Cretaceous Research最新文献

{"title":"The earliest parasitoid beetle (Tenebrionoidea: Ripiphoridae) and an overview of Coleoptera from the Lower Cretaceous Crato formation","authors":"Jan Batelka ,&nbsp;Rolf G. Beutel ,&nbsp;Gabriel Biffi ,&nbsp;Anderson Lepeco","doi":"10.1016/j.cretres.2025.106198","DOIUrl":"10.1016/j.cretres.2025.106198","url":null,"abstract":"<div><div>A fossil beetle species from the Lower Cretaceous Crato Formation of northeastern Brazil is described. <strong>†<em>Cratovorus archaicus</em> gen. nov. et sp. nov.</strong> is assigned with confidence to the subfamily Ripidiinae, tribe Ripidiini, of the highly specialized tenebrionoid Ripiphoridae. It is the earliest known fossil of this family at present, and also the first described Mesozoic species of Tenebrionoidea from the Southern Hemisphere. Its specialized morphology is similar to extant males of Ripidiini and it shares several apomorphies with this tribe, which strongly suggests that <strong>†<em>Cratovorus archaicus</em> gen. nov. et sp. nov.</strong> had already parasitic larvae. It is also similar to some other Cretaceous genera of the family, which were likely associated with an extant lineage of Blattodea also found in the deposit. Endoparasitic development as implied by the placement in Ripidiinae makes this the earliest record of parasitoidism in Coleoptera. An annotated list of Coleoptera described from Crato Formation and those mentioned from this deposit as <em>nomina nuda</em> is provided. The importance of beetle species from Crato Formation for understanding the evolution of the represented lineages is discussed.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106198"},"PeriodicalIF":1.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588676","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":"Taphonomic patterns in lower cretaceous fish assemblages: Evidence from the Sergipe-Alagoas Basin, Brazil","authors":"Valéria Gallo ,&nbsp;Rafaela Petra ,&nbsp;Hanna Carolina Lins de Paiva ,&nbsp;Francisco J. de Figueiredo ,&nbsp;Hermínio Ismael de Araújo-Júnior","doi":"10.1016/j.cretres.2025.106195","DOIUrl":"10.1016/j.cretres.2025.106195","url":null,"abstract":"<div><div>Taphonomic processes affecting vertebrate remains vary across environments, resulting in preservation patterns typical of different physical settings. Fish taphonomy, in particular, provides valuable insights into limnology, community composition, life history, mortality, depositional conditions, and preservation mechanisms. However, most taphonomic studies on fossil fish have focused on lacustrine deposits, leaving marine deposits comparatively underexplored. Research on marine settings often emphasizes mortality causes, such as abrupt temperature changes, cold shocks, hypothermia, and low dissolved oxygen levels. The paleoichthyofauna of the Morro do Chaves Formation (MCF) is generally regarded as diverse, abundant, and well-preserved. Despite this, most previous studies have emphasized taxonomy and systematics, with limited focus on paleoecological and taphonomic aspects. This study addresses this gap through a comprehensive taphonomic analysis of the MCF fish assemblage, integrating the latest paleobiological, sedimentological and stratigraphic data. Qualitative and quantitative analyzes from 133 specimens revealed four distinct taphofacies distributed throughout the formation. The MCF represents a seasonal lacustrine paleoenvironment, as indicated by cyclic deposits of coquinas, shales, and sandstones, along with sedimentary structures such as mud cracks. Two distinct paleoenvironmental interpretations emerge for the MCF: the Sergipe portion represents the paleolake border, while the Alagoas portion corresponds to the more distal portion of the paleolake. The occurrence of fish remains spanning various ontogenetic stages, along with bioclasts aligned parallel to bedding planes, indicates minimal reworking, short transport distances, and non-selective mortality events. Furthermore, the presence of marine taxa in MCF indicates sporadic yet intense marine incursions in the northern Sergipe-Alagoas Basin during the Early Cretaceous.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106195"},"PeriodicalIF":1.