REVUE DE MICROPALEONTOLOGIE最新文献

{"title":"Ostracods from the Cassian formation (Carnian, Late Triassic)","authors":"Marie-Béatrice Forel","doi":"10.1016/j.revmic.2025.100840","DOIUrl":"10.1016/j.revmic.2025.100840","url":null,"abstract":"<div><div>Ostracod assemblages from three sites exposing the Cassian Formation (Carnian) in the Dolomites are here described and discussed: Seelandalpe, Milières and Pralongia. They are the opportunity to update their taxonomy and increase the knowledge of their biodiversity for the first time since the 1970s. Forty-three species distributed into 27 genera and 11 families are reported, numerous species being kept in open nomenclature because of rarity. <em>Hiatobairdia peggy</em> Forel sp. nov. is newly described and <em>Hungarella limbata</em>, the second species described from the Cassian Formation and originally attributed to the genus <em>Cytherella</em>, is re-attributed to <em>Aneisohealdia</em> based on the presence of an anterior spine. A neotype is designated for <em>Aneisohealdia limbata</em>, which type specimens were lost before the description of the species. Following the present analysis, 33 formal ostracod species are now known from the Cassian Formation. The Milières locality here provides the first record of Cypridinidae for the Cassian Formation, pointing to complex predator-prey relationships.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100840"},"PeriodicalIF":0.7,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The genus Hantkenina in Saudi Arabia: Implications for biostratigraphy and paleoecology across the Bartonian–Priabonian transition","authors":"Asmaa Korin ,&nbsp;Sherif Allam ,&nbsp;John D. Humphrey ,&nbsp;Abduljamiu O. Amao ,&nbsp;Korhan Ayranci ,&nbsp;Mohammed I. Najjar ,&nbsp;Ahmed A. Bahameem ,&nbsp;Iyad S. Zalmout ,&nbsp;Abdullah M. Memesh ,&nbsp;Michael A. Kaminski","doi":"10.1016/j.revmic.2025.100844","DOIUrl":"10.1016/j.revmic.2025.100844","url":null,"abstract":"<div><div>This research provides a first description and biostratigraphic analysis of <em>Hantkenina</em> species in the middle to upper Eocene Rashrashiyah Formation of the Sirhan-Turayf Basin, northwest Saudi Arabia. Seven species—<em>Hantkenina dumblei, H. australis, H. longispina, H. compressa, H. primitiva, H. alabamensis,</em> and <em>H. nanggulanensis</em>—are identified within planktonic foraminiferal biozones E13 to E14, aligning with the NP17 to NP18 calcareous nannoplankton zones. The co-occurrence of <em>H. dumblei, H. australis,</em> and <em>H. longispina</em> in the E13/NP17 Zone suggests a warm marine setting in the lower Rashrashiyah Formation, while their absence in the middle portion indicates a cooling interval, followed by a warming phase in the upper E14/NP18 Zone marked by the appearance of <em>H. compressa, H. primitiva</em>, and <em>H. alabamensis</em>. This stratigraphic transition, alongside stable isotope data (δ¹⁸O and δ¹³C) from benthic foraminifera, reflects complex temperature variations impacting species distribution. An unconformity between the Rashrashiyah and Miocene Sirhan formations points to the absence of upper Eocene and Oligocene deposits, likely due to significant eustatic sea-level fall during the Eocene–Oligocene transition and regional tectonic uplift of the Red Sea rifting and the Syrian Arc. Correlating planktonic foraminifera (E13–E14) with calcareous nannoplankton (NP17–NP18) zones improves the middle to late Eocene stratigraphy, confirming the presence of Bartonian and Priabonian sediments and challenging previous assumptions of an Eocene hiatus in Saudi Arabia. This study not only refines the Eocene stratigraphy of Saudi Arabia but also highlights the role of <em>Hantkenina</em> as a key biostratigraphic marker in global paleoecology reconstructions, strengthening worldwide Eocene correlations.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100844"},"PeriodicalIF":0.7,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A latest Carboniferous-earliest Permian palynoflora from the glacigenic Talchir Formation, Wardha Basin, central India and their biostratigraphic implications","authors":"Pauline Sabina Kavali ,&nbsp;Ayushi Mishra","doi":"10.1016/j.revmic.2025.100843","DOIUrl":"10.1016/j.revmic.2025.100843","url":null,"abstract":"<div><div>The Talchir Formation of the Gondwana Supergroup in India is a geological unit of glaciomarine/ glaciofluvial/glaciolacustrine origin that documents the glaciation that affected the supercontinent of Gondwana during the late Paleozoic. Previous spore-pollen biostratigraphy constrained the depositional age