Review of Palaeobotany and Palynology最新文献

The pulse of ancient fires: Reconstructing Toarcian wildfire regimes from fossil charcoals in northwest China 古代火种的脉动：从中国西北地区的化石木炭中重建托尔西亚野火制度

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-28 DOI: 10.1016/j.revpalbo.2026.105519

Yuling Na , Xiao Shi , Chi Tian , Wenpei Pei , Qianqian Song , Shaoting Tian , Bing Wang , Yan Liu , Leon Nahuel Torres , Jianxin Yu

Understanding the occurrence and ecological impacts of paleo-wildfires is essential for reconstructing paleoclimate conditions and ecosystem evolution. This study focuses on fossil charcoals from the Sangonghe Formation in the HD1 well of the Hoxtolgay Basin, northern Xinjiang, China. According to the Scanning Electron Microscope (SEM) microscopic characteristics, the charcoal assemblage from the Sangonghe Formation comprises Agathoxylon, Protocupressinoxylon, Protophyllocladoxylon, Protosciadopityoxylon, and gymnosperms incertae sedis. Macro-charcoals are primarily in situ or near in situ, indicating frequent low-intensity local surface fires with temperatures ranging from 282.91 °C to 591.37 °C, mostly concentrated between 300 and 500 °C. The abundance of charcoals and paleo-wildfire temperatures show significant vertical variations, with more active, higher-temperature wildfire activities, and more obvious fire temperature fluctuations in the 523.8–673.6 m interval, possibly related to global surge in wildfires and climatic aridification during the initiation of the Toarcian Oceanic Anoxic Event (T-OAE). The charcoal records from the Sangonghe Formation constrain the atmospheric oxygen concentration to no less than 15% during the late Early Jurassic. Based on the paleo-wildfires reflected by charcoals and palynological characteristics, the climate in the Hoxtolgay Basin during the late Early Jurassic was predominantly warm and humid, probably with intermittent aridity. The sedimentary process of the Sangonghe Formation may have experienced a transition from arid to humid conditions. The present study reports the first systematic taxonomic analysis of the late Early Jurassic charcoals in northern Xinjiang, providing crucial evidence for reconstructing paleo-wildfire dynamics and exploring the coupling mechanisms of wildfires, climate, and ecosystems in geological history.

了解古山火的发生和生态影响对重建古气候条件和生态系统演化具有重要意义。以新疆北部霍克斯托勒盖盆地HD1井三工河组为研究对象。扫描电镜（SEM）特征表明，三工河组木炭组合由Agathoxylon、Protocupressinoxylon、Protophyllocladoxylon、Protosciadopityoxylon和裸子植物incertae sedis组成。宏观木炭主要在原位或近原位，表明频繁发生低强度的局部地表火灾，温度范围为282.91 ~ 591.37℃，主要集中在300 ~ 500℃之间。在523.8 ~ 673.6 m区间，野火活动更加活跃、温度更高，火灾温度波动更为明显，这可能与Toarcian Oceanic Anoxic Event （T-OAE）启动期间全球野火激增和气候干旱化有关。早侏罗世晚期三工河组的木炭记录限制了大气氧浓度不低于15%。根据炭素和孢粉特征反映的古野火特征，早侏罗世晚期霍克斯托尔盖盆地气候以温暖湿润为主，可能存在间歇性干旱。三工河组的沉积过程可能经历了从干旱到湿润的过渡过程。本文首次对新疆北部早侏罗世晚期木炭进行了系统的分类分析，为重建古野火动态，探索地质历史上野火与气候、生态系统的耦合机制提供了重要依据。

{"title":"The pulse of ancient fires: Reconstructing Toarcian wildfire regimes from fossil charcoals in northwest China","authors":"Yuling Na , Xiao Shi , Chi Tian , Wenpei Pei , Qianqian Song , Shaoting Tian , Bing Wang , Yan Liu , Leon Nahuel Torres , Jianxin Yu","doi":"10.1016/j.revpalbo.2026.105519","DOIUrl":"10.1016/j.revpalbo.2026.105519","url":null,"abstract":"<div><div>Understanding the occurrence and ecological impacts of paleo-wildfires is essential for reconstructing paleoclimate conditions and ecosystem evolution. This study focuses on fossil charcoals from the Sangonghe Formation in the HD1 well of the Hoxtolgay Basin, northern Xinjiang, China. According to the Scanning Electron Microscope (SEM) microscopic characteristics, the charcoal assemblage from the Sangonghe Formation comprises <em>Agathoxylon</em>, <em>Protocupressinoxylon</em>, <em>Protophyllocladoxylon</em>, <em>Protosciadopityoxylon</em>, and gymnosperms incertae sedis. Macro-charcoals are primarily in situ or near in situ, indicating frequent low-intensity local surface fires with temperatures ranging from 282.91 °C to 591.37 °C, mostly concentrated between 300 and 500 °C. The abundance of charcoals and paleo-wildfire temperatures show significant vertical variations, with more active, higher-temperature wildfire activities, and more obvious fire temperature fluctuations in the 523.8–673.6 m interval, possibly related to global surge in wildfires and climatic aridification during the initiation of the Toarcian Oceanic Anoxic Event (T-OAE). The charcoal records from the Sangonghe Formation constrain the atmospheric oxygen concentration to no less than 15% during the late Early Jurassic. Based on the paleo-wildfires reflected by charcoals and palynological characteristics, the climate in the Hoxtolgay Basin during the late Early Jurassic was predominantly warm and humid, probably with intermittent aridity. The sedimentary process of the Sangonghe Formation may have experienced a transition from arid to humid conditions. The present study reports the first systematic taxonomic analysis of the late Early Jurassic charcoals in northern Xinjiang, providing crucial evidence for reconstructing paleo-wildfire dynamics and exploring the coupling mechanisms of wildfires, climate, and ecosystems in geological history.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"348 ","pages":"Article 105519"},"PeriodicalIF":1.7,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081611","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

