Pub Date : 2025-09-04DOI: 10.1016/j.palwor.2025.201010
Michael S. Engel , Mounir Maalouf , André Nel , Dany Azar
A new genus of aphids (Hemiptera: Aphidomorpha) is described and figured from an alate female preserved in amber from the Lower Cretaceous outcrop of Bqaatouta at El-Shqif, central Lebanon. Melqartaphis media n. gen. n. sp., is remarkable for many traits but most notably the presence of three-branched medial vein and a complex structure of terminalia with four tubelike tubercles. The group belongs to the Tajmyraphididae. The genus is diagnosed and its affinities with other Mesozoic lineages of aphids are briefly discussed.
从黎巴嫩中部El-Shqif的Bqaatouta下白垩世露头的琥珀中保存的一只晚期雌性蚜虫中描述和发现了一个新的蚜虫属（半翅目：蚜虫科）。Melqartaphis media n. gen. n. sp，在许多特征上都是显著的，但最显著的是存在三个分支的内侧静脉和具有四个管状结节的复杂终末结构。这一类群属于踏足蛛科。对该属进行了诊断，并简要讨论了它与其他中生代蚜虫谱系的亲缘关系。
{"title":"A new genus of aphids from the Bqaatouta outcrop of Lower Cretaceous Lebanese amber (Hemiptera: Tajmyraphidoidea)","authors":"Michael S. Engel , Mounir Maalouf , André Nel , Dany Azar","doi":"10.1016/j.palwor.2025.201010","DOIUrl":"10.1016/j.palwor.2025.201010","url":null,"abstract":"<div><div>A new genus of aphids (Hemiptera: Aphidomorpha) is described and figured from an alate female preserved in amber from the Lower Cretaceous outcrop of Bqaatouta at El-Shqif, central Lebanon. <em>Melqartaphis media</em> n. gen. n. sp., is remarkable for many traits but most notably the presence of three-branched medial vein and a complex structure of terminalia with four tubelike tubercles. The group belongs to the Tajmyraphididae. The genus is diagnosed and its affinities with other Mesozoic lineages of aphids are briefly discussed.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 201010"},"PeriodicalIF":1.7,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418053","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}
Pub Date : 2025-08-30DOI: 10.1016/j.palwor.2025.201007
Daniyar R. Khantemirov , Dmitriy O. Gimranov , Qi-Gao Jiangzuo , Tariel M. Eybatov
In this paper we redescribe the specimens of “Eldari hyena” from the Upper Miocene site of Eldari, Azerbaijan. The material, which was previously described as Hyaena eldarica includes one maxilla fragment as well as the holotype mandibular fragment with p3-p4 that is unfortunately lost. The upper teeth morphology of Eldari specimen is typical for percrocutids and Dinocrocuta gigantea specifically. The teeth size of Eldari hyena also falls within the range of D. gigantea. The lost hemimandible exhibits morphology similar to D. gigantea and is close to it in size, based on published data. At the same time, it differs from other specimens of D. gigantea in having shorter p4 and more pronounced p3 mesial accessory cusps. These are the first D. gigantea specimens described from Caucasus.
