Pub Date : 2025-07-16DOI: 10.1016/j.palwor.2025.200989
Glenn A. Brock , Zhi-Liang Zhang , Patrick M. Smith
The Ninmaroo Formation is a thick succession of richly fossiliferous carbonates that straddles the Cambrian (Furongian, Stage 10)–Lower Ordovician (Tremadocian, Tr1) boundary in the vicinity of Black Mountain (Mount Unbunmaroo) in western Queensland. Abundant, relatively coarsely silicified specimens of a plectorthoid brachiopod recovered from the lower Corrie Member of the Ninmaroo Formation type section are taxonomically described as a new species, Apheoorthis talenti n. sp. The stratigraphic level hosting the brachiopods occurs above the first occurrence, but within the biostratigraphic range, of the important age-diagnostic conodont species Cordylodus lindstromi which represents the upper Furongian Series (Stage 10) globally. In the Australian context, the new brachiopod occurs in the basal Warendan regional stage. Brachiopods are rare in Furongian rocks from Australia, making A. talenti n. sp. one of very few Cambrian Stage 10 rhynchonelliform brachiopods described from Australia.
Ninmaroo组是位于昆士兰州西部Black Mountain （Mount Unbunmaroo）附近的寒武纪（Furongian，第10阶段）-下奥陶统（Tremadocian, Tr1）边界上的一层厚层富含化石的碳酸盐岩。在Ninmaroo组下Corrie段发现了大量硅化程度相对较粗的钩形腕足动物标本，并将其分类为一个新种Apheoorthis talenti n. sp。该腕足动物所在的地层水平高于代表全球上弗洛隆统（第10期）的重要牙形刺物种Cordylodus lindstromi的第一次出现，但在生物地层范围内。在澳大利亚的背景下，新的腕足动物发生在瓦伦丹地区的基础阶段。腕足类动物在澳大利亚富龙纪岩石中极为罕见，使A. talenti n. sp成为澳大利亚为数不多的寒武世10期纹粒状腕足类动物之一。
{"title":"A new silicified plectorthoid brachiopod from the upper Furongian (Stage 10) Ninmaroo Formation at Black Mountain, western Queensland, Australia","authors":"Glenn A. Brock , Zhi-Liang Zhang , Patrick M. Smith","doi":"10.1016/j.palwor.2025.200989","DOIUrl":"10.1016/j.palwor.2025.200989","url":null,"abstract":"<div><div>The Ninmaroo Formation is a thick succession of richly fossiliferous carbonates that straddles the Cambrian (Furongian, Stage 10)–Lower Ordovician (Tremadocian, Tr1) boundary in the vicinity of Black Mountain (Mount Unbunmaroo) in western Queensland. Abundant, relatively coarsely silicified specimens of a plectorthoid brachiopod recovered from the lower Corrie Member of the Ninmaroo Formation type section are taxonomically described as a new species, <em>Apheoorthis talenti</em> n. sp. The stratigraphic level hosting the brachiopods occurs above the first occurrence, but within the biostratigraphic range, of the important age-diagnostic conodont species <em>Cordylodus lindstromi</em> which represents the upper Furongian Series (Stage 10) globally. In the Australian context, the new brachiopod occurs in the basal Warendan regional stage. Brachiopods are rare in Furongian rocks from Australia, making <em>A</em>. <em>talenti</em> n. sp. one of very few Cambrian Stage 10 rhynchonelliform brachiopods described from Australia.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"35 1","pages":"Article 200989"},"PeriodicalIF":1.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929073","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 : 2025-07-08DOI: 10.1016/j.palwor.2025.200987
Jorge Villegas-Martín , Leslie M.E. Manríquez , Bruna C. Schneider , Gerson Fauth , Rodrigo do Monte Guerra , Rodrigo S. Horodyski , Karlos G.D. Kochhann
A large Apectoichnus longissimus boring is described from a log fragment preserved in deposits of the lower Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula. The boring is interpreted to have been made by marine bivalves, probably teredinids. The relationship that exists between wood boring size and bivalve body size suggests that this animal achieved a body diameter exceeding that of the majority of known wood-boring teredinids. We attribute these borings to the possible activity of the giant teredinid Kuphus, which reaches the greatest length of any extant bivalves and produces borings with similar morphology to A. longissimus, as demonstrated by the extant Kuphus polythalamius. Thus, this record in the La Meseta deposits may provide a crucial early behavioral record of possible wood colonization by some enigmatic and rare species of this giant teredinid bivalve genus, at least, during the Eocene, and extending their geographic range to the Antarctic Peninsula.
