Rivista Italiana Di Paleontologia E Stratigrafia最新文献

NEW ACROPOMATIFORM FOSSILS FROM THE UPPER KUEICHULIN FORMATION (LOWER PLIOCENE), NORTHERN TAIWAN 台灣北部龜丘林上層（下新世）出土的新尖頂化石

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-05-22 DOI: 10.54103/2039-4942/22639

T. Přikryl, C. Lin, CHIA-HSIN HSU, SHIH-WEI LEE

{"title":"NEW ACROPOMATIFORM FOSSILS FROM THE UPPER KUEICHULIN FORMATION (LOWER PLIOCENE), NORTHERN TAIWAN","authors":"T. Přikryl, C. Lin, CHIA-HSIN HSU, SHIH-WEI LEE","doi":"10.54103/2039-4942/22639","DOIUrl":"https://doi.org/10.54103/2039-4942/22639","url":null,"abstract":"The Indo-West Pacific is home to a diverse array of modern fish species, and the study of their fossils can provide valuable insights into the origins and evolution of this biodiversity. This report presents rare remains of five individuals of acropomatiform fish, including a semi-articulated skeleton, recovered from the Upper Kueichulin Formation (Lower Pliocene) in northern Taiwan. The fossils are preserved in the form of nodules discovered at the locality known for abundant marine crustaceans and echinoderms. These specimens can be assigned to the family Stereolepididae, based on morphology of the opercle with the presence of two spines, a preopercle characterized by serrations on the posterior margin and denticulations on the ventral margin, and a distinctive skull architecture. Differences in skull morphology distinguish these specimens from other species within the genus and thus are described as Stereolepis arcanum n. sp. Significantly, the species represents the oldest known record of the family globally and stands as the second known fossil representative. This discovery not only enhances our understanding of the palaeobiodiversity of fish fauna in the Indo-West Pacific during the Neogene, but also highlights the importance of further research efforts in this area.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141111913","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

REVISITING THE CRETACEOUS LUNGFISH ATLANTOCERATODUS IHERINGI (AMEGHINO 1898) FROM THE MATA AMARILLA FORMATION (ARGENTINA) WITH COMMENTS ON TOOTH PLATES HISTOLOGY 重访阿根廷马塔阿马里拉地层中的白垩纪肺鱼 Atlantoceratodus Iheringi (Ameghino 1898) 并对齿板组织学进行评论

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-05-16 DOI: 10.54103/2039-4942/21646

KAREN M. PANZERI

{"title":"REVISITING THE CRETACEOUS LUNGFISH ATLANTOCERATODUS IHERINGI (AMEGHINO 1898) FROM THE MATA AMARILLA FORMATION (ARGENTINA) WITH COMMENTS ON TOOTH PLATES HISTOLOGY","authors":"KAREN M. PANZERI","doi":"10.54103/2039-4942/21646","DOIUrl":"https://doi.org/10.54103/2039-4942/21646","url":null,"abstract":"Atlantoceratodus iheringi (Ameghino 1898) from Argentine territory is restudied based on its known tooth plates and newly discovered material, which includes previously unknown skull roof bones and vomerine tooth plates. The latter represent the first records of such elements from the Mesozoic era in South America. The comparative morphological analysis reveals its distinctiveness from other dipnoans, and offers valuable data for future systematic and phylogenetic research. The pterygopalatine tooth plates display narrow-based first denticulations and lack anterior wear facets, with the inner angle positioned at the level of the second denticulation. Similarly, the prearticular tooth plates feature straight mediolingual edges, and a wide-based first denticulation without sinuosities at the tip. Histological sections are performed and analyzed in detail for the first time. A. iheringi presents in this aspect distinctive features such as: large-lumen denteons tending to cluster together, circumdenteonal dentine arranged in a double band (an inner birefringent and an outer monorefringent), and a disordered interdenteonal dentine, with birefringence surrounding denteons and areas with monorefringence. A. iheringi exhibits histological structure closer to Mesozoic and Cenozoic dipnoans than Paleozoic, especially resembling the disposition observed in the Upper Cretaceous Patagonian species Metaceratodus baibianorum. The wide distribution of features designated as diagnostic for Atlantoceratodus is discussed.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140968482","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

FIRST REPORT ON THE UPPERMOST PERMIAN OSTRACODS FROM THE MASORE SECTION (EXTERNAL DINARIDES), SLOVENIA 关于斯洛文尼亚马索雷断面（外迪纳里德）最上元古代梭形纲动物的首次报告