{"title":"Dinocrocuta gigantea from the Upper Miocene site of Eldari, Azerbaijan","authors":"Daniyar R. Khantemirov , Dmitriy O. Gimranov , Qi-Gao Jiangzuo , Tariel M. Eybatov","doi":"10.1016/j.palwor.2025.201007","DOIUrl":"10.1016/j.palwor.2025.201007","url":null,"abstract":"<div><div>In this paper we redescribe the specimens of “Eldari hyena” from the Upper Miocene site of Eldari, Azerbaijan. The material, which was previously described as <em>Hyaena eldarica</em> includes one maxilla fragment as well as the holotype mandibular fragment with p3-p4 that is unfortunately lost. The upper teeth morphology of Eldari specimen is typical for percrocutids and <em>Dinocrocuta gigantea</em> specifically. The teeth size of Eldari hyena also falls within the range of <em>D</em>. <em>gigantea</em>. The lost hemimandible exhibits morphology similar to <em>D</em>. <em>gigantea</em> and is close to it in size, based on published data. At the same time, it differs from other specimens of <em>D</em>. <em>gigantea</em> in having shorter p4 and more pronounced p3 mesial accessory cusps. These are the first <em>D</em>. <em>gigantea</em> specimens described from Caucasus.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201007"},"PeriodicalIF":1.7,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929004","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}
Pub Date : 2025-08-30DOI: 10.1016/j.palwor.2025.201008
Shi-Xin Li , Zhi-Heng Ma , Xi Zhang , Wei Yang , Jian-Li Zeng , Mihai Emilian Popa , Kai-Nan Mao , Ting-Shan Zhang
The Carnian Pluvial Episode (CPE) in the Early Mesozoic was an extreme climate event that globally perturbed the Carbon cycle, significantly enhanced the hydrological cycle, and intensified ocean anoxia due to global warming, thereby exerting a significant influence on sedimentary environments. This study investigates the CPE in South China through integrated biostratigraphic, petrological, and geochemical analyses. Our findings of δ13C records reveal a progressive increase from 1.71‰ to 3.54‰ and 1.53‰ to 2.88‰ in the lower to middle Julian 1 substage, followed by a major negative excursion from 2.91‰ to 1.47‰ and 2.88‰ to 1.09‰ in the late Julian 1 at the Yongning and the Wusha sections respectively. The δ13C records from the two study sections generally correlate well with each other and are earlier than published records. Moreover, fluctuations observed in various redox proxies (U/Th, V/Cr, V/(V+Ni), Mo/Al) strongly coincide with δ13C excursions during the late Julian 1 substage, pointing the marine environment shift from oxic to dysoxic/anoxic condition. While the carbonate platforms are overlain by deep-water anoxic facies at the Yongning section. Sr and Ba levels revealed a significant freshwater influx during the CPE, leading to oscillating decreases in palaeosalinity within the study area. In addition, recorded data for Al, Zr, Hf, Ti and Th suggest that the intensified continental weathering, resulted from a humid climate during the CPE, increased the terrigenous clastic input.
{"title":"Onset timing and palaeoenvironmental records of Carnian Pluvial Episode (Late Triassic) in southwestern Guizhou, China","authors":"Shi-Xin Li , Zhi-Heng Ma , Xi Zhang , Wei Yang , Jian-Li Zeng , Mihai Emilian Popa , Kai-Nan Mao , Ting-Shan Zhang","doi":"10.1016/j.palwor.2025.201008","DOIUrl":"10.1016/j.palwor.2025.201008","url":null,"abstract":"<div><div>The Carnian Pluvial Episode (CPE) in the Early Mesozoic was an extreme climate event that globally perturbed the Carbon cycle, significantly enhanced the hydrological cycle, and intensified ocean anoxia due to global warming, thereby exerting a significant influence on sedimentary environments. This study investigates the CPE in South China through integrated biostratigraphic, petrological, and geochemical analyses. Our findings of δ<sup>13</sup>C records reveal a progressive increase from 1.71‰ to 3.54‰ and 1.53‰ to 2.88‰ in the lower to middle Julian 1 substage, followed by a major negative excursion from 2.91‰ to 1.47‰ and 2.88‰ to 1.09‰ in the late Julian 1 at the Yongning and the Wusha sections respectively. The δ<sup>13</sup>C records from the two study sections generally correlate well with each other and are earlier than published records. Moreover, fluctuations observed in various redox proxies (U/Th, V/Cr, V/(V+Ni), Mo/Al) strongly coincide with δ<sup>13</sup>C excursions during the late Julian 1 substage, pointing the marine environment shift from oxic to dysoxic/anoxic condition. While the carbonate platforms are overlain by deep-water anoxic facies at the Yongning section. Sr and Ba levels revealed a significant freshwater influx during the CPE, leading to oscillating decreases in palaeosalinity within the study area. In addition, recorded data for Al, Zr, Hf, Ti and Th suggest that the intensified continental weathering, resulted from a humid climate during the CPE, increased the terrigenous clastic input.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201008"},"PeriodicalIF":1.7,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929162","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}
Pub Date : 2025-08-26DOI: 10.1016/j.palwor.2025.201005
Xin-Yi Zhang , Han-Ting Zhong , Xin Li , Hui Chen , Shan Ye , Ming-Cai Hou , Chao Ma
Due to the great abundance of microfossils even in a small sample, they are ideal specimens for machine learning, which needs sufficient sample size. Taking the taxonomic controversy in a certain radiolarian lineage as a case study, a quantitative and objective approach and its advantage to fossil taxonomy is discussed in this study. Unsupervised machine learning algorithms are used to determine the species of radiolarians based on their morphological characteristics. K-Means, Agglomerative Clustering, and Meanshift are applied to build clustering models, with the centroid-based K-Means algorithm providing the most accurate classification results at a 92.26% accuracy. This method improves the efficiency of fossil identification and presents an accurate and objective method for assessing controversies associated with traditional methods.
