Cretaceous Research最新文献

{"title":"New records of frogs (Anura, Lissamphibia) from the Late Cretaceous Bauru Group of Brazil and its paleobiogeographic implications","authors":"Fellipe Muniz ,&nbsp;Ariovaldo Giaretta ,&nbsp;Thiago S. Fachini ,&nbsp;Thiago da Silva Marinho ,&nbsp;Pedro Buck ,&nbsp;Sabrina Rodrigues ,&nbsp;Agustín G. Martinelli","doi":"10.1016/j.cretres.2025.106150","DOIUrl":"10.1016/j.cretres.2025.106150","url":null,"abstract":"<div><div>South America hosts one of the largest diversities of living frogs in the world, but our knowledge of the group during the Mesozoic Era is still limited. The Upper Cretaceous Bauru Group, in the south-central region of Brazil, has yielded a variety of vertebrate groups. Frog records are rare and restricted to a few well-preserved skeletons and fragmentary material. Nevertheless, they have offered important clues about the early diversification and distribution of frogs, especially among the speciose clade Neobatrachia. Here, we report new records of frogs from the Adamantina and Serra da Galga formations. The described specimens expand the geographical range of frogs in the Bauru Group and corroborate the hypothesis of a widespread distribution of neobatrachians in Gondwana landmasses by the Late Cretaceous. The discovery of the first putative <em>Calyptocephalella</em>-like form from a northern region in South America sheds light on the proposed biogeographic provincialism of frog faunas in South America by the Late Cretaceous.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106150"},"PeriodicalIF":1.9,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923838","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":"Isolated theropod teeth from the Upper Jurassic to Lower Cretaceous Khorat Group: Implications for theropod diversity in Thailand","authors":"Wongwech Chowchuvech ,&nbsp;Sita Manitkoon ,&nbsp;Phornphen Chanthasit ,&nbsp;Duangsuda Chokchaloemwong ,&nbsp;Wachirawit Kosulawatha ,&nbsp;Chatchalerm Ketwetsuriya","doi":"10.1016/j.cretres.2025.106147","DOIUrl":"10.1016/j.cretres.2025.106147","url":null,"abstract":"<div><div>Isolated theropod teeth are notably abundant of vertebrate remains within the Upper Jurassic to Lower Cretaceous Khorat Group of Thailand. However, despite the discovery of numerous dental materials, only a limited number of studies have focused on the morphology and taxonomy of these isolated teeth. This study investigated 112 isolated theropod teeth were retrieved from 19 localities on the Khorat Plateau in Northeastern Thailand. These teeth were divided into five morphotypes based on dental characteristics. They were identified based on cladistic and discriminant analyses that recovered four clades of theropod dinosaurs: Metriacanthosauridae, Tyrannosauroidea, Spinosauridae, and Allosauria. This dental evidence provide significant insights into the theropod diversity in Thailand during the Late Jurassic to Early Cretaceous. Specifically, the Late Jurassic to Early Cretaceous Phu Kradung Formation revealed an extended presence of metriacanthosaurids and basal tyrannosauroids, while the Sao Khua and Khok Kruat Formations indicated a shift towards allosaurian and spinosaurid dominance during the Early Cretaceous. The absence of metriacanthosaurids and basal tyrannosauroids in later formations suggests a faunal turnover, with allosaurians and spinosaurids becoming more prevalent, aligning with the changes in theropod faunal composition across Eurasia. Furthermore, this contribution suggested the faunal turnover pattern in the Eurasian theropods during the Jurassic-Cretaceous boundary interval, which might have been related to the change in herbivorous dinosaurs during this crucial timeframe of dinosaur evolution.