Evidence for Early Middle Jurassic wildfires: New macro-charcoal records from the Xishanyao Formation, Junggar Basin, Northern Xinjiang, China 早中侏罗统野火的证据：新疆北部准噶尔盆地西山窑组宏观炭新记录

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-27 DOI: 10.1016/j.revpalbo.2026.105518

Bing Yang , Yuling Na , Xiao Shi , Yi Wei , Xinzhi Zhang , Bing Wang , Siyuan Sun , Weitong Li

Wildfires, as an integral part of the Earth system, profoundly influence climate, vegetation, and biogeochemical cycles, shaping global ecological and climatic dynamics. In this study, we systematically analyzed charcoal fossils from the Middle Jurassic Xishanyao Formation in the Junggar Basin using taxonomic classification and reflectance measurements. Our analysis suggests frequent, low-temperature (318–493 °C) and low-intensity surface fires, with the preserved charcoal indicating contributions from Protophyllocaldoxylon-like gymnosperm wood as well as other taxonomically indeterminate gymnosperm fragments. The presence of abundant, large macro-charcoal fragments provides high-fidelity evidence of local wildfire activity, indicating a warm and humid subtropical climate conducive to biomass accumulation that was probably punctuated by intermittent dry intervals. High atmospheric oxygen levels (> 15%, potentially up to 28.3%) and lightning strikes are considered the primary drivers that facilitated combustion. This research provides important new evidence from the Xishanyao Formation to further refine the reconstruction of paleo-climate and wildfire activity during the Middle Jurassic and offers key insights into the terrestrial ecosystem evolution of Northwest China during this period.

野火作为地球系统的组成部分，深刻影响着气候、植被和生物地球化学循环，塑造着全球生态和气候动态。本文对准噶尔盆地中侏罗统西山窑组木炭化石进行了系统的分类和反射率测量。我们的分析表明，频繁的低温（318-493°C）和低强度的地表火灾，保存的木炭表明来自protophyllocaldoxylon样裸子植物木材以及其他分类上不确定的裸子植物碎片。大量大型木炭碎片的存在为当地野火活动提供了高保真度的证据，表明温暖湿润的亚热带气候有利于生物质积累，可能被间歇性干燥间隔打断。高大气含氧量（15%，可能高达28.3%）和雷击被认为是促进燃烧的主要驱动因素。该研究为进一步完善中侏罗统古气候和野火活动的重建提供了重要的新证据，并为该时期中国西北陆地生态系统的演化提供了重要的认识。

{"title":"Evidence for Early Middle Jurassic wildfires: New macro-charcoal records from the Xishanyao Formation, Junggar Basin, Northern Xinjiang, China","authors":"Bing Yang , Yuling Na , Xiao Shi , Yi Wei , Xinzhi Zhang , Bing Wang , Siyuan Sun , Weitong Li","doi":"10.1016/j.revpalbo.2026.105518","DOIUrl":"10.1016/j.revpalbo.2026.105518","url":null,"abstract":"<div><div>Wildfires, as an integral part of the Earth system, profoundly influence climate, vegetation, and biogeochemical cycles, shaping global ecological and climatic dynamics. In this study, we systematically analyzed charcoal fossils from the Middle Jurassic Xishanyao Formation in the Junggar Basin using taxonomic classification and reflectance measurements. Our analysis suggests frequent, low-temperature (318–493 °C) and low-intensity surface fires, with the preserved charcoal indicating contributions from <em>Protophyllocaldoxylon</em>-like gymnosperm wood as well as other taxonomically indeterminate gymnosperm fragments. The presence of abundant, large macro-charcoal fragments provides high-fidelity evidence of local wildfire activity, indicating a warm and humid subtropical climate conducive to biomass accumulation that was probably punctuated by intermittent dry intervals. High atmospheric oxygen levels (>15%, potentially up to 28.3%) and lightning strikes are considered the primary drivers that facilitated combustion. This research provides important new evidence from the Xishanyao Formation to further refine the reconstruction of paleo-climate and wildfire activity during the Middle Jurassic and offers key insights into the terrestrial ecosystem evolution of Northwest China during this period.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"348 ","pages":"Article 105518"},"PeriodicalIF":1.7,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081610","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

Cuticular evidence and taxonomic reassessment of Miocene Albizia fossils in southwest China: Implications for the biogeography of A. julibrissin 中国西南地区中新世Albizia化石的表皮证据和分类重新评估：对A. juliissin的生物地理学意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-27 DOI: 10.1016/j.revpalbo.2026.105517

Ping Lu, Jin-Bo Gao, De-Liang Li, Xiao-Qing Liang

Albizia julibrissin, native to Asia, has been widely introduced to and cultivated in both America and Europe. Well-preserved fossil leaflets recovered from late Miocene deposits in Huaning, southwest China, exhibit distinctive characteristics consistent with those of extant A. julibrissin. These include: (1) falcate or oblong leaflets with the midvein positioned adjacent to the upper margin, (2) distinctive trichome bases on the lower epidermis, (3) straight to moderately undulate anticlinal cell walls, and (4) anomocytic stomatal complexes. However, because of the smaller size of the epidermal cells observed in the fossil leaflets, these specimens have been reclassified as Albizia cf. julibrissin Durazz. These fossils show that ancestors of A. julibrissin were already present in southwest China during or before the warm late Miocene. During the late Neogene, A. julibrissin spread widely despite prevailing global cooling trends. In contrast, contemporary climate projections suggest that a warming of 1.5 °C by 2100 could lead to a substantial contraction of the suitable range for this warm-adapted Miocene species in the coming decades. This reduction is expected to occur despite efforts in artificial cultivation and human-assisted dispersal.