{"title":"Application of machine learning in radiolarian taxonomy: A case study on Early Cretaceous Turbocapsula lineage","authors":"Xin-Yi Zhang , Han-Ting Zhong , Xin Li , Hui Chen , Shan Ye , Ming-Cai Hou , Chao Ma","doi":"10.1016/j.palwor.2025.201005","DOIUrl":"10.1016/j.palwor.2025.201005","url":null,"abstract":"<div><div>Due to the great abundance of microfossils even in a small sample, they are ideal specimens for machine learning, which needs sufficient sample size. Taking the taxonomic controversy in a certain radiolarian lineage as a case study, a quantitative and objective approach and its advantage to fossil taxonomy is discussed in this study. Unsupervised machine learning algorithms are used to determine the species of radiolarians based on their morphological characteristics. K-Means, Agglomerative Clustering, and Meanshift are applied to build clustering models, with the centroid-based K-Means algorithm providing the most accurate classification results at a 92.26% accuracy. This method improves the efficiency of fossil identification and presents an accurate and objective method for assessing controversies associated with traditional methods.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201005"},"PeriodicalIF":1.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929159","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}
Pub Date : 2025-08-26DOI: 10.1016/j.palwor.2025.201006
Manuel Brazidec , Paolo Rosa
The Miocene history of the aculeate family Chrysididae is poorly known, with only two species described for that time interval. Here, a third species is introduced, the second from the rich middle Miocene Zhangpu amber, southeastern China. †Trichrysis perrichoti n. sp. is described and illustrated based on a nearly complete female specimen. The new species displays characters of the cyanea species group, which is today the most common for TrichrysisLichtenstein, 1876 in China. This discovery further strengthens the affinities between the Zhangpu entomofauna and the modern Southeast Asia entomofauna.
{"title":"A second cuckoo wasp species from the mid-Miocene Zhangpu biota (Hymenoptera: Chrysididae)","authors":"Manuel Brazidec , Paolo Rosa","doi":"10.1016/j.palwor.2025.201006","DOIUrl":"10.1016/j.palwor.2025.201006","url":null,"abstract":"<div><div>The Miocene history of the aculeate family Chrysididae is poorly known, with only two species described for that time interval. Here, a third species is introduced, the second from the rich middle Miocene Zhangpu amber, southeastern China. †<em>Trichrysis perrichoti</em> n. sp. is described and illustrated based on a nearly complete female specimen. The new species displays characters of the <em>cyanea</em> species group, which is today the most common for <em>Trichrysis</em> <span><span>Lichtenstein, 1876</span></span> in China. This discovery further strengthens the affinities between the Zhangpu entomofauna and the modern Southeast Asia entomofauna.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201006"},"PeriodicalIF":1.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929161","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}
Pub Date : 2025-08-06DOI: 10.1016/j.palwor.2025.201004
Dany Azar , Sibelle Maksoud
Xenophlebotomites eliei n. gen. n. sp. is characterized after a male and female individuals, illustrated, and described from the lower Barremian amber of Hammana/Mdeyrij, central Lebanon. It represents the first phlebotomine fly from Lebanese amber with an incomplete r1-r2+3 cross-vein without reaching R1, wing wide with round tip, and legs relatively short, slightly longer than body length. This phlebotomine has very developed piercing mouthparts and palps bearing Newstead’s sensilla assembled on the fourth palpomere suggesting haematophagous life-mode. The discovery of this Cretaceous psychodid fly constitutes the seventh phlebotomine discovered from the Lebanese amber and improves our knowledge of the palaeobiodiversity of sandflies during the Lower Cretaceous.
