A new species of Reophax is documented from the shallow marine settings offshore Brunei Darussalam. The new taxon differs from other recent species of Reophax by its selective agglutination consisting mainly of tests of megalospheric specimens of Amphistegina. Reophax bruneiensis n.sp. differs from other known species in having a selectively agglutinated wall, few numbers of chambers increasing rapidly in size, and a terminal aperture not supported by any neck. This new species possibly acts as detritivore within the bottom sediments characterized by differentiated calcareous bioclasts and clay-sized siliciclasts derived by the river supply.
{"title":"Reophax bruneiensis n. sp. from the shallow-water environment of Brunei Darussalam","authors":"Sulia Goeting, A. Benedetti, A. Briguglio","doi":"10.47894/mpal.67.5.06","DOIUrl":"https://doi.org/10.47894/mpal.67.5.06","url":null,"abstract":"A new species of Reophax is documented from the shallow marine settings offshore Brunei Darussalam. The new taxon differs from other recent species of Reophax by its selective agglutination consisting mainly of tests of megalospheric specimens of Amphistegina. Reophax bruneiensis n.sp. differs from other known species in having a selectively agglutinated wall, few numbers of chambers increasing rapidly in size, and a terminal aperture not supported by any neck. This new species possibly acts as detritivore within the bottom sediments characterized by differentiated calcareous bioclasts and clay-sized siliciclasts derived by the river supply.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70446106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The studied section of the Patcham-Chari formations of Middle to Upper Jurassic rocks exposed at Jumara Dome, Kutch Basin, Gujarat, India yielded rich foraminiferal assemblages comprising 104 species, of which 49 are reported for the first time from the Indian region. The foraminiferal species are systematically described and illustratedwith the help of SEMimaging. The foraminiferal assemblages are used to interpret the age, paleoecology, and paleobiogeography. Although most of the foraminiferal species are rather long ranging, on the basis of a large number of species characteristic of the Bathonian, Callovian and Oxfordian, globally as well as in the Indian region, a Bathonian to Oxfordian age is assigned to the studied sequence. Based on the dominance of the suborder Lagenina, superfamily Nodosariacea, family Vaginulinidiae, calcareous hyaline forms, the genus Lenticulina, high Fisher’s diversity index, morphogroup J2, shallow infaunal life habit, detrivores, bacterial scavengers, and omnivores feeding strategy in the assemblages, a shallow water, near shore, open marine environment ranging from mid- to outer shelf with normal salinity and normal to well-oxygenated waters with high nutrient influx is interpreted for the studied assemblages. The Middle to Late Jurassic Jumara foraminiferal assemblages are assigned to a separate province of the Antiboreal Realm, the Indo-East African Province, located at the southern margin of the Tethyan Realm and transitional between the Tethyan and the Antiboreal realms.