合欢，原产于亚洲，已被广泛引进和栽培在美洲和欧洲。在中国西南华宁晚中新世沉积物中发现的保存完好的化石小叶，显示出与现存A. juliissin一致的独特特征。这些特征包括：(1)镰状或长圆形小叶，中脉位于靠近上缘的位置；(2)独特的毛状基部位于下表皮；(3)直至中等起伏的背斜细胞壁；(4)不规则的气孔复合体。然而，由于在化石小叶中观察到的表皮细胞较小，这些标本已被重新分类为Albizia cf. julibrissin Durazz。这些化石表明，在温暖的晚中新世或之前，金合欢的祖先已经出现在中国西南部。在新第三纪晚期，尽管全球普遍降温趋势，合欢草仍广泛传播。相比之下，当代气候预测表明，到2100年升温1.5°C可能导致未来几十年这种适应温暖的中新世物种的适宜范围大幅缩小。尽管进行了人工养殖和人类辅助扩散的努力，预计仍会出现这种减少。

{"title":"Cuticular evidence and taxonomic reassessment of Miocene Albizia fossils in southwest China: Implications for the biogeography of A. julibrissin","authors":"Ping Lu, Jin-Bo Gao, De-Liang Li, Xiao-Qing Liang","doi":"10.1016/j.revpalbo.2026.105517","DOIUrl":"10.1016/j.revpalbo.2026.105517","url":null,"abstract":"<div><div><em>Albizia julibrissin</em>, native to Asia, has been widely introduced to and cultivated in both America and Europe. Well-preserved fossil leaflets recovered from late Miocene deposits in Huaning, southwest China, exhibit distinctive characteristics consistent with those of extant <em>A. julibrissin.</em> These include: (1) falcate or oblong leaflets with the midvein positioned adjacent to the upper margin, (2) distinctive trichome bases on the lower epidermis, (3) straight to moderately undulate anticlinal cell walls, and (4) anomocytic stomatal complexes. However, because of the smaller size of the epidermal cells observed in the fossil leaflets, these specimens have been reclassified as <em>Albizia</em> cf. <em>julibrissin</em> Durazz. These fossils show that ancestors of <em>A. julibrissin</em> were already present in southwest China during or before the warm late Miocene. During the late Neogene, <em>A. julibrissin</em> spread widely despite prevailing global cooling trends. In contrast, contemporary climate projections suggest that a warming of 1.5 °C by 2100 could lead to a substantial contraction of the suitable range for this warm-adapted Miocene species in the coming decades. This reduction is expected to occur despite efforts in artificial cultivation and human-assisted dispersal.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"348 ","pages":"Article 105517"},"PeriodicalIF":1.7,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081609","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 Pterophyllum crassinervum (Bennettitales) from the Rhaetian of South China and its palaeoecological implications 中国南方雷提亚地区蕨类植物（terophyllum crassinervum）的再调查及其古生态学意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-23 DOI: 10.1016/j.revpalbo.2026.105516

Yuanyuan Xu , Ning Lu , Liqin Li , Yongdong Wang

Pterophyllum Brongniart 1825 is one of the most abundant morphogenus of bennettitalean foliage with at least 157 species documented in China. Among the numerous Pterophyllum species, P. crassinervum Huang et Chow was originally established solely based on insufficiently macromorphological features with limited fossil records. Here, we re-investigate this species for detailed descriptions and interspecific comparisons, and firstly show its epidermal structure based on new fossil collections from the Rhaetian of Upper Triassic strata in the northeastern Sichuan Basin, South China. The thoroughly re-examination of Pterophyllum crassinervum confirms its taxonomic validity and define the standard criteria for distinctive segregation of this species from its analogues. A neotype and an emended specific diagnosis with supplementary microstructures of Pterophyllum crassinervum are formally proposed. Based on a comprehensive interspecific comparison of Pterophyllum species, we confirm that the occurrence of mucronate teeth on pinnae apices is a rare character among this plant group. Considering the predominant position of Bennettitales (especially Pterophyllum) and active herbivories (especially marginal/apical feeding) during the latest Triassic in northeastern Sichuan Basin, the appearance of mucronate teeth may represents the plant-insect co-evolutionary results.

蕨类植物（Pterophyllum Brongniart 1825）是中国有记录的蕨类植物中最丰富的形态属之一，至少有157种。在众多的蕨类植物中，P. crassinervum Huang et Chow最初仅仅是基于不充分的大形态特征和有限的化石记录而建立的。本文基于四川盆地东北部上三叠统雷提亚地层的新化石，对该物种进行了详细的描述和种间比较，并首次揭示了其表皮结构。对蕨类植物的重新研究证实了其分类学的有效性，并确定了该物种与同类植物分离的标准标准。本文正式提出了一种新类型和一种带有补充显微结构的修正特异诊断。在对蕨类植物种间比较的基础上，我们证实在蕨类植物中，羽尖上出现短尖齿是一种罕见的特征。考虑到川东北地区晚三叠纪贝类（尤其是蕨类）和活跃的食草类（尤其是边缘/顶端摄食）的优势地位，短齿齿的出现可能代表了植物-昆虫共同进化的结果。