Xenophlebotomites eliei n. gen. n. sp.以雌雄个体为特征，在黎巴嫩中部Hammana/Mdeyrij的下巴雷米亚琥珀中进行了说明和描述。它是第一只来自黎巴嫩琥珀的白蛉，具有不完整的R1 -r2+3交叉静脉，未达到R1，翅膀宽，尖端圆，腿相对较短，略长于体长。这种白血鱼有非常发达的刺穿式口器和触须，在第四触须上装配有纽斯特德感受器，表明它的生活方式是噬血的。这种白垩纪精神病蝇的发现构成了从黎巴嫩琥珀中发现的第七种白蛉，并提高了我们对下白垩纪白蛉古生物多样性的认识。
{"title":"Xenophlebotomites eliei, a new genus and species of phlebotomine sandflies from Lower Cretaceous Lebanese amber (Diptera: Psychodidae: Phlebotominae)","authors":"Dany Azar , Sibelle Maksoud","doi":"10.1016/j.palwor.2025.201004","DOIUrl":"10.1016/j.palwor.2025.201004","url":null,"abstract":"<div><div><em>Xenophlebotomites eliei</em> n. gen. n. sp. is characterized after a male and female individuals, illustrated, and described from the lower Barremian amber of Hammana/Mdeyrij, central Lebanon. It represents the first phlebotomine fly from Lebanese amber with an incomplete r1-r2+3 cross-vein without reaching R1, wing wide with round tip, and legs relatively short, slightly longer than body length. This phlebotomine has very developed piercing mouthparts and palps bearing Newstead’s sensilla assembled on the fourth palpomere suggesting haematophagous life-mode. The discovery of this Cretaceous psychodid fly constitutes the seventh phlebotomine discovered from the Lebanese amber and improves our knowledge of the palaeobiodiversity of sandflies during the Lower Cretaceous.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 201004"},"PeriodicalIF":1.7,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418052","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}
Pub Date : 2025-08-05DOI: 10.1016/j.palwor.2025.201002
Ainul H. Ansari , Rajan Shukla , Avneet Kumar , Abu Talib
This study reports the Middle to Late Jurassic (Bajocian–Oxfordian) benthic foraminiferal assemblages from Kachchh, India, and assesses their significance as palaeoenvironmental proxies. Four distinct assemblages are identified to evaluate marine benthic foraminiferal groups along the inner-to-outer shelf gradient. From Bajocian to Oxfordian, four environmental fluctuation events were recognised. These fluctuations were examined in relation to bathymetry, organic matter (food availability), oxic and anoxic conditions, and species diversity. Except for the lower Callovian assemblages, the others exhibit favourable environments, ranging from moderately mesotrophic to eutrophic, middle to outer neritic (100–150 m), well-oxygenated conditions and specific diversities. The fluctuations may be due to the increased food influx (Bajocian–Callovian) and decreased dissolved oxygen in the bottom water (Callovian–Oxfordian). Fluctuations in dissolved oxygen and supply of organic matter were the primary environmental factors influencing the distribution pattern of benthic foraminiferal species in the Kachchh Basin. In shallow marine environments with well-oxygenated bottom waters, food availability and oxygen levels played a more decisive role in shaping assemblage structure than bathymetry. However, water depth exerted a greater influence on species distribution in deeper settings.