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106147"},"PeriodicalIF":1.9,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935610","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 sharks in a chondrichthyan fauna from the Upper Cretaceous Aguja Formation (lower Campanian) of West Texas support biogeographic segregation among chondrichthyans in the Western Interior","authors":"Steven L. Wick ,&nbsp;Thomas M. Lehman","doi":"10.1016/j.cretres.2025.106151","DOIUrl":"10.1016/j.cretres.2025.106151","url":null,"abstract":"<div><div>A new, oral tooth-based chondrichthyan fauna consisting of 16 species is reported, two of which, <em>Lonchidion conrugis</em> sp. nov. and <em>Restesia corricki</em> sp. nov. are described for the first time. The present work compliments previous descriptions of other vertebrate groups from the early Campanian, Lowerverse microfossil locality in the Abajo Shale Member of the Aguja Formation of West Texas. This local fauna accumulated in a brackish water intertidal depositional setting, and differs significantly from the paracontemporaneous Ten Bits chondrichthyan assemblage found in overlying nearshore marine deposits of the Aguja Formation. The Lowerverse fauna exhibits a comparatively greater diversity and greater relative abundance of hybodont and orectolobiform sharks, but comparatively lower diversity and lower abundance of lamniform sharks compared to the Ten Bits fauna. The most abundant sharks in the Ten Bits fauna (<em>Scapanorhynchus</em>, <em>Squalicorax</em>, and <em>Serratolamna</em>) are rare or absent in the Lowerverse fauna. Rays and sawfishes are also more diverse and more abundant in the Ten Bits fauna, but the most common taxa in the Lowerverse fauna (<em>Cristomylus</em>, <em>Texatrygon</em>) are absent or very rare at Ten Bits. The Lowerverse assemblage is unique among paracontemporaneous Santonian–early Campanian chondrichthyan faunas in the Western Interior of North America in the presence of <em>Restesia</em>. Several taxa (<em>Scapanorhynchus</em>, <em>Rhombodus</em>) are found only in the southernmost of these faunas, and others (<em>Cantioscyllium</em>, <em>Columbusia</em>, <em>Cristomylus</em>, <em>Ptychotrygon</em>, and <em>Texatrygon</em>) are found only as far north as Utah. The Lowerverse chondrichthyan fauna supports regional segregation of some chondrichthyan species in the Western Interior during this time.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106151"},"PeriodicalIF":1.9,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929299","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 discoveries of lepidosteoid scales from the Upper Cretaceous in Songliao Basin, China","authors":"Zhaoqing Liu ,&nbsp;Wenhao Wu ,&nbsp;Xiaobo Li ,&nbsp;Li Yang","doi":"10.1016/j.cretres.2025.106149","DOIUrl":"10.1016/j.cretres.2025.106149","url":null,"abstract":"<div><div>This study explores the morphological and histological characteristics of isolated rhomboid scales recovered from the Late Cretaceous Nenjiang Formation in Northeast China. Six distinct scale morphotypes were identified and compared with scales of various Holostei taxa. Macroscopic observations reveal that most scale exhibit small or completely absent peg-and-socket articulations and lack of tubercles and denticles. Histologically, these scales display lepidosteoid-type ganoid scale characteristics: a multi-layered enameloid layer forms the ganoine covering, which overlies the isopedine layer. The isopedine layer is densely penetrated by numerous Williamson’s canals and contains abundant well-developed osteocyte lacunae. Although these isolated scale fossils resemble primitive Holostei scales, they cannot be confidently assigned to any known neopterygian taxa. The detailed morphological and histological analyses of these isolated Cretaceous scale fossils provide more precise data, advancing our understanding of Mesozoic fish diversity and evolutionary trends in the Songliao Basin.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106149"},"PeriodicalIF":1.9,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918556","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":"Ammonoids and inoceramid bivalves from the Upper Cretaceous shallow marine deposits of Taneichi Formation in Hirono Town, Iwate Prefecture, northeastern Japan: Implication for biostratigraphy","authors":"Daisuke Aiba ,&nbsp;Takafumi Mochizuki","doi":"10.1016/j.cretres.2025.106148","DOIUrl":"10.1016/j.cretres.2025.106148","url":null,"abstract":"<div><div>We examined 47 specimens of ammonoid and inoceramid bivalves from the Cretaceous Taneichi Formation in Iwate Prefecture, northeastern Japan and assigned them to seven species of ammonoids and two species of inoceramids. Of these, five species of ammonoids, <em>Protexanites</em> (<em>Anatexanites</em>) <em>fukazawai</em> (Yabe and