{"title":"Systematics, age, paleoecology and paleobiogeography of Middle to Late Jurassic benthic foraminiferal assemblages from Jumara Dome, Kutch, Gujarat, India","authors":"Syed Md Wasim, A. Talib, S. H. Alvi","doi":"10.47894/mpal.67.1.06","DOIUrl":"https://doi.org/10.47894/mpal.67.1.06","url":null,"abstract":"The studied section of the Patcham-Chari formations of Middle to Upper Jurassic rocks exposed at Jumara Dome, Kutch Basin, Gujarat, India yielded rich foraminiferal assemblages comprising 104 species, of which 49 are reported for the first time from the Indian region. The foraminiferal species are systematically described and illustratedwith the help of SEMimaging. The foraminiferal assemblages are used to interpret the age, paleoecology, and paleobiogeography. Although most of the foraminiferal species are rather long ranging, on the basis of a large number of species characteristic of the Bathonian, Callovian and Oxfordian, globally as well as in the Indian region, a Bathonian to Oxfordian age is assigned to the studied sequence. Based on the dominance of the suborder Lagenina, superfamily Nodosariacea, family Vaginulinidiae, calcareous hyaline forms, the genus Lenticulina, high Fisher’s diversity index, morphogroup J2, shallow infaunal life habit, detrivores, bacterial scavengers, and omnivores feeding strategy in the assemblages, a shallow water, near shore, open marine environment ranging from mid- to outer shelf with normal salinity and normal to well-oxygenated waters with high nutrient influx is interpreted for the studied assemblages. The Middle to Late Jurassic Jumara foraminiferal assemblages are assigned to a separate province of the Antiboreal Realm, the Indo-East African Province, located at the southern margin of the Tethyan Realm and transitional between the Tethyan and the Antiboreal realms.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70444921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shantajhara Biswal, Kapesa Lokho, U. Shukla, K. Whiso, K. Prakash
This study presents results of integrated larger foraminiferal biostratigraphy, lithofacies and stable carbon isotope (13 C org) analysis carried out in the Sylhet Limestone of Dillai Parbat Limestone Mine succession, Karbi Anglong District, Assam. Larger foraminiferal assemblages assign a middle Eocene age to the studied succession of Sylhet Limestone. The Shallow Benthic Zone (SBZ) 13 and SBZ 16-18 and a barren interval in between is recognized in the studied part of the Sylhet Limestone. The SBZ 13 Zone (early Lutetian) is represented by fossiliferous limestone at the base of the section and is inferred to have been deposited in a subtidal environment. The overlying barren interval lies in the arenaceous interval and was likely deposited in a subtidal channel sand shoaling bars. The upper part of the section ismarked by SBZ16-18 (late Lutetian to Bartonian) and was deposited in subtidal channel sand inner neritic zone environments, followed by intertidal marl to subtidal limestone. The organic carbon stable isotopic data reveals a sharp negative excursion at about 34-35m of the succession, which may be correlated with Middle Eocene Climatic Optimum (MECO) and/or vegetation types. This and earlier studies from India and elsewhere indicate that during the middle Eocene, the Neo-Tethys Sea was open and connected through the East and West coasts of India, Northeast India, western Himalaya, and most of the Middle East and southeast Europe. This vast area produced enormous amount of petroleum.
{"title":"Eocene larger foraminiferal biostratigraphy, depositional history and paleogeography of the Sylhet Limestone of the Mikir Hills of Assam, NE India: Implications for an Open Tethys","authors":"Shantajhara Biswal, Kapesa Lokho, U. Shukla, K. Whiso, K. Prakash","doi":"10.47894/mpal.67.5.01","DOIUrl":"https://doi.org/10.47894/mpal.67.5.01","url":null,"abstract":"This study presents results of integrated larger foraminiferal biostratigraphy, lithofacies and stable carbon isotope (13 C org) analysis carried out in the Sylhet Limestone of Dillai Parbat Limestone Mine succession, Karbi Anglong District, Assam. Larger foraminiferal assemblages assign a middle Eocene age to the studied succession of Sylhet Limestone. The Shallow Benthic Zone (SBZ) 13 and SBZ 16-18 and a barren interval in between is recognized in the studied part of the Sylhet Limestone. The SBZ 13 Zone (early Lutetian) is represented by fossiliferous limestone at the base of the section and is inferred to have been deposited in a subtidal environment. The overlying barren interval lies in the arenaceous interval and was likely deposited in a subtidal channel sand shoaling bars. The upper part of the section ismarked by SBZ16-18 (late Lutetian to Bartonian) and was deposited in subtidal channel sand inner neritic zone environments, followed by intertidal marl to subtidal limestone. The organic carbon stable isotopic data reveals a sharp negative excursion at about 34-35m of the succession, which may be correlated with Middle Eocene Climatic Optimum (MECO) and/or vegetation types. This and earlier studies from India and elsewhere indicate that during the middle Eocene, the Neo-Tethys Sea was open and connected through the East and West coasts of India, Northeast India, western Himalaya, and most of the Middle East and southeast Europe. This vast area produced enormous amount of petroleum.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Septfontainella (type-species S. carpatobalcanica n. sp.), a new genus of larger benthic foraminifera (family Hauraniidae, subfamily Amijiellinae) is described from the upper Berriasian of the Carpatho-Balkanides, eastern Serbia and Romania (Southern Capathians), both part of the Getic domain. It is characterized by large elongate dimorphic tests with a reduced coiled stage and a rectilinear-uniserial adult part with chambers displaying a coarse and irregular subepidermal network. Triangular-shaped first order radial partitions extend into the chamber lumen attaching to the succeeding septum. Septfontainella gen. nov. is compared with the Lower Jurassic Cymbriaella Fugagnoli and the Lower Cretaceous Bramkampella Redmond. Septfontainella n. gen. further substantiates the occurrence of a Berriasian origination event of larger benthic foraminifera in inner carbonate platform facies of the Neotethysian realm.
