Cretaceous Research最新文献

{"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":"Paleoenvironmental changes in the western Tethys carbonate platforms during OAE-2: Implications from phosphorus, δ18O, δ13C and facies analysis","authors":"Sahara Cardelli ,&nbsp;Barbora Křížová ,&nbsp;Michele Morsilli ,&nbsp;Renato Posenato ,&nbsp;Thierry Adatte ,&nbsp;Brahimsamba Bomou ,&nbsp;Jorge E. Spangenberg ,&nbsp;Lorenzo Consorti ,&nbsp;Amerigo Corradetti ,&nbsp;Marco Franceschi ,&nbsp;Valentina Brombin ,&nbsp;Gianluca Frijia","doi":"10.1016/j.cretres.2025.106133","DOIUrl":"10.1016/j.cretres.2025.106133","url":null,"abstract":"<div><div>Oceanic anoxic event 2 (OAE-2) is one of the largest paleoclimatic events of the whole Phanerozoic which occurred at the Cenomanian/Turonian Boundary (CTB). It caused major perturbation of the C-cycle at global scale together with changes in other geochemical cycles. OAE-2 severely impacted marine and terrestrial settings causing faunal turnovers both in pelagic and neritic environments. The exact mechanisms triggering OAE-2 are debated but it is believed that the main driver was a massive injections of volcanic CO₂ in the atmosphere. The effect of OAE-2 on deep-water communities has been extensively documented in literature. In contrast, less data are available for their shallow-waters counterparts. Geochemical and semiquantitative facies analysis on samples from two carbonate platforms located in Italy (former western Tethys) are presented in this paper, where new data from the Friuli-Adriatic Carbonate Platform are compared with a well-known section from the Apennine Carbonate Platform. Our data show a good correlation between these platforms, located 1000 km apart. Phosphorus concentrations are low except for two intervals: (1) at the onset of the OAE-2 and (2) in the late phase of the event. The δ¹⁸O record shows an increase of the Sea Surface Temperature (SST) during the event interrupted by a cooler interval. Our data indicate a correlation between geochemical changes and faunal turnover of benthic foraminifera and rudists, suggesting the co-occurrences of several causes for the demise of these groups during OAE-2.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106133"},"PeriodicalIF":1.9,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808372","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 gnathosaurine (Pterosauria, Pterodactyloidea) from the Early Cretaceous of eastern Thailand","authors":"Sita Manitkoon ,&nbsp;Rodrigo V. Pêgas ,&nbsp;Thanit Nonsrirach ,&nbsp;Prapasiri Warapeang ,&nbsp;Komsorn Lauprasert ,&nbsp;Uthumporn Deesri ,&nbsp;Sakboworn Tumpeesuwan ,&nbsp;Kamonlak Wongko ,&nbsp;Xuanyu Zhou","doi":"10.1016/j.cretres.2025.106135","DOIUrl":"10.1016/j.cretres.2025.106135","url":null,"abstract":"<div><div>Pterosaur fossils in the Mesozoic formation of Southeast Asia are very scarce. A few articles reported isolated teeth and a handful of postcranial elements in northeastern Thailand. Here we report on a pterosaur upper jaw from the Early Cretaceous at Phra Prong locality of eastern Thailand, which is considered the lateral equivalent of the Sao Khua Formation of the Khorat Group. This represents the first pterosaur cranial material in Thailand. It comprises a partial rostrum, preserving eleven tooth positions, and four associated tooth crowns. The anterior tip of the rostrum is dorsoventrally flattened and laterally expanded (spoon-shaped), indicating affinities to the Gnathosaurinae (Ctenochasmatidae). Alveoli borders are conspicuously scalloped and collar-like, and the palatal surface exhibits a pair of sinusoidal grooves. These features bear a strong resemblance to the Late Jurassic gnathosaurines <em>Gnathosaurus subulatus</em>, <em>Tacuadactylus luciae</em>, and <em>Lusognathus almadrava</em>. Our phylogenetic analysis indicates that the Thai pterosaur is closely related to these gnathosaurines. Still, the Thai gnathosaurine is unique in exhibiting a kite-shaped rostrum expansion and is recognized as a new taxon herein named <em>Garudapterus buffetauti</em> gen. et sp. nov. This new specimen provides essential information regarding pterosaurs, including updated data for a better understanding of their diversity and distribution throughout Southeast Asia.