Swiss Journal of Palaeontology最新文献

{"title":"Phylogenetics and systematics of the subfamilies Cheirurinae and Deiphoninae (Trilobita).","authors":"Francesc Pérez-Peris, Jonathan M Adrain, Allison C Daley","doi":"10.1186/s13358-024-00338-1","DOIUrl":"10.1186/s13358-024-00338-1","url":null,"abstract":"<p><p>Cheiruridae is one of the most diverse families of trilobites known from the Ordovician with 453 species assigned. Within Cheiruridae eight subfamilies (Acanthoparyphinae, Cheirurinae, \"Cyrtometopinae\", Deiphoninae, Eccoptochilinae, Heliomerinae, Pilekiinae, and Sphaerexochinae) have historically been recognised. Insights about the evolution of the family and the relationships within and between subfamilies have been published. However larger scale phylogenetic hypotheses are needed in order to explore the monophyly, the basal structure, the deep nodes and the relationships of the subfamilies. Cheirurinae, Deiphoninae and \"Cyrtometopinae\" have historically been defined by various morphological features (e.g., anteroposterior constriction of the thoracic pleura, pleural furrow morphology, pygidial morphology) that differentiate them from the rest of Cheiruridae. However, the phylogenetic status of \"Cyrtometopinae\" is unclear owing to a lack of obvious synapomorphies. Here, we present phylogenetic analyses of Cheirurinae, Deiphoninae, and \"Cyrtometopinae\". The results indicate that both Cheirurinae and Deiphoninae are monophyletic. \"Cyrtometopines\" are resolved as a paraphyletic grade at the base of Deiphoninae and Cyrtometopinae should be considered a junior subjective synonym of Deiphoninae. The new phylogenetic hypothesis reveals that paedomorphosis plays an important role in the evolution of Deiphoninae. Within Cheirurinae two major clades are identified, the '<i>Ceraurus</i>-like' clade and the '<i>Ceraurinella</i>-like' clade.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1186/s13358-024-00338-1.</p>","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"143 1","pages":"43"},"PeriodicalIF":3.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11652639/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142866543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complex dental wear analysis reveals dietary shift in Triassic placodonts (Sauropsida, Sauropterygia).","authors":"Kinga Gere, András Lajos Nagy, Torsten M Scheyer, Ingmar Werneburg, Attila Ősi","doi":"10.1186/s13358-024-00304-x","DOIUrl":"10.1186/s13358-024-00304-x","url":null,"abstract":"<p><p>Placodonts were durophagous reptiles of the Triassic seas with robust skulls, jaws, and enlarged, flat, pebble-like teeth. During their evolution, they underwent gradual craniodental changes from the Early Anisian to the Rhaetian, such as a reduction in the number of teeth, an increase in the size of the posterior palatal teeth, an elongation of the premaxilla/rostrum, and a widening of the temporal region. These changes are presumably related to changes in dietary habits, which, we hypothesise, are due to changes in the type and quality of food they consumed. In the present study, the dental wear pattern of a total of nine European Middle to Late Triassic placodont species were investigated using 2D and 3D microwear analyses to demonstrate whether there could have been a dietary shift or grouping among the different species and, whether the possible changes could be correlated with environmental changes affecting their habitats. The 3D analysis shows overlap between species with high variance between values and there is no distinct separation. The 2D analysis has distinguished two main groups. The first is characterised by low number of wear features and high percentage of large pits. The other group have a high feature number, but low percentage of small pits. The 2D analysis showed a correlation between the wear data and the size of the enlarged posterior crushing teeth. Teeth with larger sizes showed less wear feature (with higher pit ratio) but larger individual features. In contrast, the dental wear facet of smaller crushing teeth shows more but smaller wear features (with higher scratch number). This observation may be related to the size of the food consumed, i.e., the wider the crown, the larger food it could crush, producing larger features. Comparison with marine mammals suggests that the dietary preference of <i>Placochelys</i>, <i>Psephoderma</i> and <i>Paraplacodus</i> was not exclusively hard, thick-shelled food. They may have had a more mixed diet, similar to that of modern sea otters. The diet of <i>Henodus</i> may have included plant food, similar to the modern herbivore marine mammals and lizards.