Cretaceous Research最新文献

{"title":"First Valanginian (Early Cretaceous) ornithopod (Dinosauria, Ornithischia) from Patagonia","authors":"R.A. Coria ,&nbsp;I.A. Cerda ,&nbsp;F. Escaso ,&nbsp;M.A. Baiano ,&nbsp;F. Bellardini ,&nbsp;A. Braun ,&nbsp;L.M. Coria ,&nbsp;J.M. Gutierrez ,&nbsp;D. Pino ,&nbsp;G.J. Windholz ,&nbsp;P.J. Currie ,&nbsp;F. Ortega","doi":"10.1016/j.cretres.2024.106027","DOIUrl":"10.1016/j.cretres.2024.106027","url":null,"abstract":"<div><div>Here we describe a new ornithopod species, <em>Emiliasaura alessandrii</em> gen. et sp. nov. from Valanginian rocks (Early Cretaceous) of northwestern Patagonia. This new taxon exhibits affinities with the Rhabdodontomorpha and is primarily represented by two specimens of mid-sized ornithopods collected from different sites and stratigraphical levels of the Mulichinco Formation. The holotype specimen MLL-Pv-001 includes the coracoid, the proximal end of a scapula, a humerus and a complete right hind limb, whereas the paratype specimen MLL-Pv-006 preserves vertebral elements, haemal arches, an incomplete pelvis, and nearly complete hind limbs. The new taxon has an anteroposteriorly elongate ilium with a sigmoidal dorsal border and broad brevis shelf, a femur shaft with an extensive, mid-shaft positioned fourth trochanter, and a second pedal digit with a short, robust, blunt ungual phalanx similar to those in Ankylopollexia ornithopods. The new ornithopod taxon formed part of a diverse dinosaur association from the Mulichinco Fm that includes dicraeosaurid sauropods and carcharodontosaurid theropods, and represents the first South American record of a rhabdodontomorph, and the oldest and most primitive representative of this clade.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106027"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537953","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}

{"title":"A new crossognathiform fish (Teleostei: †Crossognathiformes) from San José de Gracia quarry reveals a great diversity in the Cretaceous outcrops of Mexico","authors":"Carlos Iván Medina-Castañeda ,&nbsp;Kleyton Magno Cantalice ,&nbsp;Carlos Castañeda-Posadas","doi":"10.1016/j.cretres.2024.106026","DOIUrl":"10.1016/j.cretres.2024.106026","url":null,"abstract":"<div><div>We describe a new species, †<em>Buapichthys gracilis</em> gen. et sp. nov., based on two specimens from the Turonian deposits of the San José de Gracia quarry, Molcaxac, Puebla, central Mexico. Osteological features show this new species belongs to the order †Crossognathiformes, nesting within the suborder †Pachyrhizodontoidae. The combination of features, such as a slender body, the head with cephalic spines, three hypertrophied postcleithra, the pelvic fin posterior to the dorsal fin, the first and last dorsal pterygiophores modified into scutes, and the dorsal fin bony projections shows that †<em>Buapichthys gracilis</em> gen. et sp. nov. is different from other crossognathiform. This new taxon represents an increase in the group's diversity, constituting the seventh species of the order †Crossognathiformes reported in Mexico. Evaluating the crossognathiform biodiversity over time indicates that the great crossognathiform diversification occurred during the Albian until the Turonian. The Mexican fossil record significantly contributes to this diversity, with about 18 % of the species recognized for this period.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106026"},"PeriodicalIF":1.9,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531014","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}

{"title":"Albian–Cenomanian echinoids from areas north of Bandar Abbas and south of Fars in the Zagros Mountains, Iran","authors":"Hossein Gholamalian ,&nbsp;Mohamad Kazem Kamali ,&nbsp;David A. Wood","doi":"10.1016/j.cretres.2024.106021","DOIUrl":"10.1016/j.cretres.2024.106021","url":null,"abstract":"<div><div>Fossil echinoids have rarely been described from Iran. This study focuses on the echinoid fauna found in the Cretaceous strata (Kazhdumi Formation) of the Geno and Gerash sections in the Bandar Abbas and Fars areas of the Zagros Mountains, southern Iran. The age of the Kazhdumi Formation in both sections is determined to be Albian-Cenomanian based on the associated ammonites and microfauna, its stratigraphic position, and previous studies on this formation. Twenty-one echinoid species (twelve regular and nine irregular) belonging to seventeen genera were described in this study. Fourteen of these species are reported for the first time from Iran. In addition, a new diadematoid echinoid species, <em>Arabicodidema jafariani</em> sp. nov. is introduced. New age ranges are proposed for <em>Pliotoxaster comanchei</em> and <em>Lambertiaster douvillei</em>. The paleogeographic position of the Zagros Basin in the Tethyan realm is confirmed based on the distribution of the index species.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106021"},"PeriodicalIF":1.9,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554277","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}