Shimizu, 1925); <em>Eubostrychoceras valdelaxum</em> Aiba, Yamato, Kurihara, and Karasawa, 2017; <em>Hyphantoceras transitorium</em> Matsumoto, 1977; <em>Polyptychoceras yubarense</em> (Shimizu, 1935); and <em>Po</em>. <em>obatai</em> (Matsumoto, 1977); and one species of inoceramid, <em>Platyceramus japonicus</em> (Nagao and Matumoto, 1940) are reported for the first time from this Formation. The inoceramid <em>Pl</em>. <em>japonicus</em> and a few biostratigraphically informative ammonoids indicate that the middle Member of the Taneichi Formation was deposited in Santonian–early Campanian (Late Cretaceous). Ammonoid species found in the Taneichi Formation were generally similar to those of the Santonian–lower Campanian in other regions of the northwestern Pacific. Heteromorph taxa were the most abundant ammonoids, accounting for approximately 70 % of the total. Additionally, it is notable that “Leiostraca” taxa, such as Tetragonitoidea and Desmoceratoidea, were not included in the examined specimens. These patterns of occurrence might suggest the palaeoecology of ammonoids, but determining whether they reflect the true distribution requires verification of taphonomic processes, such as post-mortem drifting.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"175 ","pages":"Article 106148"},"PeriodicalIF":1.9,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911624","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":"Angiosperm fossil woods, Cryptocaryeae (Lauraceae) and Cunoniaceae, with marine borers from Day Nunatak, Western Antarctica (Snow Hill Island Formation, Upper Cretaceous)","authors":"Roberto R. Pujana ,&nbsp;María B. Santelli ,&nbsp;Maximiliano J. Alvarez ,&nbsp;María E. Raffi ,&nbsp;Sergio N. Santillana","doi":"10.1016/j.cretres.2025.106146","DOIUrl":"10.1016/j.cretres.2025.106146","url":null,"abstract":"<div><div>We describe three fossil woods from Day Nunatak, Snow Hill Island collected from outcrops of the Snow Hill Island Formation (Campanian–Maastrichtian). The first specimen is assigned to <em>Longexylon oliveroi</em> gen. et sp. nov., a Cryptocaryeae (Lauraceae), which suggests an Antarctic origin of the <em>Beilschmiedia-Cryptocarya</em> clade. The second specimen is assigned to <em>Eucryphiaceoxylon eucryphioides</em>, which increases the number and biogeographical range of this common fossil-species of Antarctica and Patagonia. The third specimen, less well preserved, is tentatively assigned to the same fossil-species as the second. The three specimens show evidence of biodeterioration by marine wood borers assigned to the ichnospecies <em>Apectoichnus longissimus</em> and <em>Teredolites clavatus.</em> Some <em>T. clavatus</em> borings had subsequent colonization by marine agglutinating organisms. Two borings of one specimen preserved the valves of the borer organism, probably a pholadoid bivalve.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106146"},"PeriodicalIF":1.9,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902073","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":"Turtles of the Aguja and Javelina formations, Upper Cretaceous (Campanian – Maastrichtian), west Texas","authors":"Thomas M. Lehman ,&nbsp;Susan L. Tomlinson ,&nbsp;Thomas A. Shiller II ,&nbsp;Steven L. Wick","doi":"10.1016/j.cretres.2025.106145","DOIUrl":"10.1016/j.cretres.2025.106145","url":null,"abstract":"<div><div>Freshwater turtles of the Aguja and Javelina formations include <em>Basilemys</em>, <em>Adocus</em>, <em>Compsemys</em>, and <em>Aspideretoides</em> which are widely distributed and have long ranges throughout Campanian-Maastrichtian strata in the Western Interior of North America. Several species with restricted ranges are however documented for the first time, including <em>Neurankylus baueri</em>, <em>Denazinemys nodosa</em>, and <em>Thescelus rapiens</em>. Fragmentary specimens also record an unidentified baenid, likely kinosternoids and chelydrids, and three trionychids other than cf. <em>Aspideretoides</em> spp. Specimens attributed to <em>Neurankylus baueri</em> are among the largest known. A <em>Neurankylus</em> specimen from the Javelina Formation likely represents a distinct unnamed late Maastrichtian species. <em>Thescelus rapiens</em> is reported for the first time outside of New Mexico. <em>Denazinemys</em> occurs throughout the Upper Cretaceous section, with the most complete specimens attributed to <em>D. nodosa.