Papers in Palaeontology最新文献_第9页

Machine learning confirms new records of maniraptoran theropods in Middle Jurassic UK microvertebrate faunas 机器学习证实了英国中侏罗世微脊椎动物群中手盗龙兽脚亚目的新记录

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-03-01 DOI: 10.1002/spp2.1487

S. Wills, C. Underwood, P. Barrett

{"title":"Machine learning confirms new records of maniraptoran theropods in Middle Jurassic UK microvertebrate faunas","authors":"S. Wills, C. Underwood, P. Barrett","doi":"10.1002/spp2.1487","DOIUrl":"https://doi.org/10.1002/spp2.1487","url":null,"abstract":"Current research suggests that the initial radiation of maniraptoran theropods occurred in the Middle Jurassic, although their fossil record is known almost exclusively from the Cretaceous. However, fossils of Jurassic maniraptorans are scarce, usually consisting solely of isolated teeth, and their identifications are often disputed. Here, we apply different machine learning models, in conjunction with morphological comparisons, to a suite of isolated theropod teeth from Bathonian microvertebrate sites in the UK to determine whether any of these can be confidently assigned to Maniraptora. We generated three independent models developed on a training dataset with a wide range of theropod taxa and broad geographical and temporal coverage. Classification of the Middle Jurassic teeth in our sample against these models and comparison of the morphology indicates the presence of at least three distinct dromaeosaur morphotypes, plus a therizinosaur and troodontid in these assemblages. These new referrals significantly extend the ranges of Therizinosauroidea and Troodontidae by some 27 myr. These results indicate that not only were maniraptorans present in the Middle Jurassic, as predicted by previous phylogenetic analyses, but they had already radiated into a diverse fauna that pre‐dated the break‐up of Pangaea. This study also demonstrates the power of machine learning to provide quantitative assessments of isolated teeth in providing a robust, testable framework for taxonomic identifications, and highlights the importance of assessing and including evidence from microvertebrate sites in faunal and evolutionary analyses.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80337868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Silurian freshwater arthropod from northwest China 中国西北志留纪淡水节肢动物

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-03-01 DOI: 10.1002/spp2.1488

Ruiwen Zong, G. Edgecombe, Bingcai Liu, Yi Wang, Jiayi Yin, Juan Ma, Honghe Xu

{"title":"Silurian freshwater arthropod from northwest China","authors":"Ruiwen Zong, G. Edgecombe, Bingcai Liu, Yi Wang, Jiayi Yin, Juan Ma, Honghe Xu","doi":"10.1002/spp2.1488","DOIUrl":"https://doi.org/10.1002/spp2.1488","url":null,"abstract":"Animals breaking away from the sea was a revolutionary event in the evolution of life. Arthropods were the earliest metazoans to move onto land, and although a few Silurian freshwater and/or terrestrial arthropods have been found so far, these records are all from Laurussia. Here, we describe a new freshwater arthropod, Maldybulakia saierensis sp. nov., from the western Junggar, northwest China. Evidence from co‐occurring spores and body fossils of plants is presented in support of a Silurian (Pridoli) age for this new Maldybulakia species, alongside palaeosalinity data in support of our interpretation of it having lived in a freshwater environment. The discovery of this species brings forward the earliest appearance of the Maldybulakia, previously known from the Devonian of Kazakhstan and eastern Australia, to the late Silurian. It is the oldest body fossil record of a putatively freshwater arthropod outside Laurussia, and greatly expands their palaeogeographical distribution. In the middle and late Silurian, the discovery of freshwater arthropods on multiple plates/terranes, as well as their morphological diversity during this period, suggests that arthropods had left the marine environment by the early Silurian or even earlier.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72388663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 2

Phylogenetic position of Bohemiacinctus gen. nov. (Echinodermata, Cincta) from the Cambrian of Bohemia: implications for macroevolution and the role of taxon sampling in palaeobiological systematics 波希米亚寒武纪Bohemiacinctus gen. 11 .(棘皮目，中国科)的系统发育位置:宏观进化意义和分类群取样在古生物系统学中的作用