{"title":"The ankylosaurid neomorphic skull elements","authors":"Paul Penkalski","doi":"10.1016/j.cretres.2024.106020","DOIUrl":"10.1016/j.cretres.2024.106020","url":null,"abstract":"<div><div>Ankylosaurids but not nodosaurids possess a suite of neomorphic elements fused to the posterior border of the skull roof. Previous authors have offered conflicting descriptions of these elements, leading to ongoing confusion over their morphology, developmental origin, and homologies. They have been described both as secondary dermal additions and as outgrowths of known skull elements. However, they are demonstrably neomorphic and were incorporated into the skull early in ankylosaurid evolution. The six elements—three per side—are herein termed the supranuchal, postsquamosal, and postquadratojugal and form the posterior margin of the skull on each side (in some taxa, the parietal also reaches the posterior border). They do not overlie the squamosal or quadratojugal but rather articulate with them. Other neomorphic elements including the supraorbitals and supranarial ossifications have been described previously. The squamosal proper is a small element in the skull roof with a well-defined cotylus ventrally for articulation with the quadrate. The three neomorphs likely originated as a cervical half-ring or simply as a series of six cervical osteoderms situated just posterior to the skull in ancestral ankylosaurs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106020"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531012","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}

{"title":"Upper Cretaceous sauropod dinosaur tracks, palaeosols, and sedimentary deposits - Bauru Group, southeastern Brazil","authors":"Emerson Ferreira de Oliveira ,&nbsp;Silvina de Valais ,&nbsp;Alessandro Batezelli ,&nbsp;Carlos Roberto Candeiro","doi":"10.1016/j.cretres.2024.106017","DOIUrl":"10.1016/j.cretres.2024.106017","url":null,"abstract":"<div><div>The Upper Cretaceous period is known in international literature for its rich diversity of terrestrial life. There is a lot of research on sedimentary deposits and the preservation of vertebrate and invertebrate fossils therein. Another essential data contribution to scientific research is the diagnostic characteristics of palaeosol profiles, such as horizons, structures, and root traces. This research found records of palaeosols, sedimentary deposits, and dinosaur tracks in a single outcrop. The palaeosols were analysed based on macro and micromorphological data. They have Bt and C horizons, and it was possible to reconstruct the pedosedimentary development of composite palaeosols. Facies analysis and interpretation of the depositional environment were carried out to identify and interpret the sediments. These are parallel bedding sedimentary structures with alternation of fine sand and clay. The tracks -bearing layers are tabular, parallel bedding sedimentary structures with fine sand and clay alternation. The tracks in the field were identified according to width, depth, morphology, and dimension, so it was possible to define the moulds and casts. At least nineteen concave structures in four different layers were interpreted as cross-sections of dinosaur tracks, with some preserved at the top of the analysed outcrop. Dinosaur tracks depend on specific conditions to be preserved in the geological record, such as plasticity and consistency of the sediments and the depositional environment. Another series of factors must also be considered, such as how and why these animals came to this place. The palaeosols indicate topographic stability for a period sufficient for the pedogenesis process, while the parallel beddings preserved at the top of the section represent instability of the relief with insufficient time for soil development. Thus, the plasticity in the sediments made it possible to record the tracks. This research contributes to the palaeoecological and environmental reconstruction of the landscape through the use of palaeosols, sediments, and dinosaur tracks records.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106017"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440967","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}