</em> The <em>Denazinemys</em> lineage was restricted to the southern part of the Western Interior throughout its history, and survived into late Maastrichtian time only in Texas. The Campanian turtle fauna is allied with those of northern Mexico, New Mexico, and Utah in the presence of bothremydids along with the baenids <em>N. baueri</em>, <em>D. nodosa</em>, and <em>T. rapiens</em>; together these comprise a distinct ‘southern’ Campanian assemblage. Maastrichtian turtles comprise a lower diversity fauna of mostly cosmopolitan taxa, as is also the case in correlative strata in New Mexico and Utah. This may reflect drier inland habitats represented in these ‘southern’ deposits, compared to coastal habitats that hosted a diverse endemic turtle fauna at northern sites bordering the remnant interior seaway at the end of Cretaceous time.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106145"},"PeriodicalIF":1.9,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143870057","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":"Maastrichtian climate of southern Patagonia (Argentina): An approach from paleosols of the dinosaur-bearing Chorrillo Formation","authors":"M. Sol Raigemborn ,&nbsp;Sabrina Lizzoli ,&nbsp;Damián Moyano-Paz ,&nbsp;Augusto N. Varela ,&nbsp;Daniel G. Poiré ,&nbsp;Valeria S. Perez Loinaze ,&nbsp;Ezequiel I. Vera ,&nbsp;Makoto Manabe ,&nbsp;Takanobu Tsuihiji ,&nbsp;Takashi Sano ,&nbsp;Fernando E. Novas","doi":"10.1016/j.cretres.2025.106144","DOIUrl":"10.1016/j.cretres.2025.106144","url":null,"abstract":"<div><div>The upper Maastrichtian dinosaur-bearing Chorrillo Formation in southern Patagonia (∼50° S, Austral-Magallanes Basin, Argentina) preserves successions of paleosols dominated by vertic features (i.e., the Argentino Lake hydromorphic Vertisols, the Perito Moreno Glacier calcic Vertisols, the Anita Farm Vertisols, the Centinela River Histosols, and the Chorrillo Malo Farm argillic Vertisols). To shed new light on and improve our understanding of the climate conditions that prevailed in southern Patagonia prior to the K/Pg extinction event, we used bulk geochemistry of the Chorrillo Formation paleosols to quantitatively reconstruct the latest Cretaceous climate at mid–high paleolatitudes of the Southern Hemisphere and compare them with late Maastrichtian global climate data derived from paleosols-based geochemical records. Bulk geochemical data indicate that pedogenesis occurred under moderate chemical weathering rates, which operated in a humid climate with a thermic regime (temperate-subtropical). These conditions align with previous qualitative interpretations based on macro- and micromorphological and mineralogical analyses of these paleosols, as well as palynological analyses of the Chorrillo Formation, which further demonstrate seasonality in rainfall. The climate data presented here are consistent with global paleoclimate reconstructions, where our study area (paleo-54° S) lies within the Maastrichtian paleo-Köppen climate zone “Temperate humid subtropical,” suggesting that during the Maastrichtian, subtropical conditions extended toward the poles by at least 22° of latitude in South America. This research provides new, relevant quantitative paleoclimatological data from the poorly constrained mid–high paleolatitudes of the Southern Hemisphere, refining current latest-Cretaceous climate reconstructions.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"174 ","pages":"Article 106144"},"PeriodicalIF":1.9,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873633","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":"Microfacies and biostratigraphy based on calpionellids and calcareous dinoflagellate cysts across the Jurassic/Cretaceous boundary, western Neuquén Basin, Baños Morales and Lo Valdés formations, Río Volcán section, Central Chile","authors":"Diego A. Kietzmann ,&nbsp;Alfonso Encinas","doi":"10.1016/j.cretres.2025.106136","DOIUrl":"10.1016/j.cretres.2025.106136","url":null,"abstract":"<div><div>This study presents the first biostratigraphic analysis of calpionellids and calcareous dinoflagellate cysts in the Tithonian–Hauterivian Baños Morales and Lo Valdés