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1186/s13358-024-00304-x.</p>","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"143 1","pages":"4"},"PeriodicalIF":3.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10844150/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139704139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thalattosauria in time and space: a review of thalattosaur spatiotemporal occurrences, presumed evolutionary relationships and current ecological hypotheses.","authors":"Dylan Bastiaans","doi":"10.1186/s13358-024-00333-6","DOIUrl":"https://doi.org/10.1186/s13358-024-00333-6","url":null,"abstract":"<p><p>In the wake of the greatest mass extinction in Earth's history, the End-Permian Mass Extinction, the Triassic was a time of recovery and innovation. Aided by warm climatic conditions and favorable ecological circumstances, many reptilian clades originated and rapidly diversified during this time. This set the stage for numerous independent invasions of the marine realm by several reptilian clades, such as Ichthyosauriformes and Sauropterygia, shaping the oceanic ecosystems for the entire Mesozoic. Although comparatively less speciose, and temporally and latitudinally more restricted, another marine reptile clade, the Thalattosauriformes, stands out because of their unusual and highly disparate cranial, dental and skeletal morphology. Research on Thalattosauriformes has been hampered by a historic dearth of material, with the exception of rare material from Lagerstätten and highly fossiliferous localities, such as that from the UNESCO world heritage site of Monte San Giorgio. Consequently, their evolutionary origins and paleobiology remain poorly understood. The recent influx of new material from southwestern China and North America has renewed interest in this enigmatic group prompting the need for a detailed review of historic work and current views. The earliest representatives of the group may have been present from the late Early Triassic onwards in British Columbia. By the Ladinian the group had achieved a wide distribution across the northern hemisphere, spanning the eastern Panthalassic as well as the eastern and western Tethyan provinces. Distinct morphological and likely ecological differences exist between the two major clades of Thalattosauriformes, the Askeptosauroidea and the Thalattosauroidea, with the latter showing a higher degree of cranial and skeletal morphological disparity. In-group relationships remain poorly resolved beyond this bipartition. Overall, thalattosaurs may be closely related to other marine reptile groups such as ichthyopterygians and sauropterygians. However, their exact position within Diapsida remains elusive. Future focal points should utilize modern digital paleontological approaches to explore the many fragmentary specimens of otherwise poorly sampled localities.</p>","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"143 1","pages":"36"},"PeriodicalIF":3.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11427521/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142333120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Special Issue: 100 years of scientific excavations at UNESCO World Heritage Site Monte San Giorgio and global research on Triassic marine Lagerstätten.","authors":"Christian Klug, Torsten M Scheyer, Nicole Klein, Jun Liu, Daniele Albisetti, Heinz Furrer, Rudolf Stockar","doi":"10.1186/s13358-024-00328-3","DOIUrl":"https://doi.org/10.1186/s13358-024-00328-3","url":null,"abstract":"<p><p>Only a few Swiss fossil localities are known globally and of which, the UNESCO World Heritage Site Monte San Giorgio, which extends from Switzerland into Italy, is the most important one. Following the discovery of the occurrence of articulated skeletons of marine reptiles in the local mines, large excavations were organized by Bernhard Peyer from the University of Zurich starting 1924. With this collection of articles, we commemorate the successful excavations and research, which initiated the publication of a series of monographies, mostly on the vertebrates but also on the invertebrates of this locality. Especially with the discovery of several remarkably similar Konservat-Lagerstätten in China, the discoveries from Monte San Giorgio gained global relevance. New methodologies such as computed tomography produced a wealth of new data, particularly on endocranial anatomy of several tetrapods.