{"title":"Benthic foraminiferal assemblages from the Middle to Upper Jurassic rocks of the Kachchh Basin, India: Insights into taxonomy and palaeoenvironmental reconstruction","authors":"Ainul H. Ansari , Rajan Shukla , Avneet Kumar , Abu Talib","doi":"10.1016/j.palwor.2025.201002","DOIUrl":"10.1016/j.palwor.2025.201002","url":null,"abstract":"<div><div>This study reports the Middle to Late Jurassic (Bajocian–Oxfordian) benthic foraminiferal assemblages from Kachchh, India, and assesses their significance as palaeoenvironmental proxies. Four distinct assemblages are identified to evaluate marine benthic foraminiferal groups along the inner-to-outer shelf gradient. From Bajocian to Oxfordian, four environmental fluctuation events were recognised. These fluctuations were examined in relation to bathymetry, organic matter (food availability), oxic and anoxic conditions, and species diversity. Except for the lower Callovian assemblages, the others exhibit favourable environments, ranging from moderately mesotrophic to eutrophic, middle to outer neritic (100–150 m), well-oxygenated conditions and specific diversities. The fluctuations may be due to the increased food influx (Bajocian–Callovian) and decreased dissolved oxygen in the bottom water (Callovian–Oxfordian). Fluctuations in dissolved oxygen and supply of organic matter were the primary environmental factors influencing the distribution pattern of benthic foraminiferal species in the Kachchh Basin. In shallow marine environments with well-oxygenated bottom waters, food availability and oxygen levels played a more decisive role in shaping assemblage structure than bathymetry. However, water depth exerted a greater influence on species distribution in deeper settings.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201002"},"PeriodicalIF":1.7,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929164","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}
Pub Date : 2025-08-05DOI: 10.1016/j.palwor.2025.201003
Michael S. Engel
An enigmatic new family of minute (less than 1 mm in length) proctotrupomorphan wasps is described and figured from Lower Cretaceous Lebanese amber. Uroprionulidae n. fam. is established for the new genus and species, Uroprionulus zenobia n. gen. n. sp. from the Bcharreh District of Lebanon. The fossil is a female with an elongate ovipositor and sheaths and with wings superficially resembling those of several extinct families of minute Proctotrupomorpha, such as Alavarommatidae, Archaeoserphitidae, and Spathiopterygidae. The characters of the family are considered in the context of those for other lineages of Proctotrupomorpha and a tentative revised classification is outlined.
从下白垩纪黎巴嫩琥珀中描述和描绘了一种神秘的新小黄蜂（长度小于1毫米）。尿毒杆菌科；为来自黎巴嫩Bcharreh地区的新属和新种Uroprionulus zenobia n. gen. n. sp.建立。该化石为雌性，具有细长的产卵器和鞘，其翅膀表面类似于几个已灭绝的微小直翅虫科，如alavaromatidae， Archaeoserphitidae和Spathiopterygidae。这个家族的特征是在其他直系的背景下考虑的，并概述了一个暂定的修订分类。
{"title":"A new family of proctotrupomorphan wasps in Lower Cretaceous amber of Lebanon (Hymenoptera)","authors":"Michael S. Engel","doi":"10.1016/j.palwor.2025.201003","DOIUrl":"10.1016/j.palwor.2025.201003","url":null,"abstract":"<div><div>An enigmatic new family of minute (less than 1 mm in length) proctotrupomorphan wasps is described and figured from Lower Cretaceous Lebanese amber. Uroprionulidae n. fam. is established for the new genus and species, <em>Uroprionulus zenobia</em> n. gen. n. sp. from the Bcharreh District of Lebanon. The fossil is a female with an elongate ovipositor and sheaths and with wings superficially resembling those of several extinct families of minute Proctotrupomorpha, such as Alavarommatidae, Archaeoserphitidae, and Spathiopterygidae. The characters of the family are considered in the context of those for other lineages of Proctotrupomorpha and a tentative revised classification is outlined.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 201003"},"PeriodicalIF":1.7,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418043","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}
Pub Date : 2025-07-31DOI: 10.1016/j.palwor.2025.201001
Nikita Bragin, Liubov Bragina
A well-preserved radiolarian assemblage was studied from the Upper Jurassic of the Domodedovo quarry, Moscow Region, Central Russia. Radiolarians were found within the Ermolino Formation (upper Oxfordian to lower Kimmeridgian), in phosphatic concretions. The radiolarian assemblage is represented by 29 species of 13 genera and has a boreal affinity with some southern influence indicated by the presence of Pantanellium. The assemblage is characterized by the abundance of Praeconocaryomma, common presence of Praeparvicingula, and rare presence of Phantum, Acanthocircus, Pantanellium and Nordvikella. Four new species are described: Acastea laevispina n. sp., Praeconocaryomma blomei n. sp., Phantum robustum n. sp., Nordvikella simplex n. sp.