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1482

S. Zamora, D. Wright, M. Nohejlová

{"title":"Phylogenetic position of Bohemiacinctus gen. nov. (Echinodermata, Cincta) from the Cambrian of Bohemia: implications for macroevolution and the role of taxon sampling in palaeobiological systematics","authors":"S. Zamora, D. Wright, M. Nohejlová","doi":"10.1002/spp2.1482","DOIUrl":"https://doi.org/10.1002/spp2.1482","url":null,"abstract":"‘Asturicystis’ havliceki Fatka & Kordule from the middle Cambrian of Bohemia (Czech Republic) is re‐described based on its type material. Several features, including the extension of the food grooves and presence of ventral swellings suggest that ‘A.’ havliceki does not belong to Asturicystis, and is placed in the new genus Bohemiacinctus. To ascertain the phylogenetic position of Bohemiacinctus havliceki, we conducted Bayesian fossil tip‐dating and parsimony‐based phylogenetic analyses of 24 species spanning all major groups of cinctan higher taxa. Results show a high degree of congruence between tree topologies recovered by both tip‐dated and parsimony‐based analyses. Both methods indicate B. havliceki is phylogenetically distant from Asturicystis and is most likely to be an early representative of the family Sucocystidae. Overall, our phylogeny is broadly similar to previous estimates of cinctan relationships, including a more conventional phylogenetic position of controversial taxa such as Protocinctus. These results point to the sensitivity of small clades such as cinctans to taxon sampling effects, and highlights the importance of taxonomy and accurate morphological character descriptions in phylogenetic analyses of fossil taxa.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78089543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Allometry in Late Devonian Podocopa ostracods (Crustacea) and its implications for ostracod ontogeny 晚泥盆世足足甲壳类介形类异速发育特征及其对介形类个体发育的意义

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1480

Junjun Song, Bing Huang, Wenkun Qie

{"title":"Allometry in Late Devonian Podocopa ostracods (Crustacea) and its implications for ostracod ontogeny","authors":"Junjun Song, Bing Huang, Wenkun Qie","doi":"10.1002/spp2.1480","DOIUrl":"https://doi.org/10.1002/spp2.1480","url":null,"abstract":"Podocopa ostracods have abounded in various marine and non‐marine habitats since the early Palaeozoic and left a diverse fossil record in strata worldwide. This is particularly useful for stratigraphic correlation and palaeoenvironmental and palaeogeographical reconstructions. However, despite being the most numerous ostracods during the Palaeozoic, their origins, evolution, ontogeny and phylogeny remain poorly defined. This paper represents the first study of morphological variation in Devonian Platycopida ostracods (an order of Podocopa) using a geometric morphometric approach. Our results identify substantial shape variation in Cribroconcha honggulelengensis Song & Crasquin from the Upper Devonian Hongguleleng Formation of western Junggar, northwest China, demonstrating a remarkable change in juveniles between stages A‐3 and A‐2. Using linear regressions between principal component scores from right lateral view and carapace length, we demonstrate allometric growth patterns for this species. The body plan of C. honggulelengensis developed along an ontological variable: from an ovate outline with rare pores to an oblong outline with dense and large pores. Environmental factors should play an important role in shape determination during ontogeny of C. honggulelengensis.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88891039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 detritivory and sedimentivory in insects based on in situ gut contents from Triassic aquatic nymphs 基于三叠纪水生若虫原位肠道内容物的昆虫早期营养和沉积

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1478

E. Peñalver, R. Matamales‐Andreu, Josep Juárez‐Ruiz, A. Nel, R. Lozano, Ricardo Pérez‐de la Fuente

{"title":"Early detritivory and sedimentivory in insects based on in situ gut contents from Triassic aquatic nymphs","authors":"E. Peñalver, R. Matamales‐Andreu, Josep Juárez‐Ruiz, A. Nel, R. Lozano, Ricardo Pérez‐de la Fuente","doi":"10.1002/spp2.1478","DOIUrl":"https://doi.org/10.1002/spp2.1478","url":null,"abstract":"The colonization of freshwater by insects is one of the milestones in the establishment of continental ecosystems and, thus, of life on our planet. However, several key aspects of this process such as patterns of origination, early adaptations and palaeoecological relationships of the groups involved remain poorly known, namely due to the scarcity of significant assemblages. The Palaeozoic fossil record of freshwater insects is poor and unstudied in suitable detail. Here we analyse exceptionally preserved, three‐dimensional cololites (in situ gut contents) in abundant mayfly nymphs from Pedra Alta (lower Anisian, lowermost Middle Triassic; Mallorca, Spain), which probably inhabited lentic waters (pools) in a riverine ecosystem. This Konservat‐Lagerstätte shows an aquatic insect assemblage c. 2 myr older than the similar locality of Grès à Voltzia (Northern Vosges, France). Detailed morphological and elemental analysis show that the cololites are composed of the same very fine‐grained claystone as the fossil‐bearing rock. This study presents the oldest direct evidence of insect detritivory, as well as most probably that of sedimentivory. The trophic niche represented by insect sedimentivory in the early continental aquatic ecosystem of Pedra Alta is not known for the subsequent c. 240 myr of insect evolutionary history and up to the present. This lifestyle in extant insects is extremely infrequent and is known only in a few species of burrowing mayfly nymphs. Our findings illuminate the role of insects in detritus processing in relatively complex food webs shortly after the end‐Permian mass extinction event.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72659700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