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-05-16 DOI: 10.54103/2039-4942/21186

TEA KOLAR-JURKOVŠEK, EWA OLEMPSKA, BOGDAN JURKOVŠEK

引用次数: 0

EOCENE STALKED CRINOIDS IN THE GENUS ISSELICRINUS (ECHINODERMATA, CRINOIDEA, ISOCRINIDA) FROM NORTHEASTERN ITALY 来自意大利东北部的始新世有柄棘皮动物伊斯利克林属（棘皮动物门，棘皮动物纲，伊斯利克林目

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-03-28 DOI: 10.54103/2039-4942/20885

Michel Roux, Pablo Martinez-Soares, E. Fornaciari, R. Gatto, Cesare A. Papazzoni, L. Giusberti

{"title":"EOCENE STALKED CRINOIDS IN THE GENUS ISSELICRINUS (ECHINODERMATA, CRINOIDEA, ISOCRINIDA) FROM NORTHEASTERN ITALY","authors":"Michel Roux, Pablo Martinez-Soares, E. Fornaciari, R. Gatto, Cesare A. Papazzoni, L. Giusberti","doi":"10.54103/2039-4942/20885","DOIUrl":"https://doi.org/10.54103/2039-4942/20885","url":null,"abstract":"Long fragments of isocrinid stalks belonging to the stalked crinoid genus Isselicrinus (Isocrinida, Isselicrininae) were found at Cambrigar, near Ferrara di Monte Baldo (Verona province, northeastern Italy) in the strata called “Harpactocarcinus punctulatus and Pentacrinus diaboli horizon”, traditionally ascribed to the lower Eocene (Ypresian). Morphometric analysis of this material allowed us to identify two distinct species filtering their food at different levels of the water column. The first species, characterized by a mostly pentagonal stalk section, is ascribable to Isselicrinus diaboli (Bayan), a taxon frequently cited from the lower Eocene of northeastern Italy but until now poorly known. The other species has a marked star-shaped stalk section presenting a combination of pedomorphic characters and is ascribed to the new taxon Isselicrinus baldoensis n. sp. A detailed analysis of numerous columnals and pluricolumnals of Isselicrinus diaboli from the type-locality of San Pancrazio near Mossano (Berici Hills, Vicenza province, northeastern Italy) allowed us to propose a revised and more complete diagnosis of this taxon. The particular burial conditions and the ecology of these two species are discussed as well as a reappraisal of the age of the “Harpactocarcinus punctulatus and Pentacrinus diaboli horizon”. Based on new calcareous nannofossil data, and confirmed by the larger foraminiferal assemblages, the isocrinids from Cambrigar are firmly assigned to the Lutetian (middle Eocene). Calcareous nannofossils identified in the matrix of historical hand specimens from the classical locality of San Pancrazio indicate a similar age.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140371416","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

NEW REPORT OF DECAPOD AND ISOPOD CRUSTACEANS FROM THE LOWERMIDDLE PLEISTOCENE OF MONTALBANO JONICO, MATERA (BASILICATA, SOUTHERN ITALY) 关于意大利南部巴西利卡塔地区蒙塔尔巴诺-约尼科中下更新世无足类和等足类甲壳动物的新报告

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-03-27 DOI: 10.54103/2039-4942/21645