Septfontainella(模式种S. carpatobalcanica n. sp.)是一种大型底栖有孔虫(Hauraniidae, Amijiellinae亚科)的新属，描述于喀尔巴阡-巴尔干半岛的上Berriasian，塞尔维亚东部和罗马尼亚(南卡帕西亚)，两者都是古域的一部分。它的特征是大的细长二态试验，具有减少的卷曲阶段和直线-单列的成体部分，其腔室显示粗糙和不规则的皮下网络。三角形的一级放射状隔墙延伸到腔内，与后继隔膜相连。将Septfontainella gen. 11与下侏罗世Cymbriaella Fugagnoli和下白垩世Bramkampella Redmond进行了比较。Septfontainella n. gen进一步证实了新特提斯宙内碳酸盐岩台地相大型底栖有孔虫Berriasian起源事件的发生。
{"title":"Septfontainella carpatobalcanica n. gen., n. sp., a new hauraniid foraminifera from the upper Berriasian of Serbia and Romania","authors":"F. Schlagintweit, I. Bucur, George Pleș","doi":"10.47894/mpal.67.6.05","DOIUrl":"https://doi.org/10.47894/mpal.67.6.05","url":null,"abstract":"Septfontainella (type-species S. carpatobalcanica n. sp.), a new genus of larger benthic foraminifera (family Hauraniidae, subfamily Amijiellinae) is described from the upper Berriasian of the Carpatho-Balkanides, eastern Serbia and Romania (Southern Capathians), both part of the Getic domain. It is characterized by large elongate dimorphic tests with a reduced coiled stage and a rectilinear-uniserial adult part with chambers displaying a coarse and irregular subepidermal network. Triangular-shaped first order radial partitions extend into the chamber lumen attaching to the succeeding septum. Septfontainella gen. nov. is compared with the Lower Jurassic Cymbriaella Fugagnoli and the Lower Cretaceous Bramkampella Redmond. Septfontainella n. gen. further substantiates the occurrence of a Berriasian origination event of larger benthic foraminifera in inner carbonate platform facies of the Neotethysian realm.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70446076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
While working on Trinidad and Tobago and the western tropical Atlantic Ocean, the author published four papers (Wilson 2006a, 2006b, 2006c;Wilson et al. 2011) that included descriptions of ten new species of foraminifera and ostracoda from the Neogene of the SE Caribbean Sea. These holotypes and associated paratypes have now been transferred to the European Micropalaeontological Reference Centre, AGH, University of Science and Technology, Krakow, Poland, for safekeeping. Among the foraminifera, these are: Amphistegina martybuzasi Wilson, Ramkissoon and McLean 2011; Bolivina jiattongi Wilson 2006; Textularia carrbrowni Wilson 2006; Textularia framptoni Wilson 2006; and Textularia sawhi Wilson 2006. Regarding ostracodes, they are: Bythoceratina coimbrai Wilson 2006; Cytheropteron bremani Wilson 2006; Polycope swietinia Wilson 2006; Polycope trinitatensis Wilson 2066; and Pterygocythereis fithiani Wilson 2006. The specimen slides have been curated in Cabinet 7, Drawer 27.