{"title":"Re-investigation of Pterophyllum crassinervum (Bennettitales) from the Rhaetian of South China and its palaeoecological implications","authors":"Yuanyuan Xu , Ning Lu , Liqin Li , Yongdong Wang","doi":"10.1016/j.revpalbo.2026.105516","DOIUrl":"10.1016/j.revpalbo.2026.105516","url":null,"abstract":"<div><div><em>Pterophyllum</em> Brongniart 1825 is one of the most abundant morphogenus of bennettitalean foliage with at least 157 species documented in China. Among the numerous <em>Pterophyllum</em> species, <em>P. crassinervum</em> Huang et Chow was originally established solely based on insufficiently macromorphological features with limited fossil records. Here, we re-investigate this species for detailed descriptions and interspecific comparisons, and firstly show its epidermal structure based on new fossil collections from the Rhaetian of Upper Triassic strata in the northeastern Sichuan Basin, South China. The thoroughly re-examination of <em>Pterophyllum crassinervum</em> confirms its taxonomic validity and define the standard criteria for distinctive segregation of this species from its analogues. A neotype and an emended specific diagnosis with supplementary microstructures of <em>Pterophyllum crassinervum</em> are formally proposed. Based on a comprehensive interspecific comparison of <em>Pterophyllum</em> species, we confirm that the occurrence of mucronate teeth on pinnae apices is a rare character among this plant group. Considering the predominant position of Bennettitales (especially <em>Pterophyllum</em>) and active herbivories (especially marginal/apical feeding) during the latest Triassic in northeastern Sichuan Basin, the appearance of mucronate teeth may represents the plant-insect co-evolutionary results.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"348 ","pages":"Article 105516"},"PeriodicalIF":1.7,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071136","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

Pliocene humid subtropical climate in Central Yunnan (SW China) and the anthropogenic warming-driven extinction threat to Nyssa species 滇中上新世湿润亚热带气候及人为变暖对沙蚕物种的灭绝威胁

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-22 DOI: 10.1016/j.revpalbo.2026.105514

Ping Lu , Jian-Wei Zhang , De-Liang Li , Xiao-Qing Liang

Persistent anthropogenic climate warming is one of the major drivers behind the large-scale extinction of species. To investigate the extinction mechanisms of plant taxa originating from warm and humid geological periods under contemporary climate warming, this study utilized endocarp (fruit pits) fossils of Nyssa sibirica P. I. Dorof. ex Zhilin discovered in southwestern China, combined with fossil records and current distribution data of the genus, and employed ecological niche modeling to systematically reconstruct the historical distribution patterns and future potential distribution areas of the Nyssa genus. The research indicated that the presence of Nyssa sibirica (closely related to the endemic North American southeastern species N. sylvatica and N. biflora) in central Yunnan suggested that the region experienced a humid subtropical climate during the Pliocene. Phytogeographical evidence further revealed that Nyssa species (including N. sibirica) originated in warm and humid environments millions of years ago. However, due to their limited adaptability to global climate cooling, their distribution ranges gradually contracted southward during the Neogene. Additionally, simulations using the BioClim model showed that even under a scenario where global temperatures rise by no more than 1.5 °C compared to pre-industrial levels, the distribution ranges of extant Nyssa species have not expanded but have instead generally undergone significant reduction, with some species (such as N. sinensis and N. talamancana) even facing the risk of extinction. Therefore, strict adherence to the temperature control targets of the Paris Agreement is a critical measure for protecting these ancient plant taxa.

持续的人为气候变暖是导致物种大规模灭绝的主要原因之一。为了探讨在当代气候变暖背景下起源于温暖湿润地质时期的植物类群的灭绝机制，本研究利用了Nyssa sibirica p.i. Dorof的内果皮（果核）化石。结合化石记录和现有分布资料，采用生态位建模方法，系统地重建了Nyssa属的历史分布格局和未来潜在分布区域。研究表明，云南中部地区存在与北美东南部特有物种N. sylvatica和N. biflora密切相关的Nyssa sibirica，表明该地区在上新世经历了湿润的亚热带气候。植物地理学证据进一步表明，Nyssa物种（包括Nyssa sibirica）起源于数百万年前温暖湿润的环境。但由于对全球气候变冷的适应能力有限，其分布范围在新近纪逐渐向南收缩。此外，利用BioClim模型进行的模拟表明，即使在全球气温与工业化前相比上升不超过1.5°C的情况下，现存Nyssa物种的分布范围也没有扩大，而是普遍显著减少，其中一些物种（如N. sinensis和N. talamancana）甚至面临灭绝的风险。因此，严格遵守《巴黎协定》的温控目标是保护这些古老植物类群的关键措施。

{"title":"Pliocene humid subtropical climate in Central Yunnan (SW China) and the anthropogenic warming-driven extinction threat to Nyssa species","authors":"Ping Lu , Jian-Wei Zhang , De-Liang Li , Xiao-Qing Liang","doi":"10.1016/j.revpalbo.2026.105514","DOIUrl":"10.1016/j.revpalbo.2026.105514","url":null,"abstract":"<div><div>Persistent anthropogenic climate warming is one of the major drivers behind the large-scale extinction of species. To investigate the extinction mechanisms of plant taxa originating from warm and humid geological periods under contemporary climate warming, this study utilized endocarp (fruit pits) fossils of <em>Nyssa sibirica</em> P. I. Dorof. ex Zhilin discovered in southwestern China, combined with fossil records and current distribution data of the genus, and employed ecological niche modeling to systematically reconstruct the historical distribution patterns and future potential distribution areas of the <em>Nyssa</em> genus. The research indicated that the presence of <em>Nyssa sibirica</em> (closely related to the endemic North American southeastern species <em>N. sylvatica</em> and <em>N. biflora</em>) in central Yunnan suggested that the region experienced a humid subtropical climate during the Pliocene. Phytogeographical evidence further revealed that <em>Nyssa</em> species (including <em>N. sibirica</em>) originated in warm and humid environments millions of years ago. However, due to their limited adaptability to global climate cooling, their distribution ranges gradually contracted southward during the Neogene. Additionally, simulations using the BioClim model showed that even under a scenario where global temperatures rise by no more than 1.5 °C compared to pre-industrial levels, the distribution ranges of extant <em>Nyssa</em> species have not expanded but have instead generally undergone significant reduction, with some species (such as <em>N. sinensis</em> and <em>N</em>. <em>talamancana</em>) even facing the risk of extinction. Therefore, strict adherence to the temperature control targets of the Paris Agreement is a critical measure for protecting these ancient plant taxa.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"347 ","pages":"Article 105514"},"PeriodicalIF":1.7,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079204","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 biostratigraphy and biogeography of Middle Jurassic (late Bajocian to Bathonian) dinoflagellate cysts from the Barents Sea 巴伦支海中侏罗统（巴约世晚期至巴托世）鞭毛藻囊的生物地层学和生物地理学