</p>","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"143 1","pages":"37"},"PeriodicalIF":3.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11457694/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142395579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The early fossil record of Caturoidea (Halecomorphi: Amiiformes): biogeographic implications","authors":"Adriana López-Arbarello, Andrea Concheyro, Ricardo M. Palma, Beatriz Aguirre-Urreta","doi":"10.1186/s13358-023-00297-z","DOIUrl":"https://doi.org/10.1186/s13358-023-00297-z","url":null,"abstract":"Caturoidea is a clade of Mesozoic predatory ray-finned fishes which lived mainly in the Jurassic. The clade has a few records in the earliest Cretaceous and only two in the Triassic. Among the latter, specimen MPCA 632 Caturus sp. doubtfully from continental Early Triassic of Argentina, i.e., outside Europe, was particularly problematic in the light of the known fossil record of the group, which suggested their origin in the Western Tethys. The micropaleontological and geochemical analysis of bulk-rock samples of MPCA 632 allowed us to correct the provenance of the specimen which corresponds to Tithonian marine outcrops of the Vaca Muerta Formation, Neuquén, Argentina. Specimen MPCA 632 is excluded from Caturus and reclassified as Caturoidea sp. MPCA 632 might be a specimen of Catutoichthys olsacheri, the only caturoid known from the Vaca Muerta Formation (Los Catutos Member), but the fossils are not comparable and, thus, this hypothesis needs further study. Additionally, the first-hand study of the type material of the only other alleged Triassic caturoid, Furo insignis, in the Norian of Seefeld, Austria, led to the exclusion of this taxon from the Caturoidea. Consequently, the clade Caturoidea is restricted to the Jurassic–Lowest Cretaceous. After a modest evolution during the Early Jurassic, the group had its initial radiation and westward dispersion across the Hispanic Corridor during the Middle Jurassic and reached its maximal diversity during the Kimmeridgian and Tithonian.","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"296 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138526737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kasimovian (late Pennsylvanian) cornute rugose corals from Egypt: taxonomy, facies and palaeogeography of a cool-water fauna from northern Gondwana","authors":"Heba El-Desouky, Hans-Georg Herbig, Mahmoud Kora","doi":"10.1186/s13358-023-00296-0","DOIUrl":"https://doi.org/10.1186/s13358-023-00296-0","url":null,"abstract":"A strongly endemic Upper Pennsylvanian (Kasimovian) rugose coral association consisting of small, mostly non-dissepimented, simple structured and poorly diversified species is studied from the lower member of the Aheimer Formation (Western side of the Gulf of Suez, Egypt). The unit is composed of grey, silty mudstone intercalated with thin, ferruginous, silty dolostone–limestone and calcareous siltstone beds. Ten taxa from four families were identified. Four species of the Antiphyllinae are new; Actinophrentis crassithecata n. sp., Lytvolasma aheimerensis n. sp., L. paraaucta n. sp. and Monophyllum galalaensis n. sp. Besides, Rotiphyllum exile de Groot, 1963 and Bothrophyllum okense Kossovaya, 2001 were identified; four taxa remain in open nomenclature (Lytvolasma cf. canadense, Zaphrentites cf. parallela, Zaphrentites sp. and Ufimia sp.). Rejuvenation, encrustation and bioerosion phenomena are rare. Attachment structures during mature stages are not evident; attachment scars in the apical parts are also rare. Growth patterns and embedding in the muddy deposits indicates that the corals lived as mudstickers in soft substrate. Recrystallization, dolomitization and ferrugination of open pore spaces inside the corals are the most common diagenetic features. The corals from the lower Aheimer Formation represent a typical cyathaxonid fauna that was adapted to high clastic input and turbid waters in a restricted, sheltered, episodically storm-swept inner ramp environment in an embayment of the southern shelf of the Palaeotethys. A time-averaged ramp model shows a regressive development from a mixed carbonate–siliciclastic open inner ramp setting during the Moscovian to the restricted inner ramp of the lower Aheimer Formation (Kasimovian) and following peritidal to fluvial environments of the