiny of 54 non-pterodactyloid and pterodactyloid specimens. A salient discovery was the markedly reduced ratio of hip height to pes length in non-pterodactyloid pterosaurs in comparison to their pterodactyloid counterparts. By employing fitted linear equations grounded on footprint dimensions, it is posited that the hip height for <em>Noripterus complicidens</em> ranges from 0.10 to 0.20 m, while for <em>D. weii</em>, it ranges from 0.28 to 0.46 m. Additionally, based on the ratio of stride length to hip height in the trackways, it is inferred that the trackmakers exhibited a typical walking gait, with speeds of 0.33 and 0.25 m/s, respectively.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106036"},"PeriodicalIF":1.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704620","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

Ichnotaxonomic and morphological differentiation in pterosaur tracks using Geometric Morphometric analysis: A case study on Pteraichnus manus tracks from Cretaceous East Asia 利用几何形态计量分析对翼龙足迹进行分类和形态分化：白垩纪东亚翼龙足迹案例研究

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-11-08 DOI: 10.1016/j.cretres.2024.106033

Jongyun Jung , Hyemin Jo , Minguk Kim , Min Huh

{"title":"Ichnotaxonomic and morphological differentiation in pterosaur tracks using Geometric Morphometric analysis: A case study on Pteraichnus manus tracks from Cretaceous East Asia","authors":"Jongyun Jung , Hyemin Jo , Minguk Kim , Min Huh","doi":"10.1016/j.cretres.2024.106033","DOIUrl":"10.1016/j.cretres.2024.106033","url":null,"abstract":"<div><div><em>Pteraichnus</em> is the most reported pterosaur ichnotaxa and the taxon with the largest number of reported ichnospecies. However, most ichnospecies of <em>Pteraichnus</em> are restricted to the type locality and type specimens and have not been expanded. This study employs two-dimensional landmark-based Geometric Morphometric analyses (GMA) to investigate the manus tracks of four ichnotaxa of <em>Pteraichnus</em> (<em>P. koreanensis, P. nipponensis, P. wuerhoensis</em>, and <em>P. gracilis</em>) from the Early Cretaceous of East Asia. These analyses are the first attempt to perform GMA on pterosaur ichnofossil and reveal that the morphological characteristics of these ichnotaxa are significantly distinguishable. In addition to traditional descriptive criteria, features such as the width of the digits and the metacarpal-phalangeal joint area were identified as valid criteria for numerical comparison. The results suggest that GMA can enhance the ichnotaxonomic classification of invalid or questionable ichnotaxa and provide taxonomic estimation for manus-only tracks. This approach highlights the potential for spatiotemporal comparisons between disparate pterosaur footprints. The distinct morphological features observed in tracks from relatively close localities suggest the presence of diverse pterosaur faunas across East Asia. Further research with an expanded dataset of pterosaurian ichnotaxa is recommended to refine ichnotaxonomic classifications and enhance our knowledge of pterosaur paleogeography.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106033"},"PeriodicalIF":1.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704621","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

Persistence of a shallow-marine environment in the western Kunlun area (northwestern Tibet) until the early Maastrichtian: Evidence from radiolitid rudist bivalves 昆仑西部地区（西藏西北部）浅海环境一直持续到马斯特里赫特早期：来自放射虫类原生双壳类的证据

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-11-08 DOI: 10.1016/j.cretres.2024.106035