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580689","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":"Crocodyliform remains from the Upper Cretaceous (Turonian) Tamagawa Formation, northeastern Japan with preliminary dietary reconstruction through dental microwear texture analysis","authors":"Kubo Tai ,&nbsp;Kodai Usami ,&nbsp;Ren Hirayama ,&nbsp;Masaya Iijima ,&nbsp;Daniela E. Winkler ,&nbsp;Ai Ito ,&nbsp;Hikaru Uno ,&nbsp;Shinya Miyata ,&nbsp;Mugino O. Kubo","doi":"10.1016/j.cretres.2025.106197","DOIUrl":"10.1016/j.cretres.2025.106197","url":null,"abstract":"<div><div>Here we describe recently recovered crocodyliform remains from the Tamagawa Formation of Kuji Group, Kuji city, northeastern Japan. The material comprises osteoderms, vertebrae, a frontal bone, and isolated teeth. The dorsal paravertebral osteoderms bear a sagittal keel on the posterior half of the element, extending to its caudal margin, which indicates the presence of paralligatorids within the Kuji crocodyliform assemblage. Further, the Kuji crocodyliform assemblage may have consisted of multiple taxa, as the frontal bone lacks the sagittal keel characteristic of paralligatorids. Contemporaneous paralligatorids have been reported from Northeastern China, Mongolia, and Uzbekistan. The discovery of a potential paralligatorid from Kuji, Japan, suggests that paralligatorids were widely distributed across Asia, from coastal to inland regions, during the Late Cretaceous. Furthermore, potential diets of taxa included in the crocodyliform assemblage from Kuji were estimated through dental microwear texture analysis. The dental microwear texture observed in Kuji specimens is distinct from that of piscivorous and small crocodylians (skull length &lt;20 cm), while comparable to that of large crocodylians consuming hard-objects (skull length &gt;20 cm). Considering the existence of a medium-sized species (3 m total length) in the crocodyliform assemblage from Kuji, their diet probably included mid to large sized tetrapods, such as turtles and dinosaurs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106197"},"PeriodicalIF":1.9,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605456","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":"Integrated stratigraphy and paleoceanography across the Santonian/Campanian boundary in the Budva Zone (Dinarides), Montenegro","authors":"Anja Kocjančič ,&nbsp;Maria Rose Petrizzo ,&nbsp;Aleksander Horvat","doi":"10.1016/j.cretres.2025.106194","DOIUrl":"10.1016/j.cretres.2025.106194","url":null,"abstract":"<div><div>This paper examines the 42 m thick Upper Cretaceous sedimentary succession of the Čanj section in the Budva Zone (Dinarides), Montenegro, with a focus on planktonic foraminifera and geochemical characteristics across the Santonian/Campanian boundary. The section features well-preserved red pelagic Scaglia-type limestones with occasional chert intercalations, similar to the Cretaceous Oceanic Red Beds (CORBs) observed worldwide. An integrated stratigraphic analysis, including biostratigraphy and chemostratigraphy, was conducted to identify isotopic signals and planktonic foraminiferal species that characterize this Tethyan facies, and to locate the Santonian/Campanian boundary. The lithostratigraphic framework of the section includes distinct members (RM1, RM2, and RM3), along with a notable White Member (WM) containing black chert layers. Stable isotopes (δ¹³C_carb and δ¹⁸O_carb) and elemental composition analyses on bulk carbonate samples reveal significant shifts in isotope ratios and element concentrations corresponding to lithologic transitions within the section. The occurrence of the planktonic foraminifera <em>Dicarinella asymetrica</em> in the WM marks an important biostratigraphic interval in the Santonian. The multiproxy approach revealed increased paleobioproductivity and a transgressive sea level phase in the WM during the Santonian in the western Tethys. Geochemical data suggest that the long-term sea-level rise was interrupted by smaller, short-term sea-level falls during the deposition of the studied pelagites. A comparative analysis with other Mediterranean CORBs and the Bottaccione section (Italy) highlights the regional significance of the Čanj sequence.