在研究特立尼达和多巴哥和热带大西洋西部时，作者发表了四篇论文(Wilson 2006a, 2006b, 2006c;Wilson et al. 2011)，其中包括对加勒比海东南部新近纪有孔虫和介形虫的十种新种的描述。这些全型和相关的副型现已转移到波兰克拉科夫科技大学AGH欧洲微体古生物学参考中心保存。在有孔虫中，有:Amphistegina martybuzasi Wilson, Ramkissoon and McLean 2011;玻利维亚贾通吉威尔逊2006;Textularia carrbrowni Wilson 2006;浙江本草，2006;和texularia sawhi Wilson 2006。关于介形类，它们是:Bythoceratina coimbrai Wilson 2006;刘志强，2006;林志刚，2006;Polycope trinitatensis Wilson 2066;菲蒂亚尼·威尔逊，2006。标本幻灯片被收藏在7号柜27号抽屉里。
{"title":"Transfer of type specimens of Caribbean Foraminifera and Ostracoda to the European Micropalaeontological Reference Centre","authors":"B. Wilson","doi":"10.47894/mpal.67.1.07","DOIUrl":"https://doi.org/10.47894/mpal.67.1.07","url":null,"abstract":"While working on Trinidad and Tobago and the western tropical Atlantic Ocean, the author published four papers (Wilson 2006a, 2006b, 2006c;Wilson et al. 2011) that included descriptions of ten new species of foraminifera and ostracoda from the Neogene of the SE Caribbean Sea. These holotypes and associated paratypes have now been transferred to the European Micropalaeontological Reference Centre, AGH, University of Science and Technology, Krakow, Poland, for safekeeping. Among the foraminifera, these are: Amphistegina martybuzasi Wilson, Ramkissoon and McLean 2011; Bolivina jiattongi Wilson 2006; Textularia carrbrowni Wilson 2006; Textularia framptoni Wilson 2006; and Textularia sawhi Wilson 2006. Regarding ostracodes, they are: Bythoceratina coimbrai Wilson 2006; Cytheropteron bremani Wilson 2006; Polycope swietinia Wilson 2006; Polycope trinitatensis Wilson 2066; and Pterygocythereis fithiani Wilson 2006. The specimen slides have been curated in Cabinet 7, Drawer 27.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70444938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Three-dimensionally preserved fragments of the enigmatic organism Sandvikina, previously reported from the Silurian of Ireland, Scotland and Scandinavia, were recovered from the original Irish material that had revealed the problematic in thin sections. The new specimens derive from conodont residue and document silicified sectors of the distal part of the skeleton. Adifferent pattern characterizes the outer and inner walls, with an external net-like reticulated and an internal continuous and apparently imperforate framework, getting therefore a filter-like feeding system function highly improbable.