Bintao Gao , Qinghai Zhang , Xin Rao , Lin Ding

{"title":"Persistence of a shallow-marine environment in the western Kunlun area (northwestern Tibet) until the early Maastrichtian: Evidence from radiolitid rudist bivalves","authors":"Bintao Gao , Qinghai Zhang , Xin Rao , Lin Ding","doi":"10.1016/j.cretres.2024.106035","DOIUrl":"10.1016/j.cretres.2024.106035","url":null,"abstract":"<div><div>The closing of the Tethys Ocean during the Mesozoic and Cenozoic dramatically affected the palaeogeography, palaeoenvironment and biotic evolution of the Tibetan Plateau and surrounding areas. The timing of closure of the Tethys Ocean in different areas is recorded by the youngest marine deposits. In the western Kunlun area of northwestern Tibet, the Tielongtan Group represents the youngest marine deposits, and is rich in rudist bivalves; however, its depositional age, particularly the age of final deposition, is poorly constrained. Systematic and palaeobiogeographic analyses were conducted on rudists from the Tielongtan Group in the eastern Loqzung Mountains. Four genera and two species were identified: <em>Biradiolites boldjuanensis</em>, <em>Gorjanovicia acuticostata</em>, <em>Durania</em> sp. and <em>Radiolites</em> sp. The occurrence of the lower Maastrichtian index fossil, <em>Biradiolites boldjuanensis</em>, indicates that deposition of the Tielongtan Group continued until the early Maastrichtian. Therefore, the results of this and previous studies indicate that deposition of the Tielongtan Group spanned from at least the Turonian to the early Maastrichtian. Palaeobiogeographical analyses show that <em>B</em>. <em>boldjuanensis</em> was endemic in Central Asia, whereas <em>G</em>. <em>acuticostata</em> might have extended beyond the Mediterranean region. During the Late Cretaceous, the shallow ocean in the western Kunlun area contained both cosmopolitan and endemic rudists.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106035"},"PeriodicalIF":1.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658854","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 beetle-like minute litter bug trapped in 99 million-year-old Kachin amber (Hemiptera, Dipsocoromorpha, Schizopteridae) 被困在距今 9,900 万年前的克钦琥珀中的甲虫状微小垃圾虫（半翅目，二角目，裂翅虫科）

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-11-07 DOI: 10.1016/j.cretres.2024.106034

Jun Chen , De Zhuo , Guangying Ren , Fei Yang , Baizheng An

{"title":"A beetle-like minute litter bug trapped in 99 million-year-old Kachin amber (Hemiptera, Dipsocoromorpha, Schizopteridae)","authors":"Jun Chen , De Zhuo , Guangying Ren , Fei Yang , Baizheng An","doi":"10.1016/j.cretres.2024.106034","DOIUrl":"10.1016/j.cretres.2024.106034","url":null,"abstract":"<div><div>Minute litter bugs (Dipsocoromorpha) constitute one of the most ancient and specialized lineages of Heteroptera. This infraorder displays an array of deviant body structures, such as dramatically varying tarsal formula, asymmetrical male abdominal terminal segments, and beetle-like appearance with elytriform tegmina. Most these unusual morphological traits have been reported in early dipsocoromorphans, except the stunning coleopteroid wings. Herein, a new minute litter bug, <em>Qiaoia menghaoae</em> Chen and Zhuo, gen. et sp. nov. is described from middle Cretaceous Kachin amber, northern Myanmar, representing the first beetle-like dipsocoromorphan in the Mesozoic. The new genus and species is characterized by three pairs of extremely strong spine-like trichobothria on vertex and pronotum, thoracic legs densely covered with tiny setae and long spines, hemelytra generally dark-stained and with a narrow bright transverse stripe in middle. Our new find further confirms that the grotesque morphological characteristics displayed in modern minute litter bugs have evolved and likely prevalent in their Cretaceous ancestors. Additionally, morphological analyses suggest some Mesozoic dipsocoromorphans including <em>Qiaoia menghaoae</em> Chen and Zhuo, gen. et sp. nov. probably lived in relatively open areas like arboreal habitats and were more mobile and active than their recent descendants, which are commonly with cryptic life style.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106034"},"PeriodicalIF":1.9,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658855","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

Early Aptian development and OAE 1a-linked demise of a carbonate platform in the western Tethys: Lower Cretaceous of Sierra Mariola (South Iberian Paleomargin, SE Spain) 特提斯西部早白垩世碳酸盐平台的发展和与 OAE 1a 有关的消亡：马里奥拉山脉（西班牙东南部，南伊比利亚古陆）下白垩统

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-30 DOI: 10.1016/j.cretres.2024.106032

Rafael Martínez-Rodríguez , José M. Castro , Ginés A. de Gea , Luis M. Nieto , Pedro A. Ruiz-Ortiz , Peter W. Skelton