Gzhelian. General and local palaeoclimatic considerations indicate cooling. Besides relations to northern Spain that root Egypt in the western Palaeotethys, connections existed via the Donets Basin (and the southern Urals) to the Cordilleran–Arctic–Uralian realm which is a cool water province during the Lower and Middle Permian. The Egyptian fauna appears to be a precursor of the anti-tropical cyathaxonid fauna of the latter time slice and also of the Lower Permian cool-water faunas of the east Cimmerian peri-Gondwana terranes.","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"75 5","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138526739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction: Impact of increasing morphological information by micro-CT scanning on the phylogenetic placement of Darwin wasps (Hymenoptera, Ichneumonidae) in amber","authors":"Alexandra Viertler, Karin Urfer, Georg Schulz, Seraina Klopfstein, Tamara Spasojevic","doi":"10.1186/s13358-023-00299-x","DOIUrl":"https://doi.org/10.1186/s13358-023-00299-x","url":null,"abstract":"&lt;p&gt;&lt;b&gt;Correction: Swiss Journal of Palaeontology (2023) 142:30 &lt;/b&gt;&lt;b&gt;https://doi.org/10.1186/s13358-023-00294-2&lt;/b&gt;&lt;/p&gt;&lt;br/&gt;&lt;p&gt;Following publication of the original article (Viertler et al., 2023), we have been informed that there is wrong inventory number for one of the fossils.&lt;/p&gt;&lt;p&gt;The incorrect number is: #F02444&lt;/p&gt;&lt;br/&gt;&lt;p&gt;The correct number is: NMB F3742&lt;/p&gt;&lt;p&gt;The original article (Viertler et al., 2023) has been corrected.&lt;/p&gt;&lt;ul data-track-component=\"outbound reference\"&gt;&lt;li&gt;&lt;p&gt;Viertler, A., Urfer, K., Schulz, G., Klopfstein, S., &amp; Spasojevic, T. (2023). Impact of increasing morphological information by micro-CT scanning on the phylogenetic placement of Darwin wasps (Hymenoptera, Ichneumonidae) in amber. &lt;i&gt;Swiss Journal of Palaeontology,&lt;/i&gt; &lt;i&gt;142&lt;/i&gt;, 30. https://doi.org/10.1186/s13358-023-00294-2&lt;/p&gt;&lt;p&gt;Article Google Scholar &lt;/p&gt;&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;Download references&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"16\" role=\"img\" width=\"16\"&gt;&lt;use xlink:href=\"#icon-eds-i-download-medium\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;/use&gt;&lt;/svg&gt;&lt;/p&gt;&lt;h3&gt;Authors and Affiliations&lt;/h3&gt;&lt;ol&gt;&lt;li&gt;&lt;p&gt;Natural History Museum Basel, Augustinergasse 2, 4051, Basel, Switzerland&lt;/p&gt;&lt;p&gt;Alexandra Viertler, Seraina Klopfstein &amp; Tamara Spasojevic&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;p&gt;Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012, Bern, Switzerland&lt;/p&gt;&lt;p&gt;Alexandra Viertler, Seraina Klopfstein &amp; Tamara Spasojevic&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;p&gt;Natural History Museum St. Gallen, Rorschacher Strasse 263, 9016, St. Gallen, Switzerland&lt;/p&gt;&lt;p&gt;Karin Urfer&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;p&gt;Core Facility Micro- and Nanotomography, Department of Biomedical Engineering, University of Basel, Hegenheimermattweg 167 B/C, 4123, Allschwil, Switzerland&lt;/p&gt;&lt;p&gt;Georg Schulz&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;p&gt;Biomaterials Science Center, Department of Biomedical Engineering, University of Basel, Hegenheimermattweg 167 B/C, 4123, Allschwil, Switzerland&lt;/p&gt;&lt;p&gt;Georg Schulz&lt;/p&gt;&lt;/li&gt;&lt;/ol&gt;&lt;span&gt;Authors&lt;/span&gt;&lt;ol&gt;&lt;li&gt;&lt;span&gt;Alexandra Viertler&lt;/span&gt;View author publications&lt;p&gt;You can also search for this author in &lt;span&gt;PubMed&lt;span&gt; &lt;/span&gt;Google Scholar&lt;/span&gt;&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;span&gt;Karin Urfer&lt;/span&gt;View author publications&lt;p&gt;You can also search for this author in &lt;span&gt;PubMed&lt;span&gt; &lt;/span&gt;Google Scholar&lt;/span&gt;&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;span&gt;Georg Schulz&lt;/span&gt;View author publications&lt;p&gt;You can also search for this author in &lt;span&gt;PubMed&lt;span&gt; &lt;/span&gt;Google Scholar&lt;/span&gt;&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;span&gt;Seraina Klopfstein&lt;/span&gt;View author publications&lt;p&gt;You can also search for this author in &lt;span&gt;PubMed&lt;span&gt; &lt;/span&gt;Google Scholar&lt;/span&gt;&lt;/p&gt;&lt;/li&gt;&lt;li&gt;&lt;span&gt;Tamara Spasojevic&lt;/span&gt;View author publications&lt;p&gt;You can also search for this author in &lt;span&gt;PubMed&lt;span&gt; &lt;/span&gt;Google Scholar&lt;/span&gt;&lt;/p&gt;&lt;/li&gt;&lt;/ol&gt;&lt;h3&gt;Corresponding author&lt;/h3&gt;&lt;p&gt;Correspondence to Alexandra Viertler.