of the entire Talchir Formation to the Asselian. In this paper we present a palynological assemblage obtained from the Talchir Formation in the bore hole MAWP 114, drilled in the late Paleozoic Wardha Basin, central India. It comprises of a very rich assemblage of 79 species, of which 38 species are spores, 34 species pollen and seven species of algae. Based on the identification of radiometrically and faunally constrained biostratigraphically key species such as <em>Vittatina</em> spp., <em>Converrucosisporites confluens, Pseudoreticulatispora pseudoreticulata</em>, among others, an age not older than Gzhelian is inferred for the interval studied. The inferred age allows us to relate the Talchir deposits with the last episode of the Late Paleozoic Ice Age (LPIA). The palynological assemblage of the Talchir Formation from the present study favours its correlation with the radiometrically updated palynostratigraphic schemes established across Gondwana, on the basis of which it is constrained to the Gzhelian-early Sakmarian, encompassing the Carboniferous-Permian boundary. In India the position of the Permo-Carboniferous boundary is elusive due to lack of volcanic tuffs containing datable zircons; however, based on spore-pollen and zircon dates from Namibia this boundary is placed within the <em>P. confluens</em> Zone. Several taxa viz., <em>Cristatisporites lestai, C. inconstans, C. microvacuolatus, C. crassilabratus</em>, C. <em>menendezii, C. stellatus, Lundbladispora braziliensis, L.riobonitensis, L.areolata, L. obsoleta, Brevitriletes leptocaina</em> and<em>, B. parmatus</em> were documented for the first time in Indian Talchir sediments.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100843"},"PeriodicalIF":0.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paleoecology of Early Ladinian low-diversity radiolarian fauna from Mt. Svilaja (External Dinarides, Croatia)","authors":"Špela Goričan ,&nbsp;Tea Kolar-Jurkovšek ,&nbsp;Dunja Aljinović ,&nbsp;Tamara Troskot-Čorbić ,&nbsp;Bogdan Jurkovšek","doi":"10.1016/j.revmic.2025.100841","DOIUrl":"10.1016/j.revmic.2025.100841","url":null,"abstract":"<div><div>Dark-grey cherty limestone from Mt. Svilaja contains moderately well-preserved radiolarians of unusually low diversity. Nineteen genera were encountered, namely, only one fourth of genera known from the time equivalent Buchenstein Formation. Based on conodonts, the studied interval is assigned to the Lower Ladinian <em>Budurovignathus hungaricus</em> Zone. Ammonoids and allochthonous fossil elements (calcareous algae, corals, brachiopods, bivalves, benthic foraminifera, terrestrial-plant remains) from the same interval were previously reported. Facies and organic-matter analyses support the interpretation of depositional setting in a semi-enclosed basin with oxygen-deficient bottom waters. The radiolarian assemblage consists of spherical Entactinaria (Pentactinocarpidae, Heptacladidae, Hindeosphaeridae) and Spumellaria (<em>Archaeocenosphaera, Paurinella, Triassospongosphaera, Spongopallium</em>), and monocyrtid Nassellaria (mostly <em>Hozmadia</em>). Among Pentactinocarpidae, <em>Lobactinocapsa ellipsoconcha</em> Dumitrica is abundant and characterized by considerable variability of the cortical shell regarding its shape (ovoid to spherical), wall thickness (single-layered to spongy), and number of external spines. Eptingiidae, Oertlispongidae, Relindellidae, and all multicyrtid Nassellaria, common in the Buchenstein Formation as well as in radiolarian cherts associated with ophiolites, are missing. Similar, although less drastically reduced radiolarian fauna is known from the coeval San Giorgio Dolomite, which was also deposited in an oxygen-deficient intra-platform basin. The San Giorgio fauna lacks multicyrtid Nassellaria but still contains abundant Eptingiidae, Oertlispongidae, and Relindellidae. The likely factor reducing the diversity in the intra-platform basins was the vertical extent of the oxygen-deficient lower water column. Only surface-dwelling radiolarians were successful in stratified basins with expanded deep-water hypoxia.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100841"},"PeriodicalIF":0.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial preface to the INTERRAD XVI Virtual Special Issue on Mesozoic and Cenozoic Radiolaria","authors":"Špela Goričan ,&nbsp;Luis O'Dogherty ,&nbsp;Giuseppe Cortese","doi":"10.1016/j.revmic.2025.100842","DOIUrl":"10.1016/j.revmic.2025.100842","url":null,"abstract":"","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100842"},"PeriodicalIF":0.