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-21 DOI: 10.1016/j.revpalbo.2026.105515

Morten Smelror

The Barents Sea region was an important pathway for Jurassic-Cretaceous marine microplankton and faunal migration and is a key area for high-resolution bio- and sequence-stratigraphic correlations within the Panboreal Superrealm. New records of Late Bajocian-Bathonian dinoflagellate cysts assemblages in ammonite zone correlated strata in the Central Barents Sea are compared with contemporaneous assemblages from Central Europe and diachronic first and last appearances are noted. Species diversities areas are generally low, and calculated diversities and similarity-indexes between the Barents Sea dinoflagellate cyst assemblages and contemporaneous assemblages in Canadian Arctic, East Greenland, NW and Central Europe, Iran, Morrocco and Australia indicate limited biogeographic connections in Late Bajocian-Early Bathonian times compared to in Late Bathonian to Early Oxfordian times. The Late Bajocian- mid Bathonian biogeographic differences, and the following Late Bathonian-Early Oxfordian increase in similarities among world-wide dinoflagellate cyst assemblages, coincide with breakdowns of land-barriers, major transgressions, radiation of cyst-producing dinoflagellates and migration of marine biotas between Boreal, Sub-Boreal and Tethyan seas.

巴伦支海地区是侏罗纪-白垩纪海洋浮游生物和动物迁徙的重要通道，也是泛北方超领域高分辨率生物和层序地层对比的关键区域。本文将巴伦支海中部菊石带相关地层中晚巴约世—巴深世鞭毛藻囊组合的新记录与同期中欧的组合进行了比较，并指出了前后的历时性。物种多样性区域普遍较低，巴伦支海鞭毛藻囊组合与加拿大北极、东格陵兰、西北和中欧、伊朗、摩洛哥和澳大利亚同时期组合的计算多样性和相似性指数表明，与晚巴若世-早Bathonian相比，晚Bathonian -早牛津时代的生物地理联系有限。巴约世晚期-巴托世中期的生物地理差异，以及随后的巴托世晚期-牛津世早期世界范围内鞭毛藻包囊组合相似性的增加，与陆地屏障的破坏、主要海侵、产生包囊的鞭毛藻的辐射以及海洋生物在北方海、亚北方海和特提斯海之间的迁移相吻合。

{"title":"The biostratigraphy and biogeography of Middle Jurassic (late Bajocian to Bathonian) dinoflagellate cysts from the Barents Sea","authors":"Morten Smelror","doi":"10.1016/j.revpalbo.2026.105515","DOIUrl":"10.1016/j.revpalbo.2026.105515","url":null,"abstract":"<div><div>The Barents Sea region was an important pathway for Jurassic-Cretaceous marine microplankton and faunal migration and is a key area for high-resolution bio- and sequence-stratigraphic correlations within the Panboreal Superrealm. New records of Late Bajocian-Bathonian dinoflagellate cysts assemblages in ammonite zone correlated strata in the Central Barents Sea are compared with contemporaneous assemblages from Central Europe and diachronic first and last appearances are noted. Species diversities areas are generally low, and calculated diversities and similarity-indexes between the Barents Sea dinoflagellate cyst assemblages and contemporaneous assemblages in Canadian Arctic, East Greenland, NW and Central Europe, Iran, Morrocco and Australia indicate limited biogeographic connections in Late Bajocian-Early Bathonian times compared to in Late Bathonian to Early Oxfordian times. The Late Bajocian- mid Bathonian biogeographic differences, and the following Late Bathonian-Early Oxfordian increase in similarities among world-wide dinoflagellate cyst assemblages, coincide with breakdowns of land-barriers, major transgressions, radiation of cyst-producing dinoflagellates and migration of marine biotas between Boreal, Sub-Boreal and Tethyan seas.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"347 ","pages":"Article 105515"},"PeriodicalIF":1.7,"publicationDate":"2026-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079205","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

Oligocene coniferous woods of the Petroșani Basin, South Carpathians, Romania 罗马尼亚南喀尔巴阡山脉Petroșani盆地的渐新世针叶林

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-17 DOI: 10.1016/j.revpalbo.2026.105512

Alexandru Gabriel Călin, Mihai Emilian Popa, Roxana Pirnea

The Petroșani Basin of the South Carpathians, Romania, yields frequent permineralized wood material confined to the Chattian, coal bearing Dâlja-Uricani Formation. This study represents the first comprehensive taxonomic and systematic investigation of the basin's permineralized flora, in the larger area of the South Carpathians which until now remained largely unstudied for Oligocene woods. The newly collected material belongs to Family Cupressaceae sensu lato and is assigned to two genera: Taxodioxylon and Glyptostroboxylon, with four species: Taxodioxylon germanicum (Greguss) Van der Burgh, T. taxodii Gothan, T. gypsaceum (Göppert) Kräusel, and Glyptostroboxylon rudolphii Dolezych et Van der Burgh. The assemblage represents primary coal generators of a conifer dominated swamp vegetation that developed under a warm-temperate, humid climate in Petroșani Basin during the Late Oligocene.