Formations, which crop out in the Principal Cordillera of central Chile (34°S). Additionally, it provides a preliminary interpretation of the sedimentary environment based on microfacies analysis. The Baños Morales and Lo Valdés Formations form an ∼800 m thick succession of basinal marlstone, sandstone and limestone, shallow-water limestones and thick intercalations of lavas, which developed on the western margin of the Neuquén Basin. The Baños Morales and Lo Valdés Formations are characterized by an abundant fossil content, a remarkable stratigraphic continuity along several hundred meters, and include the Jurassic/Cretaceous boundary. The detailed study of its type section (Baños Morales town, Volcán river), allowed the identification of a moderately to poorly preserved association of seventeen calpionellid species and fifteen calcareous dinoflagellate cyst species and four subspecies. Six calpionellid biozones (<em>Chitinoidella</em>, <em>Crassicollaria</em>, <em>Calpionella</em>, <em>Calpionellopsis</em>, <em>Calpionellites</em> and <em>Tintinnopsella</em>) and eight calcareous dinoflagellate cyst biozones (<em>Committosphaera pulla</em>, <em>Crustocadosina semiradiata</em>, <em>Colomisphaera tenuis</em>, <em>Colomisphaera fortis</em>, <em>Stomiosphaerina proxima</em>, <em>Stomiosphaera wanneri</em>, <em>Colomipshaera vogleri</em>, and <em>Colomisphaera conferta</em>), already known from the Tethyan and Andean regions, have been identified, enabling a more precise stratigraphic calibration for the Baños Morales and Lo Valdés Formations, as well as their stratigraphic correlation with the stratigraphic units of Argentina and international time scales.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106136"},"PeriodicalIF":1.9,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833200","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 rebbachisaurid (Dinosauria, Sauropoda) from the Huincul Formation (upper Cenomanian-Turonian) of Villa El Chocón (Neuquén Province, Argentina)","authors":"María Edith Simón ,&nbsp;Leonardo Salgado","doi":"10.1016/j.cretres.2025.106137","DOIUrl":"10.1016/j.cretres.2025.106137","url":null,"abstract":"<div><div><em>Cienciargentina sanchezi</em> gen. et sp. nov. is a new rebbachisaurid sauropod dinosaur from the Late Cretaceous of Argentina. The new species is erected on the basis of a unique combination of characters that includes many autapomorphies, among them: cervical epipophyses absent, anterior dorsal centra amphicoelous to slightly opisthocoelous, posterior dorsal centrum slightly opisthocoelous, posterior dorsal neural spines anteroposteriorly extended, mid and posterior dorsal vertebrae with intrapostzygapophyseal lamina supporting the postzygapophyses from below, middle and posterior dorsal vertebrae with accesory spinodiapophyseal lamina, lateral laminae in anterior caudal vertebrae formed by the spinoprezygapophyseal lamina and the spinopostzygapophyseal lamina, which fuse at the middle of the neural spine, anterior caudal vertebrae with spinoprezygapophyseal lamina more robust than spinopostzygapophyseal lamina, anterior caudal transverse processes with a full suite of diapophyseal laminae (anterior centrodiapophyseal lamina, posterior centrodiapophyseal lamina, prezygodiapophyseal lamina, postzygodiapophyseal lamina), ratio of length to height of the posterior caudal vertebrae 5 or higher, forked chevrons without anterior and posterior projections, and femoral head dorsally directed, rising well above the level of the greater trochanter. This new species is added to the list of rebbachisaurid sauropods documented in the Huincul Formation (upper Cenomanian-Turonian), which are thought to be the latest diplodocoids at global level. In fact: from the Turonian onwards, sauropod communities are composed exclusively of macronarians, mostly titanosaurs. In Patagonia, particularly in the Huincul Formation, the hypothetical faunal turnover that occurred in the middle of the Cretaceous, which involved not only sauropods but other groups of dinosaurs, is observed, perhaps like nowhere else in South America.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106137"},"PeriodicalIF":1.9,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842838","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}