对俄罗斯中部莫斯科州多莫杰多沃采石场上侏罗世保存完好的放射虫组合进行了研究。放射虫在Ermolino组（上牛津纪至下基默里吉纪）中被发现，在磷酸盐结合体中。放射虫组合由13属29种代表，具有北方亲缘关系，并有一些南方的影响，这是由Pantanellium的存在表明的。该组合的特点是丰富的praeconcaromma，常见的Praeparvicingula，罕见的Phantum， Acanthocircus， panantellium和Nordvikella。本文报道了4个新种：Acastea laevispina n. sp, preeconcaromma blomei n. sp, Phantum robustum n. sp, Nordvikella simplex n. sp。
{"title":"Radiolarians from the upper Oxfordian to lower Kimmeridgian (Upper Jurassic) Domodedovo Section, Moscow Region, Central Russia","authors":"Nikita Bragin, Liubov Bragina","doi":"10.1016/j.palwor.2025.201001","DOIUrl":"10.1016/j.palwor.2025.201001","url":null,"abstract":"<div><div>A well-preserved radiolarian assemblage was studied from the Upper Jurassic of the Domodedovo quarry, Moscow Region, Central Russia. Radiolarians were found within the Ermolino Formation (upper Oxfordian to lower Kimmeridgian), in phosphatic concretions. The radiolarian assemblage is represented by 29 species of 13 genera and has a boreal affinity with some southern influence indicated by the presence of <em>Pantanellium</em>. The assemblage is characterized by the abundance of <em>Praeconocaryomma</em>, common presence of <em>Praeparvicingula</em>, and rare presence of <em>Phantum</em>, <em>Acanthocircus</em>, <em>Pantanellium</em> and <em>Nordvikella</em>. Four new species are described: <em>Acastea laevispina</em> n. sp., <em>Praeconocaryomma blomei</em> n. sp., <em>Phantum robustum</em> n. sp., <em>Nordvikella simplex</em> n. sp.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 201001"},"PeriodicalIF":1.7,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929163","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}
Pub Date : 2025-07-31DOI: 10.1016/j.palwor.2025.200998
Lu-Da Xing , Xiao-Bing Wang , Martin Pickford , Yan-Jie Chen , Jiao Ma , Shu-Qiong Wang , Yi-Yang Liu , Shi-Qi Wang
Pliohyracidae, a group of large-bodied hyracoids, successfully colonised Eurasia during the late Cenozoic. However, their cranial morphology has remained poorly understood due to the scarcity of complete specimens in East Asia, particularly for Postschizotherium. This study presents the first nearly complete cranium of Postschizotherium cf. intermedium from the Early Pleistocene Longdan locality in Gansu Province, China. The cranium exhibits several distinctive features, including an exceptionally laterally projecting orbit, a massive maxillary sinus that significantly invades the orbital fossa, and a highly developed pre-orbital fossa system. These morphological traits, especially the first one, suggest that Postschizotherium is closely related to Pliohyrax and Kvabebihyrax, both being large pliohyracids from the upper Cenozoic of East Europe and West Asia. The morphology also suggests that Postschizotherium likely occupied semi-aquatic habitats, similar to those of extant hippos, with a diet primarily consisting of grasses. The discovery of this species at Longdan also provides evidence for a relatively humid palaeoenvironment in the region during the earliest Pleistocene, contributing to our understanding of the palaeoenvironmental conditions and evolutionary history of pliohyracids in Eurasia.
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