Petroșani南喀尔巴阡山脉盆地，罗马尼亚，生产频繁的过矿化木材材料仅限于茶田，含煤的d lja- uricani组。这项研究代表了对盆地过矿化植物群的第一次全面的分类和系统的调查，在南喀尔巴阡山脉的更大范围内，直到现在还没有对渐新世森林进行研究。新收集的材料属于柏科sensu lato，分属Taxodioxylon和Glyptostroboxylon 2属，有Taxodioxylon germanicum (Greguss) Van der Burgh、t.t taxodii Gothan、t.g ypsaceum (Göppert) Kräusel和Glyptostroboxylon rudolphii Dolezych et Van der Burgh 4种。该组合代表了晚渐新世Petroșani盆地暖温带湿润气候下以针叶树为主的沼泽植被的初级产煤装置。

引用次数: 0

Modern palynological assemblages from nearby Mediterranean coastal lagoons: implications for palaeoecological interpretation 来自地中海沿岸泻湖的现代孢粉组合：古生态学解释的含义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-12 DOI: 10.1016/j.revpalbo.2026.105502

Federica Badino , Adele Bertini , Matteo Pili , Rossano Ciampalini , Davide Baroni , Giacomo Querci , Cècile Vittori , Jean-Philippe Goiran

Site-specific modern pollen assemblages are essential for interpreting fossil records, yet their links to local conditions and surrounding landscapes are often poorly understood. This study presents a modern palynological dataset from subsurface sediments of the shallow Burano and Orbetello lagoons in Tuscany, Italy. This dataset is part of a broader project which includes fossil sediment cores from the same basins. Spatially distributed samples were analyzed for grain-size, pollen, non-pollen palynomorphs, and sieved charcoal, with water physico-chemical parameters measured at each site. Terrestrial pollen assemblages mainly reflect regional wind-pollinated vegetation but show strong distortions, with forests overrepresented and open areas—especially cereal crops and vineyards—underrepresented. Modern calibration of Pinus and Olea pollen registrations is particularly informative given their key role in local human-driven landscape change. Sieved charcoal (> 125 μm), a proxy for local fire, is unevenly distributed and correlated with Glomus chlamydospores, indicating additional transport via runoff. At Burano, intra-basin pollen deposition is largely controlled by morphometric and sedimentological factors which explain 58.1% of the observed variance. In contrast, at the Orbetello lagoon, these factors explain only 26.7% of the variance, reflecting more complex hydrodynamic controls on sediment and pollen redistribution. Among aquatic groups, brackish macrophytes dominate across broad salinity ranges, primarily controlled by water depth, salinity, and associated with dissolved oxygen. Microalgal groups respond to temperature and nutrient availability, with high concentrations of harmful algae (Alexandrium spp.) indicating ecological stress. Overall, this modern spatial dataset provides a site-specific framework for interpreting fossil records and reconstructing past environmental changes. It also demonstrates the potential of combining palaeoecological research with modern data to translate scientific knowledge into practical applications for biodiversity conservation.

特定地点的现代花粉组合对于解释化石记录至关重要，但它们与当地条件和周围景观的联系往往知之甚少。本研究提出了一个来自意大利托斯卡纳浅层Burano和Orbetello泻湖地下沉积物的现代孢粉学数据集。该数据集是一个更广泛的项目的一部分，该项目包括来自同一盆地的化石沉积物岩心。分析了空间分布样品的粒度、花粉、非花粉形态和筛过的木炭，并在每个站点测量了水的物理化学参数。陆生花粉组合主要反映区域风媒传粉植被，但表现出强烈的扭曲，森林代表性过高，开阔地区（尤其是谷类作物和葡萄园）代表性不足。考虑到松树和油橄榄花粉在当地人为驱动的景观变化中的关键作用，现代校准的信息尤其丰富。筛过的木炭（> 125 μm）是当地火灾的代表，其分布不均匀，与球囊菌（Glomus chlamydo孢子）相关，表明通过径流进行了额外的运输。在Burano，盆地内的花粉沉积主要受形态计量学和沉积学因素的控制，它们解释了58.1%的观测方差。相比之下，在Orbetello泻湖，这些因素只解释了26.7%的差异，反映了沉积物和花粉再分配的更复杂的水动力控制。在水生类群中，微咸大型植物在广泛的盐度范围内占主导地位，主要受水深、盐度和溶解氧的控制。微藻群对温度和营养物质的可用性有反应，高浓度的有害藻类（Alexandrium spp.）表明生态压力。总的来说，这个现代空间数据集为解释化石记录和重建过去的环境变化提供了一个特定地点的框架。它还展示了将古生态学研究与现代数据结合起来，将科学知识转化为生物多样性保护的实际应用的潜力。