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"What is Pattersoncypris Bate (Ostracoda: Cyprididae)? A review of the genus and its species","authors":"Renata Juliana Arruda Maia ,&nbsp;Débora Almeida-Lima ,&nbsp;Juliana Guzmán ,&nbsp;Enelise Katia Piovesan","doi":"10.1016/j.revmic.2025.100833","DOIUrl":"10.1016/j.revmic.2025.100833","url":null,"abstract":"<div><div><em>Pattersoncypris</em> is a fossil ostracod genus represented by fourteen species recovered in non-marine, transitional and marine Cretaceous deposits from Brazil, Argentina, Liberia, Congo, Gabon, Angola, and Chad, and USA. As it is an abundant and diversified genus of the Early Cretaceous sedimentary basins of Brazil and Africa related to the opening of the South Atlantic Ocean, taxonomic misidentifications, which have been recurrently occurring with <em>Pattersoncypris</em> species, lead to problems regarding biostratigraphic, paleozoogeographic and paleoenvironmental interpretation. Face to this problem, the aim of this work was to study the morphological variations present in <em>Pattersoncypris</em> species, to identify the most robust diagnostic features that will allow reliable identification of the species, as well as to provide data that will facilitate understanding of the evolutionary history of the genus and its paleozoogeographic distribution. The genus was reviewed from morphological and taxonomic aspects. Ten species underwent taxonomic amendments, and a new species <em>Pattersoncypris labiata</em> n. sp. was proposed. Data analysis indicated that <em>Pattersoncypris</em> is an euryhaline genus that originated in the Gondwana continent, in the region that became the African Continent, from an ancestor of the genus <em>Hourcqia,</em> probably in the early Aptian. The adaptive radiation of the genus peaked during the Aptian, with the diversity center located in northeast Brazil. From the Albian onwards, there was a reduction in richness, with fewer species being recorded in Africa. An interval with no recorded species occurred during the early–middle Cenomanian. A single species was recorded in the late Cenomanian in USA, and by the end of this age, the genus was extinct.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"87 ","pages":"Article 100833"},"PeriodicalIF":0.7,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ostracods taxonomic study and other faunistic record from Costa Bausa (Buccheri, Southeastern Sicily)","authors":"Francesco Sciuto ,&nbsp;Angela Baldanza ,&nbsp;Agatino Reitano","doi":"10.1016/j.revmic.2024.100830","DOIUrl":"10.1016/j.revmic.2024.100830","url":null,"abstract":"<div><div>In Costa Bausa, along the left side of the Torrente Mazzarino (NE Buccheri, SE Sicily), marine sands referred to the Pliocene by many authors for their stratigraphic position and the molluscs fauna they contain, crop out unconformably above the Miocene carbonate succession. In the present study, the taxonomy of ostracods of these sands is performed and new species are described, the foraminifera are analyzed for the first time and a taxonomic list of molluscs is also provided. The ostracod fauna is composed of specimens mostly belonging to shallow marine genera, such as <em>Aurila, Neonesidea, Bosquetina, Callistocythere, Carynocythereis, Cistacythereis, Cytherelloidea, Cytheretta, Costa, Graptocythere, Grinioneis, Loxoconcha, Mutilus, Caudites, Pontocythere, Semicytherura, Tenedocythere, Urocythereis, Verrucocythereis</em> and <em>Xestoleberis</em>. Among them, eight species are newly described: <em>Perissocytheridea</em> (<em>Kroemmelbeinella</em>) <em>hiblaea</em> n. sp., <em>Aurila costabausaensis</em> n. sp., <em>Aurila daphnidis</em> n. sp., <em>Aurila mazzarinoensis</em> n. sp., <em>Aurila sanctiandreae</em> n. sp., <em>Tenedocythere forticostata</em> n. sp., <em>Cytheretta buccheriensis</em> n. sp., <em>Verrucocythereis verrucomurata</em> n. sp.</div><div>Among planktonic foraminifera, only few specimens of <em>Orbulina universa, O. suturalis, Trilobatus trilobus</em> and <em>T. sacculifer</em> occur. The assemblage of benthic foraminifera is characterized by <em>Amphistegina lobifera, A. lessonii, Elphidium crispum, E. macellum, Ammonia beccarii, A. parkinsoniana, Lobatula lobatula, Cancris auricula, Patellina corrugata, Quinqueloculina seminulum, Massilina oblonga, Oolina exagona</em> and <em>O. lineata</em>.</div><div>The molluscs association found has helped to relate the studied levels to the Late Pliocene.