Fossilized soft tissues in Palaeozoic bryozoans 古生代苔藓虫的软组织化石

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1483

A. Ernst

引用次数: 0

Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications 智利Pampa Castillo地区蛇形目(啮齿目，齿形目):新记录及其生物年代学意义

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1477

A. J. McGrath, J. J. Flynn, D. Croft, J. Chick, Holly E. Dodson, A. Wyss

{"title":"Caviomorphs (Rodentia, Hystricognathi) from Pampa Castillo, Chile: new octodontoid records and biochronological implications","authors":"A. J. McGrath, J. J. Flynn, D. Croft, J. Chick, Holly E. Dodson, A. Wyss","doi":"10.1002/spp2.1477","DOIUrl":"https://doi.org/10.1002/spp2.1477","url":null,"abstract":"Caviomorph rodents have been diverse and abundant components of South American mammal communities since the late Eocene. We describe herein the octodontoids of Pampa Castillo, a Lower Miocene site in southern Chile (Aysén Region). Six genera and seven species of octodontoids are present, two of which are new: Dudumus berggreni sp. nov. and Caviocricetus guenekko sp. nov. The octodontoids from Pampa Castillo support assignment of this fauna to the Santacrucian South American Land Mammal Age (SALMA), which is consistent with previous studies. We conducted similarity analyses on 11 Early–Middle Miocene Patagonian rodent faunas using hierarchical clustering. Faunas generally fell into the three SALMAs to which they were traditionally assigned: Colhuehuapian, Santacrucian and ‘post‐Santacrucian’. The ‘Pinturan’ is a proposed biochronological interval between the Colhuehuapian and Santacrucian. At the genus level, Pampa Castillo clustered with ‘Pinturan’ faunas, while at the species level it clustered with the ‘typical’ faunas on which the Santacrucian SALMA is based (from outcrops of the Santa Cruz Formation along the Atlantic coast and Río Santa Cruz). The Pampa Castillo rodent fauna resembles both ‘Pinturan’ and ‘typical’ Santacrucian faunas in taxon distributions, reflecting complex temporal and palaeoenvironmental influences. Geochronological data indicate that some ‘Pinturan’ sites overlap temporally with Pampa Castillo and the upper Pinturas Formation, which both clustered with ‘typical’ Santacrucian faunas. These results indicate that the ‘Pinturan’ does not represent a distinct biochronological interval, but that the differences between it and ‘typical’ Santacrucian faunas are attributable to geographic or palaeoenvironmental differences.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85361854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 1

A giant phytosaur (Diapsida, Archosauria) from the Upper Triassic of India with new insights on phytosaur migration, endemism and extinction 来自印度上三叠世的一种巨型植龙(始祖龙纲)，对植龙的迁徙、特有和灭绝有了新的认识