{"title":"Modern palynological assemblages from nearby Mediterranean coastal lagoons: implications for palaeoecological interpretation","authors":"Federica Badino , Adele Bertini , Matteo Pili , Rossano Ciampalini , Davide Baroni , Giacomo Querci , Cècile Vittori , Jean-Philippe Goiran","doi":"10.1016/j.revpalbo.2026.105502","DOIUrl":"10.1016/j.revpalbo.2026.105502","url":null,"abstract":"<div><div>Site-specific modern pollen assemblages are essential for interpreting fossil records, yet their links to local conditions and surrounding landscapes are often poorly understood. This study presents a modern palynological dataset from subsurface sediments of the shallow Burano and Orbetello lagoons in Tuscany, Italy. This dataset is part of a broader project which includes fossil sediment cores from the same basins. Spatially distributed samples were analyzed for grain-size, pollen, non-pollen palynomorphs, and sieved charcoal, with water physico-chemical parameters measured at each site. Terrestrial pollen assemblages mainly reflect regional wind-pollinated vegetation but show strong distortions, with forests overrepresented and open areas—especially cereal crops and vineyards—underrepresented. Modern calibration of <em>Pinus</em> and <em>Olea</em> pollen registrations is particularly informative given their key role in local human-driven landscape change. Sieved charcoal (>125 μm), a proxy for local fire, is unevenly distributed and correlated with <em>Glomus</em> chlamydospores, indicating additional transport via runoff. At Burano, intra-basin pollen deposition is largely controlled by morphometric and sedimentological factors which explain 58.1% of the observed variance. In contrast, at the Orbetello lagoon, these factors explain only 26.7% of the variance, reflecting more complex hydrodynamic controls on sediment and pollen redistribution. Among aquatic groups, brackish macrophytes dominate across broad salinity ranges, primarily controlled by water depth, salinity, and associated with dissolved oxygen. Microalgal groups respond to temperature and nutrient availability, with high concentrations of harmful algae (<em>Alexandrium</em> spp.) indicating ecological stress. Overall, this modern spatial dataset provides a site-specific framework for interpreting fossil records and reconstructing past environmental changes. It also demonstrates the potential of combining palaeoecological research with modern data to translate scientific knowledge into practical applications for biodiversity conservation.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"347 ","pages":"Article 105502"},"PeriodicalIF":1.7,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023912","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

Integrated palynological and ammonoid data from the uppermost Jurassic (Tithonian) deposits of Brzostówka, Poland, and its biostratigraphical and paleoenvironmental implications 波兰Brzostówka上侏罗统（铁桑系）沉积物的孢粉和氨化物综合资料及其生物地层和古环境意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-12 DOI: 10.1016/j.revpalbo.2026.105511

Iván R. Barreiro , Artai A. Santos , Sreepat Jain , Mariusz A. Salamon , José B. Diez

During the Late Jurassic, Earth experienced significant environmental changes impacting both marine and terrestrial ecosystems. This study combines new palynological and ammonite associations from the Brzostówka section, central Poland. The work aims to improve the stratigraphical resolution using ammonoid-based dating and interpret the paleoenvironment and paleoecology of the marine and terrestrial communities during the latest Jurassic. Ammonites Blaschkeiceras sp. and Ernstbrunnia sp. are identified underlying the newly reported palynological association belonging to the Standard Tethyan Fallauxi Zone. Both marine (more abundant) and terrestrial palynomorphs are reported. A total of 42 morphotypes were identified, and key taxa such as Cicatricosisporites sp., Wrevittia diutina, Pilosidinium myriatrichum, Dingodinium jurassicum, and Dingodinium minutum were used for age assignment corresponding to the upper part of the lower Tithonian, consistent with ammonite biozonation. The presence of ammonites and the dominance of marine palynomorphs indicates a marine or paralic depositional environment, likely within the neritic zone. The marine fraction of the palynological association is dominated by Gonyaulacales and indicates an environment with low nutrient availability. The plant communities, likely located in coastal areas close to the depositional site, were dominated by Cheirolepidiaceae conifers suggesting warm conditions. Additionally, the presence of other gymnosperm pollen and diverse spores of pteridophytes and bryophytes unveil the presence of a variety of plant families living in the area, with several ferns and mosses families inhabiting humid environments near freshwater sources.

在晚侏罗纪时期，地球经历了影响海洋和陆地生态系统的重大环境变化。这项研究结合了波兰中部Brzostówka剖面的新孢粉和菊石组合。本研究旨在利用氨态测年技术提高地层分辨率，解释晚侏罗世海洋和陆地群落的古环境和古生态。在新报道的属于标准特提斯法劳西带的孢粉学关联中，发现了Ammonites Blaschkeiceras sp.和Ernstbrunnia sp.。海洋（更丰富）和陆地的形态都有报道。共鉴定出42种形态型，并以Cicatricosisporites sp.、Wrevittia diutina、Pilosidinium myriatrichum、Dingodinium jurassum和Dingodinium minutum等关键分类群为下梯统上半期，与菊石生物分带一致。菊石的存在和海相地貌的优势表明一个海相或近岸沉积环境，可能在浅海带内。孢粉群落的海洋部分主要由Gonyaulacales组成，表明其环境中营养物质的有效性较低。植物群落可能位于靠近沉积地点的沿海地区，以针叶树科针叶树为主，表明气候温暖。此外，裸子植物花粉和多种蕨类植物和苔藓植物孢子的存在揭示了该地区生活着各种植物科，一些蕨类植物和苔藓类植物生活在靠近淡水水源的潮湿环境中。