{"title":"Early Aptian development and OAE 1a-linked demise of a carbonate platform in the western Tethys: Lower Cretaceous of Sierra Mariola (South Iberian Paleomargin, SE Spain)","authors":"Rafael Martínez-Rodríguez , José M. Castro , Ginés A. de Gea , Luis M. Nieto , Pedro A. Ruiz-Ortiz , Peter W. Skelton","doi":"10.1016/j.cretres.2024.106032","DOIUrl":"10.1016/j.cretres.2024.106032","url":null,"abstract":"<div><div>A carbonate platform succession of early Aptian age is described from the Sierra Mariola, which is located within the Prebetic Zone of the Betic External Zones (BEZ) of the Southern Iberian Palaeomargin, in SE Spain. The facies and stratigraphic architecture of the studied succession are described and analysed from multiple logged sections to characterize different depositional environments.</div><div>The cyclic stacking of facies observed suggests a possible orbital forcing of climate transmitted to sedimentation. Superbundles are recognized describing two sequences of Regressive-Transgressive (R-T) evolution. Analysis of carbon-isotope data identifies both the interval before the hyperthermal event of the early Aptian Oceanic Anoxic Event (OAE 1a) and the onset of the latter event, with an abrupt change in sedimentation marking the demise of the carbonate platform. The field outcrop thus preserves a record of the transition from a greenhouse world to a hothouse event.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106032"},"PeriodicalIF":1.9,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720615","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

A new oviraptorosaur from the Lower Cretaceous Miaogou Formation of western Inner Mongolia, China 中国内蒙古西部白垩纪下统庙沟地层出土的新卵盗龙

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-24 DOI: 10.1016/j.cretres.2024.106023

Mingze Hao , Zhiyu Li , Zhili Wang , Shuqiong Wang , Feimin Ma , Qinggele , J. Logan King , Rui Pei , Qi Zhao , Xing Xu

{"title":"A new oviraptorosaur from the Lower Cretaceous Miaogou Formation of western Inner Mongolia, China","authors":"Mingze Hao , Zhiyu Li , Zhili Wang , Shuqiong Wang , Feimin Ma , Qinggele , J. Logan King , Rui Pei , Qi Zhao , Xing Xu","doi":"10.1016/j.cretres.2024.106023","DOIUrl":"10.1016/j.cretres.2024.106023","url":null,"abstract":"<div><div>A new oviraptorosaur, <em>Yuanyanglong bainian</em> gen. et sp. nov. is described based on two specimens recovered from the Lower Cretaceous Miaogou Formation of the Maortu locality in Chilantai, Inner Mongolia, China. This new species is intermediate in morphology between the earliest-diverging and late-diverging oviraptorosaurs, and our phylogenetic analysis supports it as a sister taxon to the clade formed by Avimimidae and Caenagathoidea. Notably, this new early-diverging oviraptorosaur has an ilium with an extremely short postacetabular process and hindlimbs with proportionally elongate and fused lower segments, a character combination unknown among other oviraptorosaurs but common in wading birds, suggesting a potential ecology involving wading. Preserved gastroliths similar to <em>Caudipteryx</em> suggest a gastric mill function in our new species, and our preliminary observations indicate potential discrepancies in the digestion mode of early- and late-diverging oviraptorosaurs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"167 ","pages":"Article 106023"},"PeriodicalIF":1.9,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658853","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

Eolian-fluvial succession in the Early Cretaceous from the Ordos Basin 鄂尔多斯盆地早白垩世的风化-流积演替

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-22 DOI: 10.1016/j.cretres.2024.106031

Dawei Qiao , Nan Peng , Hongwei Kuang , Yongqing Liu , Yanxue Liu , Liwei Cui , Yuchong Wang