{"title":"An uncommon large Eocene wood boring from the Antarctic Peninsula: Evidence of a giant teredinid bivalve?","authors":"Jorge Villegas-Martín , Leslie M.E. Manríquez , Bruna C. Schneider , Gerson Fauth , Rodrigo do Monte Guerra , Rodrigo S. Horodyski , Karlos G.D. Kochhann","doi":"10.1016/j.palwor.2025.200987","DOIUrl":"10.1016/j.palwor.2025.200987","url":null,"abstract":"<div><div>A large <em>Apectoichnus longissimus</em> boring is described from a log fragment preserved in deposits of the lower Eocene La Meseta Formation on Seymour Island, Antarctic Peninsula. The boring is interpreted to have been made by marine bivalves, probably teredinids. The relationship that exists between wood boring size and bivalve body size suggests that this animal achieved a body diameter exceeding that of the majority of known wood-boring teredinids. We attribute these borings to the possible activity of the giant teredinid <em>Kuphus</em>, which reaches the greatest length of any extant bivalves and produces borings with similar morphology to <em>A</em>. <em>longissimus</em>, as demonstrated by the extant <em>Kuphus polythalamius</em>. Thus, this record in the La Meseta deposits may provide a crucial early behavioral record of possible wood colonization by some enigmatic and rare species of this giant teredinid bivalve genus, at least, during the Eocene, and extending their geographic range to the Antarctic Peninsula.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200987"},"PeriodicalIF":1.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418151","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 : 2025-07-08DOI: 10.1016/j.palwor.2025.200988
Jian-Ye Chen , Jun Liu
In the Triassic of North China and Xinjiang, fossils of temnospondyls are common but fragmentary; no specimens have been confidently assigned to the genus level. Recently, a well-preserved temnospondyl skull with mandible was collected from the Heshanggou Formation of Jungar Banner, Nei Mongol, and a new taxon, Huangfuchuansuchus haojiamaoensis n. gen. n. sp. is established based on this specimen. The new taxon is diagnosed by bilobed anterior palatal vacuity with smoothly convex posterior margin, V-shaped transvomerine tooth rows, a shallow notch on the lateral margin of the subtemporal window, cultriform process extension approaching only anterior margin of interpterygoid vacuities, crista muscularis of the parasphenoid confluent in mid-line and anteromedial-posterolaterally positioned. It shows some features of Benthosuchidae but is placed as a basal member of Capitosauria based on phylogenetic analysis and character comparisons.
在华北和新疆三叠纪，颞脊椎骨化石普遍存在，但碎片化；没有标本被确定地归入属级。最近，在内蒙古准噶尔旗河上沟组发现了一具保存完好的带下颌骨的temnospondyl头骨，并在此基础上建立了一个新的分类群Huangfuchuansuchus haojiamaoensis n. gen. n. sp。该新分类群的诊断是：双叶状腭前空，后缘光滑凸，v型横切牙列，颞下窗外侧缘有浅切口，培养状突延伸仅接近蝶间空的前缘，副蝶状突融合的嵴肌层位于中线，前内侧-后外侧定位。根据系统发育分析和性状比较，它显示了底纲动物的一些特征，但被认为是头纲动物的基础成员。
{"title":"A basal member of Capitosauria from the Lower Triassic Heshanggou Formation, China","authors":"Jian-Ye Chen , Jun Liu","doi":"10.1016/j.palwor.2025.200988","DOIUrl":"10.1016/j.palwor.2025.200988","url":null,"abstract":"<div><div>In the Triassic of North China and Xinjiang, fossils of temnospondyls are common but fragmentary; no specimens have been confidently assigned to the genus level. Recently, a well-preserved temnospondyl skull with mandible was collected from the Heshanggou Formation of Jungar Banner, Nei Mongol, and a new taxon, <em>Huangfuchuansuchus haojiamaoensis</em> n. gen. n. sp. is established based on this specimen. The new taxon is diagnosed by bilobed anterior palatal vacuity with smoothly convex posterior margin, V-shaped transvomerine tooth rows, a shallow notch on the lateral margin of the subtemporal window, cultriform process extension approaching only anterior margin of interpterygoid vacuities, crista muscularis of the parasphenoid confluent in mid-line and anteromedial-posterolaterally positioned. It shows some features of Benthosuchidae but is placed as a basal member of Capitosauria based on phylogenetic analysis and character comparisons.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200988"},"PeriodicalIF":1.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418146","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 : 2025-07-07DOI: 10.1016/j.palwor.2025.200986
Marina Hakim , Mounir Maalouf , Dany Azar
The Early Cretaceous Bqaatouta and Baskinta (central Lebanon) amber yield new insect inclusions belonging to the order Psocodea. We describe one new genus and species, Archaeatropoglaris libanensis n. gen. n. sp., and attribute it tentatively to the extinct family Empheriidae (Trogiomorpha, Atropetae), sensu its latest composition which includes the ‘Archaeatropidae’. The new individuals have similar setae distribution on the forewing veins compared with the previously described material assigned to ‘Archaeatropidae’ from Lebanon. We also document a second occurrence of Archaeatropos randatae and potentially of Setoglaris reemae, both initially reported from other outcrops in south and central Lebanon respectively. Empheriidae remains to date the most diverse psocodean family in the number of genera and species in Lebanese amber. We also describe one psocodean nymph, although its taxonomic placement could not be determined.