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106135"},"PeriodicalIF":1.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799505","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 giant spinosaurid from the Iberian Peninsula and new data on the Early Cretaceous Iberian non-avian theropod palaeodiversity","authors":"Erik Isasmendi ,&nbsp;Elena Cuesta ,&nbsp;Adrián Páramo ,&nbsp;Xabier Pereda-Suberbiola","doi":"10.1016/j.cretres.2025.106134","DOIUrl":"10.1016/j.cretres.2025.106134","url":null,"abstract":"<div><div>Despite some exceptional cases, the Lower Cretaceous theropod record from Iberia mainly comprises isolated teeth and fragmentary skeletons. In the Cameros Basin, theropods have been mostly documented in the Eastern Cameros sub-basin with baryonychine spinosaurids dominating this sector. Instead, theropods are rarer in the Western Cameros sub-basin. Here, we describe material from the Western Cameros sub-basin, recovered in the upper Hauterivian–lower Barremian Golmayo Formation of Soria (Los Caños and Zorralbo I sites), which allowed us to identify three early-branching tetanuran and three baryonychine dental morphotypes, and a large-sized spinosaurid from Zorralbo I. The latter is represented by cranial, axial, and appendicular bones, and identified as a large-sized baryonychine based on anatomical and phylogenetic studies. Our results demonstrate that the theropod assemblages are consistent within the entire Cameros Basin, exhibiting a dominance of baryonychines. Western Cameros theropods are not only limited to Baryonychinae but they would also coexist with other early-branching tetanurans and coelurosaurians. The Lower Cretaceous Iberian record is represented by taxa from all major clades within Theropoda (i.e., Tetanurae, Allosauroidea, Carcharodontosauria, Coelurosauria, Ornithomimosauria, Paraves and Dromaeosauridae), being Spinosauridae the most prevalent group, with five described genera and species and a large number of tooth morphotypes. Indeed, three spinosaurine and ten baryonychine tooth morphotypes have been identified in the Iberian record so far. This study demonstrates that the entire Cameros Basin has a great representation of the theropod record of the Iberian Peninsula, and it underscores the potential of this basin to understand the Iberian palaeobiodiversity, especially in spinosaurids.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"173 ","pages":"Article 106134"},"PeriodicalIF":1.9,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808371","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 Coniacian sequence in the western Iberian Ranges (Spain): Stratigraphic architecture, systems tracts, biostratigraphy and high-frequency cyclicity","authors":"Javier Gil-Gil,&nbsp;José Francisco García-Hidalgo,&nbsp;Carme Boix","doi":"10.1016/j.cretres.2025.106121","DOIUrl":"10.1016/j.cretres.2025.106121","url":null,"abstract":"<div><div>The Coniacian 3rd-order sequence comprises nine 4th-order parasequences (PsCo1–PsCo9). PsCo1 and PsCo2 are considered a Shelf Margin Wedge as in a Lowstand Systems Tract (LST). Parasequences PsCo3 to the lower part of PsCo6 show an aggradational and retrogradational geometry with onlap on the basal boundary, representing the Transgressive Systems Tract (TST). The upper part of PsCo6 to PsCo9 represents the Highstand Systems Tract (HST) with a Highstand Normal Regression (HNR), upper part of PsCo6 and PsCo7. PsCo8 and PsCo9 show a significative retrogradation of the outer ramp facies and a Forced Regressive Systems Tract (FRST) with progradation of siliciclastic facies from emerged massif on the carbonate facies. The rapid northwards progradation during HST originates a change from a homoclinal ramp to a distally-steepened one. The Coniacian–basal Santonian age is based on the presence of <em>Forresteria</em> (<em>Harleites</em>) <em>petrocoriensis</em> (base of PsCo1) and of <em>Cladoceramus undulatoplicatus</em> (top of