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106194"},"PeriodicalIF":1.9,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588675","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":"Mono– to pauci-specific communities in the Upper Cretaceous of Wadi Qena, Egypt: The combined effect of food and oxygen deficiency","authors":"Omar El-Issawi ,&nbsp;Tarek Anan ,&nbsp;Heba El-Desouky ,&nbsp;Ahmed Abdelhady ,&nbsp;Hosni Hamama","doi":"10.1016/j.cretres.2025.106196","DOIUrl":"10.1016/j.cretres.2025.106196","url":null,"abstract":"<div><div>Understanding the dynamics of ancient marine systems is vital for assessing biodiversity changes in modern ecosystems. This study examines the paleoenvironments of the Upper Cretaceous deposits in the Wadi Qena region (Eastern Desert, Egypt), integrating lithofacies, biofacies, and taphofacies. Based on quantitative analyses of two sections, Wadi Hawashiya and Gabel Qreiya, four firm-bottom and two soft-bottom macrobenthic associations were identified. In Wadi Hawashiya, the <em>Nicaisolopha tissoti</em> association thrived in a shallow, moderate-energy inner ramp lagoonal environment of the Coniacian–Santonian, transitioning to high-energy shoals (calcareous quartz arenite). Two monospecific associations, <em>Pycnodonte</em> (<em>Ph.</em>) <em>vesicularis</em> and <em>Gyrosoria gracilis</em>, along with one pauci-specific <em>Porospherae globularis</em> association, were found in the Campanian–Maastrichtian. These associations indicate a shift to a deeper, outer low-energy ramp environment with a firm substrate and dysoxic, oligotrophic conditions. In Gabel Qreiya, the lower Campanian reflects low-energy tidal flats, while the upper Campanian–lower Maastrichtian contains the <em>Pycnodonte</em> (<em>Ph.</em>) <em>vesicularis</em> association, which lived in a low-energy, firm-bottom inner ramp lagoon. The upper Maastrichtian is dominated by the <em>Lyropecten</em> (<em>A</em>.) <em>acutiplicatus</em> association, which inhabited a deeper outer ramp environment with soft substrates and dysoxic, eutrophic conditions. Overall, the Coniacian–Santonian is marked by higher diversity, while the Campanian–Maastrichtian is characterized by reduced diversity and a dominance of suspension feeders. This shift is interpreted as the result of a combined effect of oxygen deficiency and food shortage, likely caused by a sudden deepening from inner ramp lagoons to outer ramp settings, alongside with declining trophic resources, and oxygen levels.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106196"},"PeriodicalIF":1.9,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580690","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 dentalite, Piscidenticulus callapezi igen. et isp. nov., on a crocodylomorph coprolite from the Upper Cretaceous of west-central Portugal","authors":"Ricardo J. Pimentel ,&nbsp;Adrian P. Hunt ,&nbsp;Fernando Barroso-Barcenilla ,&nbsp;Mélani Berrocal-Casero","doi":"10.1016/j.cretres.2025.106193","DOIUrl":"10.1016/j.cretres.2025.106193","url":null,"abstract":"<div><div>Recently discovered dentalites preserved on an Upper Cretaceous coprolite are described. The coprolite was likely produced by a crocodylomorph that lived in a shallow water, marginal environment along the West Iberian Margin. The specimen was collected from an uppermost middle Cenomanian carbonate-siliciclastic marine bed, at the base of the Tentúgal Formation (Tentúgal, west-central Portugal). The dentalites exhibit unique characteristics, including sets of straight, parallel, and equidistant grooves, with separations wider than the grooves, themselves. These features support the definition of the new ichnogenus and ichnospecies <em>Piscidenticulus callapezi</em>. The dentalites are interpreted as the result of repeated fish-biting behaviour on the surface of the coprolite, likely in an attempt to obtain food, providing significant data on the scarcely known palaeoethology of Cretaceous homodont marine fishes.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106193"},"PeriodicalIF":1.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523529","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":"First record of a lungfish (Sarcopterygii: Dipnoi) in the Upper Cretaceous of the Chubut Group, Golfo San Jorge Basin, Argentina. paleoenvironmental and paleoclimatic considerations","authors":"Gabriel A. Casal ,&nbsp;Karen M. Panzeri ,&nbsp;Bruno N. Alvarez ,&nbsp;Noelia V. Cardozo ,&nbsp;Julieta L. Caglianone ,&nbsp;Marcelo Luna ,&nbsp;Lucio M. Ibiricu","doi":"10.1016/j.cretres.2025.106192","DOIUrl":"10.1016/j.cretres.2025.106192","url":null,"abstract":"<div><div>Here, we describe a tooth plate (UNPSJB-PV 1047), from fluvial sandstones of the “middle section” of the Lago Colhué Huapi Formation exposed in the locality of “Playa Kruger” (Santonian?