{"title":"Integrated palynological and ammonoid data from the uppermost Jurassic (Tithonian) deposits of Brzostówka, Poland, and its biostratigraphical and paleoenvironmental implications","authors":"Iván R. Barreiro , Artai A. Santos , Sreepat Jain , Mariusz A. Salamon , José B. Diez","doi":"10.1016/j.revpalbo.2026.105511","DOIUrl":"10.1016/j.revpalbo.2026.105511","url":null,"abstract":"<div><div>During the Late Jurassic, Earth experienced significant environmental changes impacting both marine and terrestrial ecosystems. This study combines new palynological and ammonite associations from the Brzostówka section, central Poland. The work aims to improve the stratigraphical resolution using ammonoid-based dating and interpret the paleoenvironment and paleoecology of the marine and terrestrial communities during the latest Jurassic. Ammonites <em>Blaschkeiceras</em> sp. and <em>Ernstbrunnia</em> sp. are identified underlying the newly reported palynological association belonging to the Standard Tethyan <em>Fallauxi</em> Zone. Both marine (more abundant) and terrestrial palynomorphs are reported. A total of 42 morphotypes were identified, and key taxa such as <em>Cicatricosisporites</em> sp., <em>Wrevittia diutina</em>, <em>Pilosidinium myriatrichum</em>, <em>Dingodinium jurassicum</em>, and <em>Dingodinium minutum</em> were used for age assignment corresponding to the upper part of the lower Tithonian, consistent with ammonite biozonation. The presence of ammonites and the dominance of marine palynomorphs indicates a marine or paralic depositional environment, likely within the neritic zone. The marine fraction of the palynological association is dominated by Gonyaulacales and indicates an environment with low nutrient availability. The plant communities, likely located in coastal areas close to the depositional site, were dominated by Cheirolepidiaceae conifers suggesting warm conditions. Additionally, the presence of other gymnosperm pollen and diverse spores of pteridophytes and bryophytes unveil the presence of a variety of plant families living in the area, with several ferns and mosses families inhabiting humid environments near freshwater sources.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"347 ","pages":"Article 105511"},"PeriodicalIF":1.7,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146023913","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

Systematic revision of the non-pollen palynomorph Palambages Wetzel, 1961 非花粉型孢粉形态植物的系统订正[j]

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-01-08 DOI: 10.1016/j.revpalbo.2026.105501

Facundo De Benedetti , María C. Zamaloa , María A. Gandolfo , Néstor R. Cúneo

The fossil non-pollen palynomorph genus Palambages Wetzel comprises spheroidal bodies, composed of many oval, membranous cells. The original generic diagnosis was imprecise and overly broad. Herein, its diagnosis is emended through three main modifications: 1) the number of constituent cells per cluster follows a 2ⁿ pattern; 2) clusters are exclusively hollow and comprise a single peripheral layer of thin-walled cells; and 3) each cell possesses a central operculate aperture on the outer face. The new revised description minimizes overlapping with other morphologically similar cell clusters. The type species, Palambages morulosa, is also emended. All six species previously attributed to Palambages are reassessed to evaluate their taxonomic placement. P. morulosa and P. trilicius are retained within Palambages. Three species are transferred to the fungal spore genera Papulosporonites (i.e., Papulosporonites canadensis comb. nov., and Papulosporonites polycellularis comb. nov.) and Polyadosporites (i.e., Polyadosporites colonicus comb. nov.). The species P. pariunta probably represents a new genus and species pending direct examination of its type material. Notably, the two species retained in the genus have been recovered from marine to brackish deposits, suggesting an affinity with marine phytoplankton—a hypothesis further supported by sedimentological and paleontological proxies.

非花粉孢粉孢属古孢粉孢属的化石由许多卵圆形膜细胞组成的球状体组成。最初的通用诊断是不精确和过于宽泛的。在此，其诊断通过三个主要修改进行修正：1)每簇组成细胞的数量遵循2n模式；2)团簇完全中空并且包含薄壁细胞的单个外围层；以及3)每个细胞在其外表面具有一个中央多孔孔。新修订的描述最大限度地减少了与其他形态相似的细胞簇的重叠。模式种Palambages morulosa也进行了修订。所有6种以前归属于Palambages重新评估，以评估其分类位置。P. morulosa和P. trilicius被保留在Palambages中。三个种被转移到真菌孢子属巴布亚孢子虫（即，巴布亚孢子虫加拿大梳）。和多胞孢子虫梳状体。11月)和Polyadosporites（即Polyadosporites colonicus comb）。11月)。P. pariunta可能代表了一个新的属和种，有待于对其模式材料的直接检验。值得注意的是，该属中保留的两个物种都是从海洋到半咸淡水沉积物中发现的，这表明它们与海洋浮游植物有亲缘关系——这一假设得到了沉积学和古生物学指标的进一步支持。

{"title":"Systematic revision of the non-pollen palynomorph Palambages Wetzel, 1961","authors":"Facundo De Benedetti , María C. Zamaloa , María A. Gandolfo , Néstor R. Cúneo","doi":"10.1016/j.revpalbo.2026.105501","DOIUrl":"10.1016/j.revpalbo.2026.105501","url":null,"abstract":"<div><div>The fossil non-pollen palynomorph genus <em>Palambages</em> Wetzel comprises spheroidal bodies, composed of many oval, membranous cells. The original generic diagnosis was imprecise and overly broad. Herein, its diagnosis is emended through three main modifications: 1) the number of constituent cells per cluster follows a 2<sup>n</sup> pattern; 2) clusters are exclusively hollow and comprise a single peripheral layer of thin-walled cells; and 3) each cell possesses a central operculate aperture on the outer face. The new revised description minimizes overlapping with other morphologically similar cell clusters. The type species, <em>Palambages morulosa</em>, is also emended. All six species previously attributed to <em>Palambages</em> are reassessed to evaluate their taxonomic placement. <em>P. morulosa</em> and <em>P. trilicius</em> are retained within <em>Palambages</em>. Three species are transferred to the fungal spore genera <em>Papulosporonites</em> (i.e., <em>Papulosporonites canadensis</em> comb. nov., and <em>Papulosporonites polycellularis</em> comb. nov.) and <em>Polyadosporites</em> (i.e., <em>Polyadosporites colonicus</em> comb. nov.). The species <em>P. pariunta</em> probably represents a new genus and species pending direct examination of its type material. Notably, the two species retained in the genus have been recovered from marine to brackish deposits, suggesting an affinity with marine phytoplankton—a hypothesis further supported by sedimentological and paleontological proxies.</div></div>","PeriodicalId":54488,"journal":{"name":"Review of Palaeobotany and Palynology","volume":"347 ","pages":"Article 105501"},"PeriodicalIF":1.7,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928788","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