{"title":"New evidence of the global distribution of the swordfish-like pachycormid Protosphyraena in the late Early Cretaceous and a review of global records of the genus","authors":"Alina Kanarkina ,&nbsp;Nikolay Zverkov ,&nbsp;Irina Polyakova","doi":"10.1016/j.cretres.2024.106019","DOIUrl":"10.1016/j.cretres.2024.106019","url":null,"abstract":"<div><div><em>Protosphyraena</em> is one of the most widespread Cretaceous actinopterygian genera, with numerous species described primarily from the Upper Cretaceous of North America and Western Europe. However, most of the species are known from fragmentary and anatomically non-overlapping material, making the alpha taxonomy of this genus extremely problematic. Here we describe the first finds of <em>Protosphyraena</em> from the Albian of the Caucasus, and reassess the historical specimens from the Cenomanian of the Kursk Region of Russia. In an attempt to assign Russian specimens to a particular species, we review the global records and tangled taxonomy of <em>Protosphyraena</em>. The type species, <em>P</em>. <em>ferox</em>, is unambiguously known from teeth, cranial fragments and mandibles. The posteriorly directed rostral teeth of the type species cast doubt on the validity of <em>Australopachycormus</em> originally erected based on this feature. Our observations support the assignments of the historical Russian Cenomanian specimens to <em>P. ferox</em> and <em>P. tenuirostris</em>. We do not find sufficient cause to refer all isolated fins from Europe to <em>P. ferox</em>, as suggested by recent research. Instead, the species initially proposed by Agassiz for isolated fins from the English Chalk are available, and the fins of <em>Protosphyraena</em> from the Caucasus are consistent with one of these species, <em>Protosphyraena gibberula</em> comb. nov. Our findings indicate that <em>Protosphyraena</em> was widespread already in the late Early Cretaceous. Moreover, the youngest occurrence of <em>Protosphyraena</em> in Europe, a pectoral fin from the Maastrichtian of Belgium, demonstrates unique features and is thus referred to a new species, <em>Protosphyraena terminata</em> sp. nov.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106019"},"PeriodicalIF":1.9,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531013","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}

{"title":"Colonisation of disturbed deltaic paleoenvironments from the Early Cretaceous (Albian): Inferences from an exceptional record of the fern Ruffordia goeppertii (Dunker) Seward from northeastern Spain","authors":"Luis M. Sender ,&nbsp;Uxue Villanueva-Amadoz ,&nbsp;Torsten Wappler ,&nbsp;José B. Diez ,&nbsp;Alberto Cobos","doi":"10.1016/j.cretres.2024.106018","DOIUrl":"10.1016/j.cretres.2024.106018","url":null,"abstract":"<div><div>Exquisitely well-preserved records of a nearly monospecific assemblage of in situ specimens in growth position of the fern <em>Ruffordia goeppertii</em> from the Albian deposits of northeastern Spain, clarify Early Cretaceous continental paleoenvironments during a key epoch of floral evolution during the Cretaceous Terrestrial Revolution. These macro and microfossils of vegetative and fertile organs are preserved in connexion with their rhizomes, and spores are retained within sporangia. This assemblage contains the first records of this iconic Cretaceous fern from the Albian of Spain. The fossils also fill a temporal and geographical gap in the distribution of this taxon in southwestern Eurasia during an interval of rapid floristic and faunal changes, globally. The biostratinomy of these fossils aid reconstruction of the paleoenvironments in which this type of ferns developed, and indicates that disturbed deltaic floodplains were colonised by <em>Ruffordia</em> in southwestern Eurasia during the Albian. Moreover, the presence of plant-insect interaction traces on this fern and the relationship of this plan fossil assemblage with evidence of herbivorous dinosaur tracks provides insights into the possible feeding strategies of these animals in deltaic-estuarine environments during the late Early Cretaceous in southwestern Eurasia.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106018"},"PeriodicalIF":1.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446810","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}