–lower Maastrichtian?), central Patagonia, Argentina. This a prearticular plate that has been assigned to the genus <em>Metaceratodus</em> and provisionally to the species <em>Metaceratodus kaopen</em>. Shared features include the presence of a lingual edge that tends to be straight and a medial edge that is slightly curved, a long first denticulation with a broad base and no deep wear facets, and an end of the first denticulation without the formation of sinuosities. However, this interpretation is not definitive given the morphological variation of tooth plates within the same species. UNPSJB-PV 1047 represents the first record of these lungfish in the Golfo San Jorge Basin, expanding the geographic distribution of this taxon in South America and contributing to interpretations of its living environment. Its presence increases biodiversity for the Lago Colhué Huapi Formation and supports interpretations of the sedimentary paleoenvironment in the “middle section” of the Lago Colhué Huapi Formation, characterized by fluvial systems that seasonally interrupted their discharge under a warm climate with dry periods, suggesting an optimal environment for the development of lungfish.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106192"},"PeriodicalIF":1.9,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491866","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":"Tithonian–Berriasian calpionellid and calcareous dinocyst biostratigraphy, and microfacies in the Torre de’ Busi section (Lombardian Basin, northern Italy)","authors":"Silviya Petrova ,&nbsp;Daniela Reháková ,&nbsp;Elisabetta Erba ,&nbsp;Jacek Grabowski","doi":"10.1016/j.cretres.2025.106180","DOIUrl":"10.1016/j.cretres.2025.106180","url":null,"abstract":"<div><div>Tithonian and lower Berriasian pelagic carbonate deposits of the Torre de’ Busi section (Lombardian Basin, northern Italy) were studied in detail in terms of their microfacies, calpionellid and calcareous dinocyst biostratigraphy, and integrated with calcareous nannofossils and magnetic stratigraphy.</div><div>Calpionellid zonation was revised, modifying the archival, unpublished data. Three calpionellid zones (Chitinoidella, Crassicollaria and Calpionella) and six subzones (<em>Longicollaria dobeni, Chitinoidella boneti, Tintinnopsella remanei</em>, <em>Crassicollaria intermedia</em>, <em>Calpionella alpina</em> and <em>Remaniella ferasini</em>) were identified, spanning from the topmost lower Tithonian to the lower Berriasian. Correlations between the calpionellid zones and magnetozones combined with calcareous nannofossil zones, are consistent with most Tethyan sections. The base of the <em>C. alpina</em> Subzone is quantitatively illustrated and based on high-resolution frequency analysis of calpionellid taxa.</div><div>Calcareous cysts were studied in the Torre de’ Busi section for the first time. Five calcareous dinoflagellate zones were distinguished. The lower Tithonian contains the <em>Committosphaera pulla</em>–<em>Carpistomiosphaera tithonica, Parastomiosphaera malmica</em> and the lowest part of <em>Colomisphaera tenuis</em> zones. In the upper Tithonian the <em>Colomisphaera tenuis</em>, <em>Colomisphaera fortis</em> and the lower part of <em>Stomiosphaerina proxima</em> zones were documented. The upper part of the <em>St</em>. <em>proxima</em> Zone is present in the lower Berriasian. The calcareous dinocyst zones and their correlation with magnetozones align well with available Tethyan records.</div><div>The Torre de’ Busi section represents a fully pelagic environment with a relatively large amount of radiolarians and sponge spicules. A major microfacies change, from radiolarian to calpionellid-dominated microfacies, occurs in the upper Tithonian (base of the <em>Cr</em>. <em>intermedia</em> Subzone, base M19r), close to the base of the Maiolica Formation. This level is characterized by a decrease in calcareous dinocyst frequencies, and an increase in calpionellids, which correlates with a major speciation phase of nannoconids.