PsCo9). <em>Metatissotia ewaldi</em>, <em>Tissotioides hispanicus</em>, <em>Gauthiericeras margae</em> and <em>Prionocycloceras iberiense</em> zones characterize the middle Coniacian. Finally, the late Coniacian is characterised by the <em>Protexanites burgeoisi</em> and <em>Hemitissotia</em> spp. zones. The parasequences are considered to have originated from long eccentricity cycles (0.405 Myr) of Milankovitch's band. Correlation and the reconstruction of the depositional architecture allow quantifying the sedimentary processes and trends, systems tracts, and temporal amplitude of hiatuses. The sequence at the northern outcrops spans 3.65 Myr, and only 0.81 Myr at the southern ones, with most time contained in the hiatuses of the basal (2.43 Myr) and upper (0.405 Myr) sequence boundaries.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"172 ","pages":"Article 106121"},"PeriodicalIF":1.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759291","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":"An Upper Cretaceous mesophotic coral reef (Gosau Group, Eastern Alps, Austria): Significance for the palaeoreef record","authors":"Diethard Sanders ,&nbsp;Rosemarie Baron-Szabo ,&nbsp;Holger Gebhardt ,&nbsp;Felix Schlagintweit ,&nbsp;Michael Wagreich","doi":"10.1016/j.cretres.2025.106123","DOIUrl":"10.1016/j.cretres.2025.106123","url":null,"abstract":"<div><div>Cretaceous reefs that record coral growth under mesophotic conditions apparently are very rare. Hereunder we present a middle-upper Coniacian to lower Santonian reef composed mainly of coral platestone that is located within the synorogenic wedge-top succession of the Eastern Alps (Gosau Group, Turonian to Ypresian) near Strobl am Wolfgangsee (Salzburg, Austria).</div><div>In the studied reef, an exposed 15–18 m of coral platestone is overlain by a few meters of domestone-mixstone and bioclastic limestones. The platestones display a dense, continuous, interlocked fabric with a matrix of wackestone with planktic foraminifera and calcareous nannoplankton. Bioencrustation of coralla and boring traces are scarce. Hippuritids and radiolitids settled on the corals, but only few developed into adults. The dome/mixstones comprise massive and branched corals, show a packed fabric, and contain intercalated singles and clusters of rudists. In the reefal interval, one helioporid octocoral and 25 colonial scleractinian species (25 % pennular species) were identified. The top bioclastic limestones contain dasycladaleans, Miliolina, Textulariina and rare Rotaliina.</div><div>The vertical succession from coral platestones to bioclastic limestones indicates shoaling. The platy-foliaceous shapes and packing of coralla in the platestones, and the scarce encrustation suggest constratal to low-superstratal growth under mesophotic conditions. In the dome/mixstones, toppled corals and rudists indicate episodic disturbance. In Jurassic seas mesophotic reefs were widespread, yet the studied reef is the first Upper Cretaceous example. This contrast in reef style may be attributable to: (1) intensified production and dispersal of chalk; (2) extinction/emigration of Jurassic microsolenids; and, (3) implicit description of Cretaceous mesophotic reefs.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"172 ","pages":"Article 106123"},"PeriodicalIF":1.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768364","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":"Palaeoenvironmental and palaeoecological inferences from inclusions in vertebrate omnivore coprolites from the Upper Cretaceous Lameta Formation of central India","authors":"Ashu Khosla ,&nbsp;Karen Chin ,&nbsp;Omkar Verma ,&nbsp;Spencer G. Lucas ,&nbsp;Adrian P. Hunt ,&nbsp;Dangpeng Xi ,&nbsp;Debi Dutta ,&nbsp;Habib Alimohammadian","doi":"10.1016/j.cretres.2025.106110","DOIUrl":"10.1016/j.cretres.2025.106110","url":null,"abstract":"<div><div>Fossil faeces, or coprolites, offer unique insights into prehistoric food webs and ecosystems as well as direct evidence of the diet of faecal producers. We collected hundreds of coprolites from the Upper Cretaceous Pisdura site