&lt;/p&gt;&lt;p&gt;Handling editor: Harriet Bethany Drage.&lt;/p&gt;&lt;h3&gt;Publisher's Note&lt;/h3&gt;&lt;p&gt;Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional af","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"34 30","pages":""},"PeriodicalIF":3.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138526728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Santiago Roth and his scientific legacy: a reappraisal of the Swiss collections","authors":"Analía M. Forasiepi, Gabriel Aguirre-Fernández","doi":"10.1186/s13358-023-00287-1","DOIUrl":"https://doi.org/10.1186/s13358-023-00287-1","url":null,"abstract":"","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136013836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new giant nautilid species from the Middle Jurassic of Luxembourg and Southwest Germany","authors":"Robert Weis, Günter Schweigert, Julian Wittische","doi":"10.1186/s13358-023-00290-6","DOIUrl":"https://doi.org/10.1186/s13358-023-00290-6","url":null,"abstract":"Abstract In comparison to other cephalopods such as ammonites and belemnites, nautilid shells are relatively rare fossils in Jurassic marine deposits and knowledge of their taxonomy is therefore still patchy. We describe herein a new species of Cenoceras , C. rumelangense , from the early Bajocian Humphriesianum Zone of Luxembourg and Southwest Germany. In Luxembourg, the type material occurs in the ‘Marnes sableuses d’Audun-le-Tiche’ unit, which yields other large-sized cephalopods, such as the largest known belemnite genus, Megateuthis . The new species reaches a remarkable size, with diameters up to 610 mm. Thus, it is amongst the largest known post-Triassic nautilids worldwide, together with Paracenoceras giganteum and Paracenoceras ingens from the Upper Jurassic. Additionally, we discuss some aspects of the taphonomy of these large shells deposited in a shallow marine setting.","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135387546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Pliocene otolith assemblages from the outer-shelf environment reveal the establishment of mesopelagic fish fauna over 3 million years ago in southwestern Taiwan","authors":"Chien-Hsiang Lin, Siao-Man Wu, Chia-Yen Lin, Chi-Wei Chien","doi":"10.1186/s13358-023-00288-0","DOIUrl":"https://doi.org/10.1186/s13358-023-00288-0","url":null,"abstract":"Abstract Understanding the diversity of deep-sea fish fauna based on otoliths in the tropical and subtropical West Pacific has been limited, creating a significant knowledge gap regarding regional and temporal variations in deep-sea fish fauna. To address this gap, we collected a total of 122 bulk sediment samples from the Lower Pliocene Gutingkeng Formation in southwestern Taiwan to reconstruct the otolith-based fish fauna. Using planktonic foraminiferal biostratigraphy, we determined the age of the samples to be 5.6 to 3.1 Ma. A total of 8314 otoliths were assigned to 64 different taxa from 33 families, including the discovery of one new genus, Gutingichthys gen. nov., and three new species: Benthosema duanformis sp. nov., Benthosema parafibulatum sp. nov., and Gutingichthys changi sp. nov. Comparisons with other regional otolith-based assemblages highlighted the exceptional diversity of our collection, making it the most diverse fossil fish fauna reported from Taiwan to date. Otolith diversity analysis revealed very few taxa were dominant in the assemblage, particularly the mesopelagic Myctophidae, with a wide variety of minor taxa. The co-occurrence of shallow-water elements suggests episodic storm events as a potential source. The predominance of deep-sea and oceanic fishes indicated an outer-shelf to upper slope environment, resembling the modern outer-shelf and upper slope fish fauna in the region. Our findings suggest an early establishment and persistent presence of the mesopelagic fish community since the Early Pliocene. Further investigations of the Upper Miocene and Pleistocene sections of the Gutingkeng Formation would provide valuable insights into the evolution of deep-sea fish fauna in the area.","PeriodicalId":56059,"journal":{"name":"Swiss Journal of Palaeontology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}