{"title":"Little pieces of mystery from the Silurian of the Dingle Peninsula, Ireland","authors":"A. Ferretti, Lorenzo Serafini","doi":"10.47894/mpal.67.6.03","DOIUrl":"https://doi.org/10.47894/mpal.67.6.03","url":null,"abstract":"Three-dimensionally preserved fragments of the enigmatic organism Sandvikina, previously reported from the Silurian of Ireland, Scotland and Scandinavia, were recovered from the original Irish material that had revealed the problematic in thin sections. The new specimens derive from conodont residue and document silicified sectors of the distal part of the skeleton. Adifferent pattern characterizes the outer and inner walls, with an external net-like reticulated and an internal continuous and apparently imperforate framework, getting therefore a filter-like feeding system function highly improbable.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A biometric analysis was performed on twelve Nephrolepidina and ten Miogypsina and Miogypsinoides populations, coming from the Tre Valloni section, an Oligo-Miocene calcarenitic toe-of-slope succession outcropping in the southern sector of Gran Sasso (L'Aquila, Central Apennines - Italy). Miogypsina populations are investigated applying two essential parameters, i.e., the number of the nepionic chambers and the protoconch diameter. Previously detected evidences of reworking in the same material suggested to use some cautions to avoid misleading results. A mixed typological-statistical methodology is used, leading from starting "disordered" assemblages to final "virtual but reliable" populations, cleaned up from reworked specimens, in order to implement the accuracy of the biostratigraphic results. This goal is reached for the lower part of the succession only. According to the biometric limits proposed for the various chronospecies in the recent literature, the resulting populations are referred to Miogypsinoides ex. interc. complanatus-formosensis up to Md. bantamensis, and to Miogypsina basraensis up to M. ex. interc. gunteri-tani. This sequence of taxa, in general, is in agreement with the principle of nepionic acceleration, with a progressive reduction in the average number of nepionic chambers (X), arranged in a single spiral, just peculiar in the more primitive populations. Miogypsinoides bantamensis and Miogypsina basraensis are recognized biometrically for the first time in the Central Apennines. Nephrolepidina populations are investigated applying the recently introduced biometry of the fifth stage of the neanic equatorial chamberlets, supplying additional data about parameters and factors that had already demonstrated to have taxonomic-biostratigraphic significance. The biometric analysis of the embryo-nepionic stages was performed as an integration of the data obtained in a previous study, excluding the uppermost samples in which Nephrolepidina is clearly reworked, being characterized by primitive morphology, i.e., almost isolepidine embryo, few adauxiliary chamberlets, and ogival equatorial chamberlets. The neanic data evidence that the "Degree of stolonic distalization" (Factor FD5) and the "Shape Index" (Factor SI5), at the 5th nepionic stage of the population have a very good fitting with the previously evidenced Neanic acceleration, as the overall trend to modify the shape of the equatorial chambers, connected with a gradually more distal position of the radial stolons. Unispiralled Miogypsina, associated with Nephrolepidina at an advanced evolutionary stage, suggest a continuous reworking of primitive miogypsinids, without an involvement of more evolute bispiralled forms. The biostratigraphic assessment of the Venacquaro and Glauconitic Calcarenite formations is improved, assigning the Venacquaro Formation to the Chattian-lowermost Aquitanian (SBZ22B-basal SBZ24) and the base of the Glauconitic Calcatenite to the Aquitanian (SBZ2
{"title":"Nephrolepidina and unispiralled Miogypsinidae from the Oligo-Miocene toe-of-slope succession of Gran Sasso (L'Aquila, Central Apennines - Italy): biometric and evolutionary remarks","authors":"F. Schiavinotto, A. Benedetti","doi":"10.47894/mpal.67.5.04","DOIUrl":"https://doi.org/10.47894/mpal.67.5.04","url":null,"abstract":"A biometric analysis was performed on twelve Nephrolepidina and ten Miogypsina and Miogypsinoides populations, coming from the Tre Valloni section, an Oligo-Miocene calcarenitic toe-of-slope succession outcropping in the southern sector of Gran Sasso (L'Aquila, Central Apennines - Italy). Miogypsina populations are investigated applying two essential parameters, i.e., the number of the nepionic chambers and the protoconch diameter. Previously detected evidences of reworking in the same material suggested to use some cautions to avoid misleading results. A mixed typological-statistical methodology is used, leading