A. Girone, A. Garassino, Giovanni Pasini, Andrea Zazzera, S. Gallicchio, P. Maiorano, Maria Marino, Rafael La Perna

{"title":"NEW REPORT OF DECAPOD AND ISOPOD CRUSTACEANS FROM THE LOWERMIDDLE PLEISTOCENE OF MONTALBANO JONICO, MATERA (BASILICATA, SOUTHERN ITALY)","authors":"A. Girone, A. Garassino, Giovanni Pasini, Andrea Zazzera, S. Gallicchio, P. Maiorano, Maria Marino, Rafael La Perna","doi":"10.54103/2039-4942/21645","DOIUrl":"https://doi.org/10.54103/2039-4942/21645","url":null,"abstract":"The study of the Lower-Middle Pleistocene decapod crustacean fauna from Montalbano Jonico succession allowed 12 taxa to be recognized. The studied samples include some fossil species already known from the Pleistocene record of Italy, as Ebalia nux A. Milne-Edwards, 1883, Monodaeus bortolottii Delle Cave, 1988, Liocarcinus depurator (Linnaeus, 1758), Goneplax rhomboides (Linnaeus, 1758), and Chlinocephalus demissifrons Ristori, 1886. These species are reported for the first time from Basilicata, except for E. nux, whereas Carcinoplax jonica n. sp. and Neogoneplax bradanica n. sp. are introduced as new species. Moreover, one poorly preserved specimen is assigned to Ebalia sp.; one dubitative specimen to ?Carcinus sp.; one specimen to Bathycalliax sp. (Axiidea de Saint Laurent, 1979); one to an indeterminate galatheid; and two poorly preserved large-sized specimens are tentatively referred to Carcinoplax sp. (Goneplacidae, MacLeay, 1838). Finally, several indeterminate specimens of cirolanid (Isopoda) are reported, as well.The studied decapod community from Basilicata allows us to expand our knowledge of Pleistocene fossil crabs and their distribution around the Mediterranean Sea basin in the Lower-Middle Pleistocene.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140376979","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

OF HIS BONES ARE CRINOID MADE: TAPHONOMY AND DEADFALL ECOLOGY OF MARINE REPTILES FROM A PELAGIC SETTING (MIDDLE-UPPER JURASSIC OF NORTHEASTERN ITALY) 他的骨头是板岩做的：海洋爬行动物在大洋环境（意大利东北部中-上侏罗世）中的岩石学和死亡生态学

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-03-22 DOI: 10.54103/2039-4942/22314

Giovanni Serafini, S. Danise, Erin E. MAXWELL, Luca Martire, J. Amalfitano, M. Cobianchi, U. Thun Hohenstein, L. Giusberti

{"title":"OF HIS BONES ARE CRINOID MADE: TAPHONOMY AND DEADFALL ECOLOGY OF MARINE REPTILES FROM A PELAGIC SETTING (MIDDLE-UPPER JURASSIC OF NORTHEASTERN ITALY)","authors":"Giovanni Serafini, S. Danise, Erin E. MAXWELL, Luca Martire, J. Amalfitano, M. Cobianchi, U. Thun Hohenstein, L. Giusberti","doi":"10.54103/2039-4942/22314","DOIUrl":"https://doi.org/10.54103/2039-4942/22314","url":null,"abstract":"Modern cetaceans are considered the best anatomical and ecological analogue for many Mesozoic secondary aquatic reptiles. Such similarities extend also after the death of these phylogenetically distant amniotes, when the sinking and decomposition of large carcasses in marine environments (deadfalls) follow common biostratinomic processes. Most taphonomic studies on Mesozoic deadfalls have been limited to shallow-water settings, often neglecting deeper waters. Here we provide a detailed taphonomic survey of ichthyosaurs, pliosaurs and metriorhynchoids from the pelagic Middle-Upper Jurassic Rosso Ammonitico Veronese (RAV) of northeastern Italy. Our taphonomic revision of the RAV tetrapod record highlights a common poor state of preservation of the bones, often associated with abundant macrofossils, consistent with a prolonged exposure of carcasses on a well-oxygenated seafloor. For the first time we confirm the role of nautiloids as active mobile scavengers by means of tens of beak elements found closely associated with, or even piercing, the bones. Hexanchiform shark teeth are also found associated with the carcasses, supporting a distinctive deep-water mobile scavenging community. Echinoids, sponges and other bioeroders are identified as representative of the enrichment-opportunist stage, and a high concentration of belemnites is believed to be indicative of mass-spawning deaths in the surroundings of the carcasses. Abundant crinoids are recognized as part of the reef stage by colonization of the eroded bones. While some of our data deviate from previous Mesozoic reptile-falls from shallow-waters, they are consistent with findings at Recent whale-falls in bathyal zones, and overall represent a precious window into the complex ecology of Jurassic open seas.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140216001","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

FIRST EVIDENCE OF PALAEO-TETHYAN UPPER TRIASSIC CALCAREOUS NANNOFOSSILS IN NORTH DOBROGEAN OROGEN (ROMANIA) 北多布罗格造山带（罗马尼亚）古三叠纪上三叠世钙质化石的首个证据

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-03-14 DOI: 10.54103/2039-4942/19776