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1476

Debajit Datta, S. Ray

{"title":"A giant phytosaur (Diapsida, Archosauria) from the Upper Triassic of India with new insights on phytosaur migration, endemism and extinction","authors":"Debajit Datta, S. Ray","doi":"10.1002/spp2.1476","DOIUrl":"https://doi.org/10.1002/spp2.1476","url":null,"abstract":"A new Mystriosuchinae phytosaur, Colossosuchus techniensis, is described from the Upper Triassic Tiki Formation of India. Colossosuchus is diagnosed by multiple apomorphies, including a strongly downturned terminal rosette (c. 70°), closely spaced mediolateral band‐like ornamentation on dorsal surface of the nasal, dorsolaterally oriented supratemporal fenestra, ventrolaterally inclined postorbital–squamosal bars depressed below the skull table, dorsally convex parietal–squamosal bar that descends ventrolaterally below the skull roof, dome‐shaped skull in lateral view, prominent neural arch laminae and fossae, three sacral vertebrae, robust proximal end of the tibia, and fibula with high anteroposterior flaring of the distal end. The total body length of the largest individual recovered from the bonebed is estimated to be more than 8 m, suggesting that Colossosuchus is one of the largest phytosaurs known. Phylogenetic analysis nests Colossosuchus and other undescribed specimens from India within Mystriosuchinae. These form a distinct clade and represent the earliest record of endemism among Gondwanan phytosaurs. This clade is recovered as sister taxa to ((Volcanosuchus + Rutiodon) + Leptosuchomorpha), where the depressed supratemporal fenestra first appeared in the phytosaur lineage, a feature previously used to diagnose the derived leptosuchomorphs. Early‐diverging phytosaur diversification may have coincided with the final stages of the Carnian Pluvial Event with their possible migratory routes along the circum‐Tethyan coastline. The lineage continued to evolve mostly through endemic radiations and experienced an extinction event during early Norian, which marked the disappearance of most of the non‐leptosuchomorph taxa. This is attributed to post‐CPE aridification, although more study is required.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85690739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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: 2

An expanded Smithian–Spathian (Lower Triassic) boundary from a reefal build‐up record in Oman: implications for conodont taxonomy, high‐resolution biochronology and the carbon isotope record 阿曼珊瑚礁形成记录中扩展的Smithian-Spathian(下三叠统)边界:牙形石分类、高分辨率生物年代学和碳同位素记录的意义

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2023-01-01 DOI: 10.1002/spp2.1481

Marc Leu, H. Bucher, A. Baud, T. Vennemann, Zoneibe Luz, M. Hautmann, N. Goudemand

{"title":"An expanded Smithian–Spathian (Lower Triassic) boundary from a reefal build‐up record in Oman: implications for conodont taxonomy, high‐resolution biochronology and the carbon isotope record","authors":"Marc Leu, H. Bucher, A. Baud, T. Vennemann, Zoneibe Luz, M. Hautmann, N. Goudemand","doi":"10.1002/spp2.1481","DOIUrl":"https://doi.org/10.1002/spp2.1481","url":null,"abstract":"Some 2.7 myr after the Permian–Triassic boundary mass extinction, a stepwise extinction of the nekton (ammonoids and conodonts) ended at the Smithian–Spathian boundary (SSB) during an episode of climate cooling. SSB records from continental shelves are usually affected by an unconformity, suggesting a forced regression of glacio‐eustatic origin. Here, we document a new 30‐m‐thick SSB section from Jebel Aweri (Batain Plain, Oman) that provides an exceptionally complete and expanded record preserved in an exotic block. Most of this SSB section consists of microbial boundstone build‐ups with a framework of metazoan bioclasts that formed in shallow water on an offshore seamount. In Wadi Musjah (Hawasina nappes, Oman), another exotic block records the SSB in a deeper water setting represented by Hallstatt‐type facies. These two sections provide a unique perspective on the early Spathian rapid re‐diversification of conodonts. They led to a thorough revision of conodont taxonomy around the SSB and to the construction of the highest resolution biochronological scheme for this time interval in the Tethys. A total of five SSB sections from Oman representing both offshore seamounts and lower slope deposits were included in a high‐resolution, quantitative unitary associations (UA) analysis. The resulting 8 conodont biozones are intercalibrated with ammonoid zones and with the carbonate carbon isotope record ultimately placing the SSB in the interval of separation between UAZ3 and UAZ4. Only the association of Novispathodus pingdingshanensis with Icriospathodus crassatus can be used to unambiguously characterize the base of the Spathian.","PeriodicalId":48705,"journal":{"name":"Papers in Palaeontology","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76204776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Anatomy, palaeoautecology and phylogenetic affinity of tubular Glossolites magnus from the early Cambrian Chengjiang biota, South China 早寒武世澄江生物群管状大柔石的解剖、古技术及系统发育亲缘关系

IF 2.3 2区地球科学

Papers in Palaeontology Pub Date : 2022-11-01 DOI: 10.1002/spp2.1473

Hai-Ning Sun, Fangchen Zhao, Maoyan Zhu

引用次数: 1