from starting \"disordered\" assemblages to final \"virtual but reliable\" populations, cleaned up from reworked specimens, in order to implement the accuracy of the biostratigraphic results. This goal is reached for the lower part of the succession only. According to the biometric limits proposed for the various chronospecies in the recent literature, the resulting populations are referred to Miogypsinoides ex. interc. complanatus-formosensis up to Md. bantamensis, and to Miogypsina basraensis up to M. ex. interc. gunteri-tani. This sequence of taxa, in general, is in agreement with the principle of nepionic acceleration, with a progressive reduction in the average number of nepionic chambers (X), arranged in a single spiral, just peculiar in the more primitive populations. Miogypsinoides bantamensis and Miogypsina basraensis are recognized biometrically for the first time in the Central Apennines. Nephrolepidina populations are investigated applying the recently introduced biometry of the fifth stage of the neanic equatorial chamberlets, supplying additional data about parameters and factors that had already demonstrated to have taxonomic-biostratigraphic significance. The biometric analysis of the embryo-nepionic stages was performed as an integration of the data obtained in a previous study, excluding the uppermost samples in which Nephrolepidina is clearly reworked, being characterized by primitive morphology, i.e., almost isolepidine embryo, few adauxiliary chamberlets, and ogival equatorial chamberlets. The neanic data evidence that the \"Degree of stolonic distalization\" (Factor FD5) and the \"Shape Index\" (Factor SI5), at the 5th nepionic stage of the population have a very good fitting with the previously evidenced Neanic acceleration, as the overall trend to modify the shape of the equatorial chambers, connected with a gradually more distal position of the radial stolons. Unispiralled Miogypsina, associated with Nephrolepidina at an advanced evolutionary stage, suggest a continuous reworking of primitive miogypsinids, without an involvement of more evolute bispiralled forms. The biostratigraphic assessment of the Venacquaro and Glauconitic Calcarenite formations is improved, assigning the Venacquaro Formation to the Chattian-lowermost Aquitanian (SBZ22B-basal SBZ24) and the base of the Glauconitic Calcatenite to the Aquitanian (SBZ2","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Four Cretaceous foraminifers belonging to the subfamilies Pseudorhapydionininae, Orbitolininae and Dictyoconinae are here taxonomically revised: Pseudorhipidionina tubaensis, Bicyclina rifaiensis, Orbitolina arcuala, and Simplorbitolina nakhali. It is revealed that they should be considered junior synonyms of several existing species or inaccurately defined for specific identification. The new nominal names introduced to indicate such synonyms are invalidated, thus they are to be considered as nomen nudum.
{"title":"Taxonomic reassessment of four larger benthic Foraminifera (soritoids and orbitolinids) described from the Lower to mid-Cretaceous shallow-water carbonates of Iraq","authors":"L. Consorti, F. Schlagintweit","doi":"10.47894/mpal.67.5.05","DOIUrl":"https://doi.org/10.47894/mpal.67.5.05","url":null,"abstract":"Four Cretaceous foraminifers belonging to the subfamilies Pseudorhapydionininae, Orbitolininae and Dictyoconinae are here taxonomically revised: Pseudorhipidionina tubaensis, Bicyclina rifaiensis, Orbitolina arcuala, and Simplorbitolina nakhali. It is revealed that they should be considered junior synonyms of several existing species or inaccurately defined for specific identification. The new nominal names introduced to indicate such synonyms are invalidated, thus they are to be considered as nomen nudum.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Moncharmontia apenninca (De Castro 1966) is widely reported in the Upper Cretaceous (Turonian-Campanian) shallow-water successions of the Neotethyan realm (e.g., Italy, Croatia). With its "First Appearance Datum" (FAD) in the lowermost Turonian, it is considered a newcomer taxon in the aftermath of the Cenomanian/Turonian boundary (CTB) extinction event, and therefore a member of the Upper Cretaceous Global Community Maturation Cycle. Its common presence in the middle-pro parte upper Cenomanian Sarvak Formation and time-equivalent strata in Mexico (Valles-San Luis Potosi Platform) document that it represents a CTB extinction survivor taxon like Dicyclina, Nezzazata, Reticulinella and several others. The different local "FAD's" of Moncharmontia might possibly be linked to latitudinal differences, i.e., an earlier evolution of the species in the near-equatorial area (Mexico, Iran) compared to the low-middle latitudinal occurrences in the peri-Mediterranean realm (e.g., Italy, Turkey).