I. Demangel, E. Grădinaru, Iuliana Lazăr, A. Seghedi, Ioan Munteanu

{"title":"FIRST EVIDENCE OF PALAEO-TETHYAN UPPER TRIASSIC CALCAREOUS NANNOFOSSILS IN NORTH DOBROGEAN OROGEN (ROMANIA)","authors":"I. Demangel, E. Grădinaru, Iuliana Lazăr, A. Seghedi, Ioan Munteanu","doi":"10.54103/2039-4942/19776","DOIUrl":"https://doi.org/10.54103/2039-4942/19776","url":null,"abstract":"This study presents the analysis of Upper Triassic sediments from five locations in North Dobrogea(Romania) and the Black Sea. Microfacies analyses on thin sections from the Frecăţei log reveal a shallowing trend and likely an increase in energy upward into the section. The oldest part of the log is characterised by deposition of mudstones transitioning to wackestones, with an increase of bivalves. Similar wackestones are observed in the Izvoarele and Rândunica logs, i.e. microfacies with abundant bivalves, some foraminifera and echinoderms. The offshore boreholes 816 and 817 Lebăda Vest (core CM 9 and CM 31) seem to have been deposited in a basinal or distal marine shelf environment indicated by the presence of mudstones with rare bioclasts. In contrast, sample CM 10 from borehole 816 LV is a micritised grainstone suggesting a deposition in a shallower, higher energy environment.Scanning electron microscope observations reveal a moderate diagenetic alteration in all studied samples, mainly due to dissolution. Two calcareous nannofossil species: Prinsiosphaera triassica triassica and Eoconusphaera zlambachensis were commonly observed in sample F of the Frecăţei log, allowing for assignment of the sediments to the Rhaetian age. Two coccoliths were also observed in sample F of Frecăţei log and sample CM 9 of the borehole 816 LV indicating the presence of coccolithophorids within the study region. This discovery constitutes the first confirmed record of well-preserved, determinable Upper Triassic calcareous nannofossils in the Palaeo-Tethys Ocean.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140242827","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

NEW FOSSIL LACEWING LARVAE WITH TRUMPET-SHAPED ELONGATE EMPODIA PROVIDE INSIGHT INTO THE EVOLUTION OF THIS ATTACHMENT STRUCTURE 新发现的具有喇叭形细长喙的草蛉幼虫化石有助于了解这种附着结构的进化过程

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-02-22 DOI: 10.54103/2039-4942/20847

Laura Buchner, Simon Linhart, Gergő Kalmar, Sofía Arce, G. Haug, J. Haug, C. Haug

{"title":"NEW FOSSIL LACEWING LARVAE WITH TRUMPET-SHAPED ELONGATE EMPODIA PROVIDE INSIGHT INTO THE EVOLUTION OF THIS ATTACHMENT STRUCTURE","authors":"Laura Buchner, Simon Linhart, Gergő Kalmar, Sofía Arce, G. Haug, J. Haug, C. Haug","doi":"10.54103/2039-4942/20847","DOIUrl":"https://doi.org/10.54103/2039-4942/20847","url":null,"abstract":"The larval life phase often represents the major share of the life span of holometabolans, such as beetles or flies. Therefore, knowledge of these larvae is crucial concerning ecological functions, but also concerning the evolutionary history of the different groups. In the holometabolan group Neuroptera (lacewings), larvae have numerous specialisations, among them the venom-injecting mouthparts, the stylets. Another such very characteristic feature of many lacewing larvae is the empodium, an attachment structure at the tip of the leg, which varies in shape in the larvae of the different lacewing groups. One type of empodium is the elongate trumpet-shaped type, which is found in several lacewing groups today as well as in many fossil representatives, especially well visible due to preservation in amber. Based on the pattern of phylogenetic distribution of the elongate trumpet-shaped empodium, different reconstructions of the evolution of this structure have been put forward, some suggesting possibly convergent evolution, others repetitive losses. In this study, new lacewing larvae preserved in 100-million-year-old amber from Myanmar are presented, which expand the number of lineages with an elongate trumpet-shaped empodium. Based on these new data, the implications on the evolutionary history of the different lineages within Neuroptera are discussed. The fossils demand for an earlier evolution in some reconstructions, but especially for more and later losses of this structure.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140441657","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

REMAINS OF THE ALIMENTARY TRACT IN THE LATE ORDOVICIAN TRILOBITE DALMANITINA (PRAGUE BASIN, BARRANDIAN AREA, CZECH REPUBLIC) 奥陶纪晚期三叶虫达尔马尼蒂娜的消化道残骸（捷克共和国巴兰地区布拉格盆地）