早白垩世Bqaatouta和Baskinta（黎巴嫩中部）琥珀发现新的昆虫包裹体，属于Psocodea目。我们描述了一个新的属和种，Archaeatropoglaris libanensis n. gen. n. sp.，并初步将其归属于已灭绝的Empheriidae (Trogiomorpha, Atropetae)，并感觉其最新组成包括“Archaeatropidae”。与先前描述的来自黎巴嫩的“Archaeatropidae”的材料相比，新个体在前翅脉上具有相似的刚毛分布。我们还记录了第二次出现的Archaeatropos randatae和潜在的Setoglaris reemae，两者最初分别在黎巴嫩南部和中部的其他露头中报道。到目前为止，在黎巴嫩琥珀属和种的数量上，颠蝇科仍然是最多样化的颠蝇科。我们还描述了一种半codean若虫，尽管它的分类位置不能确定。
{"title":"New records of barklice (Psocodea, Empheriidae) from the Bqaatouta and Baskinta amber (early Barremian, Early Cretaceous) in Lebanon","authors":"Marina Hakim , Mounir Maalouf , Dany Azar","doi":"10.1016/j.palwor.2025.200986","DOIUrl":"10.1016/j.palwor.2025.200986","url":null,"abstract":"<div><div>The Early Cretaceous Bqaatouta and Baskinta (central Lebanon) amber yield new insect inclusions belonging to the order Psocodea. We describe one new genus and species, <em>Archaeatropoglaris libanensis</em> n. gen. n. sp., and attribute it tentatively to the extinct family Empheriidae (Trogiomorpha, Atropetae), sensu its latest composition which includes the ‘Archaeatropidae’. The new individuals have similar setae distribution on the forewing veins compared with the previously described material assigned to ‘Archaeatropidae’ from Lebanon. We also document a second occurrence of <em>Archaeatropos randatae</em> and potentially of <em>Setoglaris reemae</em>, both initially reported from other outcrops in south and central Lebanon respectively. Empheriidae remains to date the most diverse psocodean family in the number of genera and species in Lebanese amber. We also describe one psocodean nymph, although its taxonomic placement could not be determined.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200986"},"PeriodicalIF":1.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418041","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 : 2025-07-07DOI: 10.1016/j.palwor.2025.200985
Marina Hakim , Sahar Azar
A new pachytroctid genus and species, Libanopachytrocta planaspinosa n. gen. n. sp., is systematically described and illustrated from an Early Cretaceous (Barremian) amber outcrop in the easternmost region of Lebanon. This new taxon displays two interesting morphological features, one in the forewings (forked anal vein), which has never been reported previously in the family, and another in the maxillary palpomeres (apical palpomere with sigmoidal outer margin and two flattened spines). The Pachytroctidae are the most species-diverse troctomorphan family represented in Lebanese amber. This new discovery showcases the first fossil record of the subfamily Pachytroctinae to date.