Moncharmontia apenninca (De Castro 1966)在新特提斯王国(如意大利、克罗地亚)的上白垩纪(Turonian-Campanian)浅水序列中被广泛报道。由于其“首次出现基准点”(First Appearance Datum, FAD)位于最底的Turonian，因此被认为是Cenomanian/Turonian边界(CTB)灭绝事件后的一个新分类单元，因此是上白垩纪全球群落成熟周期的成员。它在墨西哥(vales - san Luis Potosi台地)的上Cenomanian Sarvak组中后期和时间相当的地层中普遍存在，表明它代表了CTB灭绝幸存者的分类群，如Dicyclina, Nezzazata, Reticulinella和其他几个。Moncharmontia地区不同的“FAD”可能与纬度差异有关，即，与地中海周边地区(如意大利、土耳其)的低中纬度事件相比，近赤道地区(墨西哥、伊朗)的物种进化时间更早。
{"title":"Moncharmontia De Castro 1967, benthic foraminifera from the middle-upper Cenomanian of the Sarvak Formation of SW Iran (Zagros Zone): a CTB survivor taxon","authors":"F. Schlagintweit, M. Yazdi-Moghadam","doi":"10.47894/mpal.67.1.03","DOIUrl":"https://doi.org/10.47894/mpal.67.1.03","url":null,"abstract":"Moncharmontia apenninca (De Castro 1966) is widely reported in the Upper Cretaceous (Turonian-Campanian) shallow-water successions of the Neotethyan realm (e.g., Italy, Croatia). With its \"First Appearance Datum\" (FAD) in the lowermost Turonian, it is considered a newcomer taxon in the aftermath of the Cenomanian/Turonian boundary (CTB) extinction event, and therefore a member of the Upper Cretaceous Global Community Maturation Cycle. Its common presence in the middle-pro parte upper Cenomanian Sarvak Formation and time-equivalent strata in Mexico (Valles-San Luis Potosi Platform) document that it represents a CTB extinction survivor taxon like Dicyclina, Nezzazata, Reticulinella and several others. The different local \"FAD's\" of Moncharmontia might possibly be linked to latitudinal differences, i.e., an earlier evolution of the species in the near-equatorial area (Mexico, Iran) compared to the low-middle latitudinal occurrences in the peri-Mediterranean realm (e.g., Italy, Turkey).","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70444746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recent advances in the applications of deep neural networks in computer vision tasks such as image classification has seen a tremendous surge in interest. Several image classification algorithms can now be leveraged in automating some tedious tasks associated with benthic foraminifera research especially in sample picking, taxonomy and systematics. In this study, a small image identification model was built with 414 SEM micrographs representing twenty-one species of benthic foraminifera, using a convolutional neural network which achieved 84% model accuracy and 75% validation accuracy on previously unseen images. The model was also deployed through a web application to demonstrate how it may be useful in augmenting online databases such as the Ellis Messina catalogue and the World Register of Marine Species. These services although very valuable, can be modernized with image search functionalities to enhance their perpetual usefulness and continuity.
{"title":"Automating taxonomic and systematic search of benthic foraminifera in an online database","authors":"A. Amao","doi":"10.47894/mpal.67.6.06","DOIUrl":"https://doi.org/10.47894/mpal.67.6.06","url":null,"abstract":"Recent advances in the applications of deep neural networks in computer vision tasks such as image classification has seen a tremendous surge in interest. Several image classification algorithms can now be leveraged in automating some tedious tasks associated with benthic foraminifera research especially in sample picking, taxonomy and systematics. In this study, a small image identification model was built with 414 SEM micrographs representing twenty-one species of benthic foraminifera, using a convolutional neural network which achieved 84% model accuracy and 75% validation accuracy on previously unseen images. The model was also deployed through a web application to demonstrate how it may be useful in augmenting online databases such as the Ellis Messina catalogue and the World Register of Marine Species. These services although very valuable, can be modernized with image search functionalities to enhance their perpetual usefulness and continuity.","PeriodicalId":49816,"journal":{"name":"Micropaleontology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70445741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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