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-02-21 DOI: 10.54103/2039-4942/20845

O. Fatka, P. Budil, R. Mikuláš

{"title":"REMAINS OF THE ALIMENTARY TRACT IN THE LATE ORDOVICIAN TRILOBITE DALMANITINA (PRAGUE BASIN, BARRANDIAN AREA, CZECH REPUBLIC)","authors":"O. Fatka, P. Budil, R. Mikuláš","doi":"10.54103/2039-4942/20845","DOIUrl":"https://doi.org/10.54103/2039-4942/20845","url":null,"abstract":"Preservation of digestive structures in trilobites is generally rare; remains of the alimentary tract have been documented in about eighty of more than twenty thousand described species. Several tens of specimens belonging to five Cambrian and nine Ordovician species from the Barrandian area, Czech Republic, have markedly contributed to the knowledge of the trilobite digestive system. Here, we describe seven exceptionally preserved late holaspid trilobite specimens of species of the genus Dalmanitina collected from Upper Ordovician strata of the Barrandian area. All studied specimens are preserved as internal moulds and exhibit a narrow strip-like structure that runs sagitally or sub-sagitally under the axial lobe of the thoracopygon. These strip-like structures are markedly different from scavenger burrows and are interpreted as remains of the alimentary canal. A slightly expanded anterior-most part of the digestive system is preserved in the cephalic shield of six specimens and is interpreted as a remainder of the anterior midgut. A dark area is seen in the glabellar lobes of three specimens. These dark areas do not represent pyrite concentrations in the hypostome–glabellar cavity, because they contain only small amounts of Fe and S. These areas are interpreted as the remainder of cephalic digestive midgut diverticula, or the “perigastric organ”. Quantitative chemical analyses show that in species of Dalmanitina the digestive system is preserved as dark matter containing partly digested food particles and most probably also a higher amount of clay minerals. The described specimens constitute the first well-documented example of digestive structures in the subfamily Dalmanitininae.\u0000 ","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444423","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

REWORKED MESOZOIC RADIOLARIANS IN MIOCENE-PLIOCENE FORELAND SEDIMENTS IN THE ZAGROS BELT, IRAN 伊朗扎格罗斯带中新世-上新世前陆沉积物中再造的中生代放射虫

IF 2.3 3区地球科学

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2024-02-19 DOI: 10.54103/2039-4942/20461

Christian A. F. Dietzel, H. El Atfy, Christoph Berthold, M. Majidifard, M. Böhme

{"title":"REWORKED MESOZOIC RADIOLARIANS IN MIOCENE-PLIOCENE FORELAND SEDIMENTS IN THE ZAGROS BELT, IRAN","authors":"Christian A. F. Dietzel, H. El Atfy, Christoph Berthold, M. Majidifard, M. Böhme","doi":"10.54103/2039-4942/20461","DOIUrl":"https://doi.org/10.54103/2039-4942/20461","url":null,"abstract":"Micropaleontology can give important insights into the provenance and paleoenvironmental conditions in terrestrial sedimentary archives. For the current study, 84 samples representing a 2.6 km thick sedimentary profile from the SimplyFolded Zagros Mountain Belt were investigated. They span ca. 10.2 my from the late Middle Miocene (Serravallian) to the earliest Pleistocene (Gelasian), and comprised floodplain sediments and saline mudstones with an aeolian contribution. The mudstones revealed a unique Cretaceous radiolarian assemblage comprising largely of cryptothoracic Nassellarians and spherical spumellarians. This record highlights the reworking of sediments derived from Cretaceous Qulqula- Kermanshah radiolarian claystones and radiolarites in the Imbricated Zagros belt into the distal Neogene Zagros foreland sediments in Lurestan (Lurestan Arc). The high abundance of Holocryptocanium barbui (Dumitrica) and other cryptothoracic taxa compared to the Qulqula- Kermanshah radiolarian claystones and radiolarites potentially indicates a preferred erosion of softer units such as the Red Radiolarian Claystone Unit (RRCU) compared to harder radiolarian cherts. The observation of a reworked largely cryptothoracic assemblage might also point to additional sorting effects during fluvial and aeolian transport as well as during redeposition, depending on the morphology and hydrodynamic properties of individual radiolarian taxa.","PeriodicalId":54451,"journal":{"name":"Rivista Italiana Di Paleontologia E Stratigrafia","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140450989","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: 1