在黎巴嫩最东部地区的早白垩世（巴雷米）琥珀露头中，系统地描述和说明了一个新的厚足动物属和种：Libanopachytrocta planaspinosa n. gen. n. sp.。这个新分类群表现出两个有趣的形态特征，一个是在前翼（分叉的肛门静脉），这在以前的科中从未报道过，另一个是在上颌掌柄（顶端掌柄具有s形外缘和两个扁平的刺）。厚形虫科是黎巴嫩琥珀中种类最丰富的原形虫科。这一新发现展示了迄今为止第一个厚皮虫亚科的化石记录。
{"title":"First psocodean from the Esh-Sheaybeh amber (Barremian, Early Cretaceous) of Lebanon","authors":"Marina Hakim , Sahar Azar","doi":"10.1016/j.palwor.2025.200985","DOIUrl":"10.1016/j.palwor.2025.200985","url":null,"abstract":"<div><div>A new pachytroctid genus and species, <em>Libanopachytrocta planaspinosa</em> n. gen. n. sp., is systematically described and illustrated from an Early Cretaceous (Barremian) amber outcrop in the easternmost region of Lebanon. This new taxon displays two interesting morphological features, one in the forewings (forked anal vein), which has never been reported previously in the family, and another in the maxillary palpomeres (apical palpomere with sigmoidal outer margin and two flattened spines). The Pachytroctidae are the most species-diverse troctomorphan family represented in Lebanese amber. This new discovery showcases the first fossil record of the subfamily Pachytroctinae to date.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200985"},"PeriodicalIF":1.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418154","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 : 2025-07-04DOI: 10.1016/j.palwor.2025.200984
Sergio Álvarez-Parra , Alexandr P. Rasnitsyn , Dany Azar
Serphitoids are a group of proctotrupomorphan wasps that, together with mymarommatoids, are characterized by a bipetiolate metasoma and grouped in the clade Bipetiolarida. The internal relationships of Serphitoidea and Mymarommatoidea are still unresolved, and their biology is poorly known. The fossil record of serphitoids is restricted to Cretaceous, ranging from Barremian to Campanian and is limited to specimens in amber so far. The family Serphitidae encompasses more than 30 species within the subfamilies Microserphitinae, Serphitinae, and Supraserphitinae. The subfamily Microserphitinae is well supported, but the distinctions between serphitines and supraserphitines are somewhat ambiguous. We describe Axioserphites obscurus n. gen. n. sp. from the Barremian (Early Cretaceous) Lebanese amber, belonging to the subfamily Supraserphitinae. We comment on the characters defining this subfamily and discuss its systematic validity.
丝状黄蜂是一群直发瘤黄蜂，与类纤维瘤黄蜂一起，具有双叶柄的特征，并被归为双叶柄进化门。serphito总科和mymarommato总科的内部关系仍未确定，其生物学也知之甚少。蛇形类的化石记录仅限于白垩纪，范围从巴雷米亚期到坎帕尼亚期，目前仅限于琥珀标本。绢蝇科包括微绢蝇亚科、绢蝇亚科和超绢蝇亚科内的30多个物种。微丝虫亚科得到了很好的支持，但丝虫碱和超丝虫碱之间的区别有些模糊。本文描述了Barremian（早白垩世）黎巴嫩琥珀中的Axioserphites obscurus n. gen. n. sp.，属于supererphitinae亚科。对这一亚族的特征进行了评述，并讨论了其系统有效性。
{"title":"A new serphitid wasp (Hymenoptera: Serphitidae) from the Early Cretaceous Lebanese amber","authors":"Sergio Álvarez-Parra , Alexandr P. Rasnitsyn , Dany Azar","doi":"10.1016/j.palwor.2025.200984","DOIUrl":"10.1016/j.palwor.2025.200984","url":null,"abstract":"<div><div>Serphitoids are a group of proctotrupomorphan wasps that, together with mymarommatoids, are characterized by a bipetiolate metasoma and grouped in the clade Bipetiolarida. The internal relationships of Serphitoidea and Mymarommatoidea are still unresolved, and their biology is poorly known. The fossil record of serphitoids is restricted to Cretaceous, ranging from Barremian to Campanian and is limited to specimens in amber so far. The family Serphitidae encompasses more than 30 species within the subfamilies Microserphitinae, Serphitinae, and Supraserphitinae. The subfamily Microserphitinae is well supported, but the distinctions between serphitines and supraserphitines are somewhat ambiguous. We describe <em>Axioserphites obscurus</em> n. gen. n. sp. from the Barremian (Early Cretaceous) Lebanese amber, belonging to the subfamily Supraserphitinae. We comment on the characters defining this subfamily and discuss its systematic validity.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200984"},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418047","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 : 2025-07-03DOI: 10.1016/j.palwor.2025.200983
Leonardo O. Alvarado-Cárdenas , Naylet K. Centeno-González , C. Sofía Islas-Hernández , Emilio Estrada-Ruiz
The Miocene amber deposit of Chiapas, Mexico, is one of the most important records in the world. It has a high diversity of plant inclusions, particularly the reproductive structures that are seldom preserved. Here we describe a new inclusion of a seed that has a narrowly oblong to linear shape, acuminate chalazal area, longitudinally striated, funicular furrow, micropylar tuft of hairs, all features found in Apocynaceae. Although Mexico is one of the centers of diversity for the family, with an estimated endemism rate of approximately 50%, the fossil record of this family in the country remains limited. Comparison with the extant and fossil seeds did not allow assignment to any known taxa, and therefore a new genus and species, Mesechitespermum endressiorum n. gen. n. sp., is proposed here. This new Miocene record supports the hypothesis that during this time the family was already present in some tropical areas of southeastern Mexico.