{"title":"Eolian-fluvial succession in the Early Cretaceous from the Ordos Basin","authors":"Dawei Qiao , Nan Peng , Hongwei Kuang , Yongqing Liu , Yanxue Liu , Liwei Cui , Yuchong Wang","doi":"10.1016/j.cretres.2024.106031","DOIUrl":"10.1016/j.cretres.2024.106031","url":null,"abstract":"<div><div>Cretaceous eolian deposits are widely developed in North China, among which the Lower Cretaceous eolian (erg) sedimentary strata in the Ordos Basin are the most representative. Many studies have been conducted on eolian deposits in the Ordos Basin, especially the Luohe Formation; however, there is a lack of systematic sedimentology research and the corresponding research on the evolution of sedimentary facies. Therefore, to explore the Mesozoic drought events and the systematic evolution of the sub-tropical erg zone, this study reports the fluvial–eolian sedimentary sequences of the Early Cretaceous Luohe and Yijinhuoluo Formations in the Ordos Basin. Spatially, through detailed sedimentary lithofacies and structural analysis of different outcrops, the combination law of sedimentary facies can be determined. Based on this, a three-dimensional sedimentary model of erg is reconstructed. The erg environment is divided into three sub-environments: erg margin, erg margin–centre transition and erg centre. According to the evolution of the sedimentary facies, the sedimentary evolution from the Latef Jurassic to the Early Cretaceous in the Ordos Basin is divided into five stages. The Ordos Basin has experienced the delta, erg formation, erg deposition, erg shrinkage and evaporating salt-lake stages. The vertical sedimentary evolution indicates climatic oscillation in North China from the Late Jurassic to the Early Cretaceous. Under the control of the sub-tropical high belt, the Ordos Basin experienced a hot and arid climate during the Cretaceous, forming a widely distributed erg belt in the region. During this period, a small-scale climate shock occurred under the hot and arid background, changing the sedimentary environment.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106031"},"PeriodicalIF":1.9,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554278","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 dance flies from Burmese amber providing the new insight to early evolution of feeding habits in Atelestidae (Diptera: Empidoidea) 缅甸琥珀中发现的新舞蝇，为了解Atelestidae（双翅目：Epidoidea）的早期食性进化提供了新的视角

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-20 DOI: 10.1016/j.cretres.2024.106025

Haoqiang Zhang , Yifan Hong , Chungkun Shih , Dong Ren , Yongjie Wang

{"title":"New dance flies from Burmese amber providing the new insight to early evolution of feeding habits in Atelestidae (Diptera: Empidoidea)","authors":"Haoqiang Zhang , Yifan Hong , Chungkun Shih , Dong Ren , Yongjie Wang","doi":"10.1016/j.cretres.2024.106025","DOIUrl":"10.1016/j.cretres.2024.106025","url":null,"abstract":"<div><div>The superfamily Empidoidea is a megadiverse group of Diptera that exhibits abundant morphological specializations for predatory feeding habits, with the mouthparts unequivocally representing the core apparatus and are highly associated with feeding behaviors. Nevertheless, the evolution of feeding habits in Empidoidea was not well documented especially due to the rarity of fossil evidence at the early stage. We describe a new genus with two new species of Atelestidae, namely <em>Promeghyperus muricicaudatus</em> Zhang, Shih, Ren et Wang gen. et sp. nov. and <em>P. hirtus</em> Zhang, Shih, Ren et Wang sp. nov. from the mid-Cretaceous Burmese amber. Details of mouthparts were well-preserved in the specimens of <em>P</em>. <em>muricicaudatus</em> gen. et sp. nov. that allows for a morphological functional analysis. The results reveal that these two mid-Cretaceous atelestid species retain the well-defined epipharyngeal blades and evolve a predaceous feeding habit in contrast to their extant relatives. The evolution of epipharyngeal blades in Empidoidea is summarized under the current phylogenetic framework. This finding not only enhanced the knowledge of species diversity of Empidoidea during the mid-Cretaceous but also provided the key evidence to document the evolution of feeding habits among Empidoidea. Based on the analysis of palaeogeographic occurrences of fossil and extant lineages, the evolutionay history of Atelestidae is outlined.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106025"},"PeriodicalIF":1.9,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571655","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

Classostrobus doylei, a new cheirolepidiaceous cone with in situ pollen from the Figueira da Foz Formation (lower Aptian – upper Albian), western Portugal Classostrobus doylei，葡萄牙西部 Figueira da Foz Formation（下古生代 - 上阿尔比统）出土的一种带有原位花粉的新栉水母圆锥体

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-18 DOI: 10.1016/j.cretres.2024.106028