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"86 ","pages":"Article 100830"},"PeriodicalIF":0.7,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spumellarian, collodarian, and entactinarian radiolarians observed in sediment traps from the southern Ionian Sea (eastern mediterranean)","authors":"Marie Cueille ,&nbsp;Taniel Danelian ,&nbsp;Kenji M. Matsuzaki","doi":"10.1016/j.revmic.2024.100820","DOIUrl":"10.1016/j.revmic.2024.100820","url":null,"abstract":"<div><div>Based on sediment trap material collected from the southern Ionian Sea (Eastern Mediterranean), this study describes and illustrates 54 radiolarian species, 48 of which are spumellarians, 3 collodarians and 3 entactinarians. The presence of <em>Larcopyle buetschlii chenmuhongi, Phorticium polycladum</em>, and <em>Polysolenia collina</em> is reported for the first time from the Mediterranean Sea. We also identified for the first time <em>Spongodendron macrodoras</em> in the eastern Mediterranean Sea, previously known only from the western Mediterranean. Despite their geographical proximity, only six species are in common with the radiolarian fauna of the Adriatic Sea. We reviewed the biogeographical distribution and the known depth habitat of all species identified here at the species level. Most of them are known from tropical to temperate regions, although we also encountered few species with cold-water affinities such as <em>Lithelius minor, Lithelius nautiloides, Hexacromyum enthacanthum, Rhizosphaera mediana</em>, and <em>Spongodiscus resurgens</em>. Most of the encountered species are surface to sub-surface dwellers, including several known symbiont-bearing species, and only few are deep-dwellers, such as <em>Hexacromyum enthacanthum, Tetrapetalon echinaster, Lithelius nautiloides</em> and <em>Lithelius minor</em>.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"86 ","pages":"Article 100820"},"PeriodicalIF":0.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Progress on late Paleozoic radiolarians and their biostratigraphic applications – In memory of Martial CARIDROIT","authors":"Taniel Danelian ,&nbsp;Paula Noble ,&nbsp;Patrick De Wever","doi":"10.1016/j.revmic.2024.100821","DOIUrl":"10.1016/j.revmic.2024.100821","url":null,"abstract":"","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100821"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiolarian age and geochemical characteristics of the Permian bedded chert sequence in the Soi Dao area, Chanthaburi, Southeast of Thailand","authors":"Waraphorn Phromsuwan ,&nbsp;Yoshihito Kamata ,&nbsp;Takuya Hayashi ,&nbsp;Kei-ichi Kobayashi ,&nbsp;Thasinee Charoentitirat ,&nbsp;Katsumi Ueno ,&nbsp;Apsorn Sardsud","doi":"10.1016/j.revmic.2024.100786","DOIUrl":"10.1016/j.revmic.2024.100786","url":null,"abstract":"<div><div><span>Radiolarian<span> assemblages and geochemistry from </span></span>Permian<span> chert<span><span><span><span> and siliceous mudstone in the Soi Dao, Chanthaburi area of southeastern Thailand, are used here to determine the age and </span>depositional environment of these rocks. Moderate-to-well preserved radiolarian were obtained from three study areas, from bedded cherts and siliceous mudstones of Early Asselian to Early Capitanian, </span>Sakmarian to Roadian, and Capitanian to Changhsingian age. Considering the </span>lithofacies<span><span><span>, age, and chemical composition of the rocks, a primary stratigraphy can be reconstructed that consists, in ascending order, of basaltic rocks, radiolarian bedded cherts, siliceous mudstones, and clastics made of alternations of sandstone and mudstone. Geochemical analyses, particularly chondrite-normalized REEs patterns of chert and siliceous mudstone, show a gradual change in the degree of the Ce-negative anomaly, which decrease towards the younger strata. This change indicates that the depositional environment of the Permian rock was at the beginning highly influenced by </span>hydrothermal activity, which decreased with time, while the influx of terrestrial clastics increased. Permian bedded cherts accompanied by </span>basalts and siliceous mudstones recognized in the study area are very similar to the Paleo-Tethys bedded cherts in terms of their lithofacies and microscopic features; however, their depositional period is much shorter, indicating that they were deposited in another oceanic basin (i.e., a back-arc basin). The chemical composition also shows that the influence of hydrothermal activity weakened over time and the influence of terrigenous clastics increased.</span></span></span></div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100786"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141039762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}