墨西哥恰帕斯的中新世琥珀矿床是世界上最重要的记录之一。它具有高度多样性的植物包裹体，特别是很少保存的生殖结构。在这里，我们描述了一种新的种子，它具有狭长圆形到线形，渐尖合点区，纵向条纹，索缕沟，微孔毛丛，在夹竹桃科中发现的所有特征。尽管墨西哥是该家族多样性的中心之一，估计其特有率约为50%，但该家族在该国的化石记录仍然有限。通过与现存种子和化石种子的比较，无法将其归属于任何已知的分类群，因此本文提出了一个新的属和种Mesechitespermum endressiorum n. gen. n. sp.。这个新的中新世记录支持了一种假设，即在此期间，这个家族已经出现在墨西哥东南部的一些热带地区。
{"title":"A new genus and species of Apocynaceae (Gentianales) seed macrofossil from the Early Miocene amber of Simojovel de Allende, Chiapas, Mexico","authors":"Leonardo O. Alvarado-Cárdenas , Naylet K. Centeno-González , C. Sofía Islas-Hernández , Emilio Estrada-Ruiz","doi":"10.1016/j.palwor.2025.200983","DOIUrl":"10.1016/j.palwor.2025.200983","url":null,"abstract":"<div><div>The Miocene amber deposit of Chiapas, Mexico, is one of the most important records in the world. It has a high diversity of plant inclusions, particularly the reproductive structures that are seldom preserved. Here we describe a new inclusion of a seed that has a narrowly oblong to linear shape, acuminate chalazal area, longitudinally striated, funicular furrow, micropylar tuft of hairs, all features found in Apocynaceae. Although Mexico is one of the centers of diversity for the family, with an estimated endemism rate of approximately 50%, the fossil record of this family in the country remains limited. Comparison with the extant and fossil seeds did not allow assignment to any known taxa, and therefore a new genus and species, <em>Mesechitespermum endressiorum</em> n. gen. n. sp., is proposed here. This new Miocene record supports the hypothesis that during this time the family was already present in some tropical areas of southeastern Mexico.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200983"},"PeriodicalIF":1.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418144","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 : 2025-07-03DOI: 10.1016/j.palwor.2025.200982
Hui Min , Rui-Wen Zong , Xun-Lian Wang
The new genus Sericonularia n. gen. is established based on material from the lower Silurian Fentou Formation in Wuhan, China. This genus differs from other conulariids in having extremely thin transverse ribs, thick septa along the corners of the periderm, and flat interspaces. The reproductive mode and the sessile stalk of conulariids have long been controversial. In this study, the holotype of the type species Sericonularia gemmata n. gen. n. sp. provides additional information about possible asexual budding in conulariids; moreover, this specimen offers additional evidence on the structure and morphology of the sessile stalk. We hypothesize that once the buds could live independently, they detached from their parent and then found a suitable substrate; notably, some conulariids used sessile stalks, rather than attachment discs, during their sessile life phase. These stalks appear to have the same structure as the upper periderm. Overall, our observations provide new insights into conulariid affinities and lifestyle.