{"title":"Sedimentary organic matter and paleoenvironmental reconstruction of the Santana Group (Lower Cretaceous), Araripe Basin, Northeast Brazil","authors":"Juan David Vallejo ,&nbsp;Regina Buarque de Gusmão ,&nbsp;Marcelo de Araujo Carvalho ,&nbsp;Claus Fallgatter ,&nbsp;Enelise Katia Piovesan","doi":"10.1016/j.cretres.2024.106016","DOIUrl":"10.1016/j.cretres.2024.106016","url":null,"abstract":"<div><div>Depositional controls of the Santana Group in the Araripe Basin are still being debated. The main controversial subject is their marine influence and paleoenvironmental evolution. In this study, palynofacies analysis was performed on 59 samples from one core drilled at Sítio Romualdo in the Araripe Basin to investigate sedimentary organic matter. Three palynofacies associations (structureless, continental particles, and aquatic + opaque) were identified. The Santana Group consist of Barbalha, Crato, Ipubi and Romualdo formations. Based on palynofacies associations we conclude that the depositional setting of the Barbalha Formation reflects a fluvially-fed lacustrine system under oxic conditions. The Crato Formation, associated with tidal flats, coastal lakes, and lagoons within an open bay environment, represents a bayhead delta system. The Ipubi Formation corresponds to a coastal plain typical of sabkha paleoenvironments, characterized by low energy under reducing conditions, during drier climate conditions. The Romualdo Formation records mainly an estuarine paleoenvironment characterized by dysoxic to anoxic conditions. The presence of palynomorph groups typifies a late Aptian age for the Santana Group, which is based on the range of guide species marked mainly by the presence of <em>Sergipea variverrucata</em> biozone (P-270), as well as the occurrence of <em>Complicatisaccus cearensis</em> and <em>Equisetosporites maculosus</em>. The identification of marine palynomorphs (dinoflagellate cysts <em>Subtilisphaera</em> and foraminiferal test linings) are indicative of several, local marine incursions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106016"},"PeriodicalIF":1.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441041","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}

{"title":"A new ornithocheirid pterosaur (Pterosauria: Ornithocheiridae) from the mid-Cretaceous Ifezouane Formation, Kem Kem Group of Morocco","authors":"Megan L. Jacobs ,&nbsp;Roy E. Smith ,&nbsp;Samir Zouhri","doi":"10.1016/j.cretres.2024.106015","DOIUrl":"10.1016/j.cretres.2024.106015","url":null,"abstract":"<div><div>A new ornithocheirid pterosaur, <em>Akharhynchus martilli</em> gen. et. sp. nov. from the Ifezouane Formation, Kem Kem Group of Morocco is described, based on a well-preserved anterior rostrum fragment. It is assigned to a new genus based on one autapomorphy and a unique combination of synapomorphies, including the following: the medial rims of the first alveoli pair contact each other and the first alveoli pair are 50% smaller than the second alveoli pair. Comparative anatomy and a phylogenetic analysis demonstrate that <em>Akharhynchus</em> has affinities with <em>Tropeognathus</em> within Tropeognathinae.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106015"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"A new gansuid bird (Avialae, Euornithes) from the Lower Cretaceous (Aptian) Jiufotang Formation of Jianchang, western Liaoning, China","authors":"Xuri Wang ,&nbsp;Andrea Cau ,&nbsp;Yinuo Wang ,&nbsp;Martin Kundrát ,&nbsp;Guili Zhang ,&nbsp;Yichuan Liu ,&nbsp;Luis M. Chiappe","doi":"10.1016/j.cretres.2024.106014","DOIUrl":"10.1016/j.cretres.2024.106014","url":null,"abstract":"<div><div>The study of the Cretaceous birds closest to the living euornithine species has mainly focused on the evolutionary patterns leading to the modern group. Yet, the morphological and ecological diversity of the euornithine branches not directly ancestral to the crown-group is probably underestimated. A new euornithine bird, <em>Shuilingornis angelai</em> gen. et sp. nov., is erected based on a nearly complete skeletal material from the Early Cretaceous (Aptian) Jehol Biota in western Liaoning, China. The new taxon is similar to the penecontemporary gansuids, yet it differs in the smaller body size and in the retention of plesiomorphic features widespread among non-gansuid euornithines. The osteohistological analysis indicates that <em>Shuilingornis</em> gen. nov. represents an early adult stage at the time of death. The phylogenetic analysis robustly supports the referral of <em>Shuilingornis</em> gen. nov. to Gansuidae. Except for the controversial <em>Hollanda</em>, the gansuids have been uncovered from four Aptian basins deposited under similar paleoclimatic conditions. Gansuid success in the middle part of the Cretaceous demonstrates that the exploration of semi-aquatic ecologies was a consistent euornithine pattern which preceded the later ornithurine radiation.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"166 ","pages":"Article 106014"},"PeriodicalIF":1.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}