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106180"},"PeriodicalIF":1.9,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480263","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":"Pneumatic structures of sauropod cervical vertebrae from the Lower Cretaceous Sao Khua Formation of northeastern Thailand","authors":"Kasidit Eiamlaor ,&nbsp;Suravech Suteethorn ,&nbsp;Phornphen Chanthasit ,&nbsp;Varavudh Suteethorn ,&nbsp;Kantapon Suraprasit","doi":"10.1016/j.cretres.2025.106189","DOIUrl":"10.1016/j.cretres.2025.106189","url":null,"abstract":"<div><div>Internal structures of sauropod vertebrae are hollowed out by pneumatic diverticular systems similar to extant birds. Their vertebral columns contain extensive air sac systems that are highly prominent in the cervical regions. Here we analyze the pneumatic structures in the cervical vertebrae of two sauropod taxa: <em>Phuwiangosaurus sirindhornae</em> and a diplodocoid sauropod, from the Lower Cretaceous Sao Khua Formation of northeastern Thailand, using a CT-scan technique. The internal pneumatic structures of <em>P. sirindhornae</em> mainly consisted of camerae within the centrum and systems of camellae in the articulation regions, representing a semicamellate pattern. The diplodocoid sauropod exhibited a camerate pattern with its centrum filled with only pneumatic camerae. The semicamallate pattern of <em>Phuwiangosaurus sirindhornae</em> is similar to that of <em>Brachiosaurus</em> sp. and <em>Giraffatitan brancai,</em> differing from previous interpretations that suggested a close relationship to somphospondyls. Due to the more primitive internal structures of <em>Phuwiangosaurus</em><em>sirindhornae</em>, we instead propose that <em>Phuwiangosaurus</em> is a non-somphospondyl titanosauriform more closely related to brachiosaurids. In the Sao Khua diplodocoid sauropod, the vertebral pneumatization was much higher than in dicraeosaurids but less intense than in most neosauropods. The presence of a semicamellate pattern in <em>Phuwiangosaurus</em> extends the temporal range of such a condition to the Early Cretaceous, while the camerate pattern of the Sao Khua diplodocoid suggests that Cretaceous dicraeosaurids likely had a varying degree of pneumaticity, which might have evolved independently in their lineages.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106189"},"PeriodicalIF":1.9,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144492176","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":"Side by side with titans: A new rebbachisaurid dinosaur from the Huincul Formation (upper Cenomanian) of Patagonia, Argentina","authors":"Flavio Bellardini ,&nbsp;Leonardo S. Filippi ,&nbsp;José L. Carballido ,&nbsp;Alberto C. Garrido ,&nbsp;Mattia A. Baiano","doi":"10.1016/j.cretres.2025.106188","DOIUrl":"10.1016/j.cretres.2025.106188","url":null,"abstract":"<div><div>Rebbachisaurids are medium to large-sized, non-selective and ground-level browser diplodocoid sauropods, and they are characterised by highly specialised skulls, widely pneumatized axial elements and gracile appendicular skeletons. Known from the Early Cretaceous to the early Late Cretaceous, the rebbachisaurid fossil record is particularly diversified in Gondwana, with several specimens found in North Africa and South America. Notably, Patagonia has yielded over more than half of all known Rebbachisauridae, including the most basal forms and the youngest rebbachisaurid remains to date. Herein, we describe a new species of Rebbachisauridae from the Huincul Formation (upper Cenomanian) of the Neuquén Basin (Patagonia, Argentina): <em>Astigmasaura genuflexa</em> gen. et sp. nov. New laboratory work provided the complete osteology of the specimen MAU-Pv-EO-629, complementing the previously published hind limb anatomy. Thus, the type material of <em>Astigmasaura</em> comprises the posterior portion of an articulated, postcranial skeleton of a single, morphologically adult individual. <em>Astigmasaura</em> shares different conditions with other Rebbachisauridae, including anterior caudal vertebrae with tall neural spines and tetraradiate neural laminae, asymmetric middle haemal arches, mediolaterally compressed proximal tibiae, and femur with medially inclined distal condyles. Furthermore, <em>Astigmasaura</em> shows a unique combination of diagnostic features that distinguish it from all other sauropods. This new record not only provides new morphological information about the caudal and pelvic girdle anatomy of Rebbachisauridae, which is poorly known to date, and suggests a greater taxonomic diversification within the family during the last stages of its evolutionary history than known before.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"176 ","pages":"Article 106188"},"PeriodicalIF":1.9,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480260","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}