根据武汉下志留统汾头组的资料，建立了绢虫属（Sericonularia n. gen.）。这个属不同于其他圆锥类在有极薄的横棱，沿周被的角厚的隔，和平的间隙。圆锥植物的生殖方式和无柄茎长期以来一直存在争议。在本研究中，模式种Sericonularia gemmata n. gen. n. sp.的全型为圆锥植物可能的无性出芽提供了额外的信息；此外，该标本为无柄茎的结构和形态提供了额外的证据。我们假设，一旦芽能够独立生活，它们就会从亲本中分离出来，然后找到合适的基质；值得注意的是，一些圆锥植物在其无柄生命阶段使用无柄茎，而不是附着盘。这些茎似乎与上周皮具有相同的结构。总的来说，我们的观察结果提供了新的见解，以了解锥体的亲和力和生活方式。
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Pub Date : 2025-06-30DOI: 10.1016/j.palwor.2025.200981
Supanut Bhuttarach , Uthumporn Deesri , Jeremy E. Martin , Sita Manitkoon , Jirasak Charoenmit , Komsorn Lauprasert
Teleosauroids are poorly known from Southeast Asia, with limited records from the Indochina Terrane of Thailand. To better understand their distribution and diversity, we describe new teleosauroid remains from two distinct geological terranes in Thailand. A nearly complete periorbital region and isolated teeth found in association from the Phu Kradung Formation (Upper Jurassic–Lower Cretaceous) of the Indochina Terrane are identified as cf. Indosinosuchus sp. The cranial specimen exhibits periorbital dimensions significantly larger than those of previously described Indosinosuchus specimens, likely representing the largest known individual of the genus and expanding our understanding of morphological diversity within this taxon. The discovery confirms the wide distribution of teleosauroids within the Phu Kradung Formation of the Khorat Plateau during the Late Jurassic to Early Cretaceous. Additionally, a frontal bone, left postorbital, and isolated teeth from the Klong Min Formation (upper Middle–Upper Jurassic) of the Sibumasu Terrane are assigned to Teleosauroidea indet. These remains, morphologically more primitive than Indosinosuchus, represent the first evidence of teleosauroids from southern peninsular Thailand and extend their known temporal range to the Middle Jurassic. Our findings demonstrate that teleosauroids were widely distributed across Thailand’s freshwater environments from the Middle Jurassic through Early Cretaceous, significantly expanding our understanding of their biogeographic distribution in Southeast Asia.
{"title":"New insights into the paleobiogeography of teleosauroid crocodylomorphs in Southeast Asia","authors":"Supanut Bhuttarach , Uthumporn Deesri , Jeremy E. Martin , Sita Manitkoon , Jirasak Charoenmit , Komsorn Lauprasert","doi":"10.1016/j.palwor.2025.200981","DOIUrl":"10.1016/j.palwor.2025.200981","url":null,"abstract":"<div><div>Teleosauroids are poorly known from Southeast Asia, with limited records from the Indochina Terrane of Thailand. To better understand their distribution and diversity, we describe new teleosauroid remains from two distinct geological terranes in Thailand. A nearly complete periorbital region and isolated teeth found in association from the Phu Kradung Formation (Upper Jurassic–Lower Cretaceous) of the Indochina Terrane are identified as cf. <em>Indosinosuchus</em> sp. The cranial specimen exhibits periorbital dimensions significantly larger than those of previously described <em>Indosinosuchus</em> specimens, likely representing the largest known individual of the genus and expanding our understanding of morphological diversity within this taxon. The discovery confirms the wide distribution of teleosauroids within the Phu Kradung Formation of the Khorat Plateau during the Late Jurassic to Early Cretaceous. Additionally, a frontal bone, left postorbital, and isolated teeth from the Klong Min Formation (upper Middle–Upper Jurassic) of the Sibumasu Terrane are assigned to Teleosauroidea indet. These remains, morphologically more primitive than <em>Indosinosuchus</em>, represent the first evidence of teleosauroids from southern peninsular Thailand and extend their known temporal range to the Middle Jurassic. Our findings demonstrate that teleosauroids were widely distributed across Thailand’s freshwater environments from the Middle Jurassic through Early Cretaceous, significantly expanding our understanding of their biogeographic distribution in Southeast Asia.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200981"},"PeriodicalIF":1.7,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145418145","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 : 2025-06-28DOI: 10.1016/j.palwor.2025.200980
Salma Soussi , Fares Khemiri , Amina Mabrouk El Asmi , Moez Ben Fadhel , Habib Troudi , Khaled El Asmi , Gonzalo Márquez Martinez
An integrated analysis of multiple geochemical proxies, including δ13Corg, total organic carbon (TOC), trace elements, and chemical gamma ray, coupled with a microfacies study and an age calibration using planktonic foraminiferal markers, was conducted at the Ain Asker section in northern Tunisia. This study provides significant insights into the depositional and paleoenvironmental dynamics of the mid-Cretaceous.