Mário Miguel Mendes , Maria Tekleva , Jiří Kvaček , Pedro Callapez

{"title":"Classostrobus doylei, a new cheirolepidiaceous cone with in situ pollen from the Figueira da Foz Formation (lower Aptian – upper Albian), western Portugal","authors":"Mário Miguel Mendes , Maria Tekleva , Jiří Kvaček , Pedro Callapez","doi":"10.1016/j.cretres.2024.106028","DOIUrl":"10.1016/j.cretres.2024.106028","url":null,"abstract":"<div><div>The genus <em>Classostrobus</em> was established to accommodate unattached <em>Classopollis</em>-containing cones. It is noteworthy that <em>Classopollis</em> as a whole shows significant variation in morphological structure, and male cones bearing <em>Classopollis</em> pollen grains are rarer than vegetative organs of cheirolepidiaceous conifers. A new cheirolepidiaceous microsporangiate cone, <em>Classostrobus doylei</em>, containing <em>Classopollis triangulus</em> pollen grains is described for the first time based on a single specimen from sedimentary rocks exposed in the Carregueira open-cast clay pit complex close to the small village of Juncal, in the Estremadura region(Lusitanian Basin, western Portugal). The plant-bearing horizon from Carregueira is included in the basal part of the Famalicão Member of the Figueira da Foz Formation, considered to be of late Aptian – early Albian age. The new microsporangiate cone is small, about 2.0 mm long and 1.5 mm wide, ovoid in shape and of typically coniferous structure, probably belonging to <em>Pseudofrenelopsis zlatkoi</em>. The male cone consists of about 16 peltate, imbricated microsporophylls of deltoid shape. Each sporophyll is composed of a stalk and deltoid head showing abaxially 4–5 ovoid pollen sacs. The marginal parts of the sporophylls display long and unicellular trichomes. The observed <em>in situ</em> pollen grains are triangular to subcircular in outline, 16–28 μm in diameter, with an equatorial girdle, subequatorial rimula, proximal trilete scar and a distal cryptopore. The pollen ultrastructure is typical for <em>Classopollis</em>, except for the destroyed condition of the exine. The <em>in situ</em> pollen grains under study are consistent with the data on known dispersed <em>Classopollis triangulus</em>.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106028"},"PeriodicalIF":1.9,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554276","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

Cicada nymph trace fossils from South American Maastrichtian paleosols 南美洲马斯特里赫特古溶岩中的蝉蛹痕量化石

IF 1.9 3区地球科学

Cretaceous Research Pub Date : 2024-10-17 DOI: 10.1016/j.cretres.2024.106029

Diego Luciano Nascimento , Éverton Vinicius Valezio , Marcelo Krause

{"title":"Cicada nymph trace fossils from South American Maastrichtian paleosols","authors":"Diego Luciano Nascimento , Éverton Vinicius Valezio , Marcelo Krause","doi":"10.1016/j.cretres.2024.106029","DOIUrl":"10.1016/j.cretres.2024.106029","url":null,"abstract":"<div><div>The Cretaceous was a pivotal Period in the evolution of major insect groups, including cicadas. Insect diversification led to an increased complexity in the paleosol ichnofabrics due to the emergence of chambers associated with reproductive and feeding behaviors. Therefore, any new record of trace fossils attributed to cicadas from the Cretaceous period represent a significant advancement in understanding the diversification of this group and the emergence of insect feeding chambers, throughout the geological record. This work describes the record of the ichnogenus <em>Feoichnus</em> attributed to feeding chambers of cicada nymphs (Hemiptera: Cicadidae) from Maastrichtian paleosols developed in floodplain deposits of The Marília Formation (Bauru Basin, Brazil). The described <em>Feoichnus</em> chambers are elongated, hemispherical, and upwardly concave, with a lining covering the inner surface of the wall. The inner surface exhibits thin, irregular ridges and grooves, likely associated with fine roots. <em>Feoichnus</em> occurs in association with <em>Beaconites antarcticus</em> and root traces found within the feeding chamber, it could be indicating the movement of the trace maker and the feeding chamber from one root to another. These characteristics indicate the xylem-feeding behavior of <em>Feoichnus</em> trace maker in accordance with extant cicada nymph ecology. The presence of <em>Beaconites antarcticus</em> associated with <em>Feoichnus</em> and rhizoliths probably represents the foraging behavior of cicada nymphs and the displacement of feeding chambers in well-drained, rooted soils. Therefore, the cicada nymph could be the trace maker of both traces representing feeding and locomotion behavior. This contribution expands the knowledge about plant–insect interactions and insect groups that compose the Cretaceous paleosols ichnofabrics from South America.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106029"},"PeriodicalIF":1.9,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537852","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}

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