The carbon isotopic excursions observed at the Ain Asker section reflect a notable increase in the burial rate of marine organic carbon, specifically confined to the middle part of the Microhedbergella rischi biozone. TOC values recorded from the F2-ASK unit reach up to 2.3% combined with a δ13Corg values reaching -24.49‰, suggesting substantial accumulation of decayed marine organic matter. Although full anoxic conditions were not prevalent during deposition, evidence of oxygen-depleted bottom waters is clearly supported by the distribution patterns of redox-sensitive trace elements, such as vanadium and nickel. These findings underscore the role of partial oxygen restriction in facilitating organic matter preservation.
The enhanced burial of organic carbon is attributed to increased nutrient influx, likely driven by global sea-level transgressions and heightened surface productivity. These processes created favorable conditions for organic matter production and preservation. The integration of these sedimentological and geochemical findings with comparative records from Europe (France and Italy), China, and Mexico enables reliable correlation with the Paquier black shale level, a hallmark of OAE1b.
The Ain Asker section, through its detailed geochemical and isotopic signatures, emerges as a critical reference section for unraveling mid-Cretaceous anoxia dynamics within the southern Tethyan Realm. Its study enhances our understanding of the interplay between global paleoceanographic events and local depositional processes, shedding light on the mechanisms of organic carbon burial during a pivotal period in Earth’s history.
{"title":"Chemostratigraphy of Albian deposits in northern Tunisia: Identification of early Albian Oceanic Anoxic Event in the southern Tethys","authors":"Salma Soussi , Fares Khemiri , Amina Mabrouk El Asmi , Moez Ben Fadhel , Habib Troudi , Khaled El Asmi , Gonzalo Márquez Martinez","doi":"10.1016/j.palwor.2025.200980","DOIUrl":"10.1016/j.palwor.2025.200980","url":null,"abstract":"<div><div>An integrated analysis of multiple geochemical proxies, including δ<sup>13</sup>C<sub>org</sub>, total organic carbon (TOC), trace elements, and chemical gamma ray, coupled with a microfacies study and an age calibration using planktonic foraminiferal markers, was conducted at the Ain Asker section in northern Tunisia. This study provides significant insights into the depositional and paleoenvironmental dynamics of the mid-Cretaceous.</div><div>The carbon isotopic excursions observed at the Ain Asker section reflect a notable increase in the burial rate of marine organic carbon, specifically confined to the middle part of the <em>Microhedbergella rischi</em> biozone. TOC values recorded from the F2-ASK unit reach up to 2.3% combined with a δ<sup>13</sup>C<sub>org</sub> values reaching -24.49‰, suggesting substantial accumulation of decayed marine organic matter. Although full anoxic conditions were not prevalent during deposition, evidence of oxygen-depleted bottom waters is clearly supported by the distribution patterns of redox-sensitive trace elements, such as vanadium and nickel. These findings underscore the role of partial oxygen restriction in facilitating organic matter preservation.</div><div>The enhanced burial of organic carbon is attributed to increased nutrient influx, likely driven by global sea-level transgressions and heightened surface productivity. These processes created favorable conditions for organic matter production and preservation. The integration of these sedimentological and geochemical findings with comparative records from Europe (France and Italy), China, and Mexico enables reliable correlation with the Paquier black shale level, a hallmark of OAE1b.</div><div>The Ain Asker section, through its detailed geochemical and isotopic signatures, emerges as a critical reference section for unraveling mid-Cretaceous anoxia dynamics within the southern Tethyan Realm. Its study enhances our understanding of the interplay between global paleoceanographic events and local depositional processes, shedding light on the mechanisms of organic carbon burial during a pivotal period in Earth’s history.</div></div>","PeriodicalId":48708,"journal":{"name":"Palaeoworld","volume":"34 6","pages":"Article 200980"},"PeriodicalIF":1.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145128373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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