of Central India. Type A morphotype coprolites from the Lameta Formation of Pisdura, Maharashtra, India, have been found to have a rich microbiota with unique plant fossils. When macerated fractions were analysed using scanning electron microscopy, seven ostracod taxa were found, together with diatoms (<em>Aulacoseira</em> sp.), a charophyte (<em>Microchara</em> sp.), and sponge spicules. Thin sections of one of the coprolites also revealed a large number of likely chrysophytes. One of the cut slab specimens of the coprolite contains an insect body part with a partially intact wing. In addition, a review of previous studies reveals that spores, fungal remnants, thecamoebians, testate amoebae, and plant remains are also present in the Type A coprolites. For the Lameta Formation in Pisdura, the microbiota provide evidence for a Maastrichtian age and fluvio-lacustrine depositional conditions and other varied environments. Much of the plant detritus is not identifiable, but some tissues can be recognised, such as Poaceae cuticle, spores, wood, cones, seeds, phytoliths, and silica-replaced leaf laminae. Chemical analyses show that the coprolites have a phosphorus content of between 12.2 and 16.2 weight% which suggests a carnivorous habit. Thus, these Type A coprolites reveal that the ancient faecal producers not only consumed aquatic microbiota and abundant plant tissues but also likely ingested soft animal tissues as well. Although water input may have been the source of testate amoebae, diatoms, sponge spicules, and algae remnants, the peculiar pairing of a phosphatic composition with dietary residues from plants and microbiota suggests that the ancient faecal producers were omnivores. This feeding habit implied by the Type A coprolites indicates that previous attributions to herbivorous titanosaurs are not well-supported.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"172 ","pages":"Article 106110"},"PeriodicalIF":1.9,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725168","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 species of Lechytia Balzan, 1892 (Arachnida: Pseudoscorpiones) from Burmese amber highlights 99 million years of morphological stasis","authors":"Maya Hagen ,&nbsp;Ulrich Kotthoff ,&nbsp;Danilo Harms ,&nbsp;Stephanie F. Loria","doi":"10.1016/j.cretres.2025.106120","DOIUrl":"10.1016/j.cretres.2025.106120","url":null,"abstract":"<div><div>The pseudoscorpion genus <em>Lechytia</em> Balzan, 1892 (Chthoniidae Daday, 1889: Lechytiinae Chamberlin, 1929) includes 27 extant species that are distributed across all continents except Antarctica, and a single extinct species from Dominican amber of Miocene age. We document the first record of <em>Lechytia</em> from Burmese amber (Cenomanian: ∼99 Ma), <em>Lechytia finniae</em> sp. nov., making it the oldest fossil record for <em>Lechytia</em> and extending the known temporal range of this group by more than 70 million years into the Mesozoic. The new species differs from most extant <em>Lechytia</em> species due to the distance between trichobothria <em>sb</em> and <em>b</em> that are separated by at least one areolar diameter, and by the absence of eyes. Since there is a close morphological resemblance between <em>L. finniae</em> sp. nov. and extant <em>Lechytia</em> species, the new fossil is placed in an extant genus and represents yet another example of morphological stasis in pseudoscorpions. The presence of <em>Lechytia</em> in Burmese amber implies that this genus was present on the Burma Terrane in the Cretaceous although no extant species are known from this landmass today. The ecology of extant species may lend support to a tropical forest environment on the Burma Terrane.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"172 ","pages":"Article 106120"},"PeriodicalIF":1.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759292","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 conditions and palaeoenvironment during the Early Cretaceous: Evidence from macerals and organic carbon isotopes of the coal from Hailar Basin, Northeast China","authors":"Rongkun Jia ,&nbsp;Jingjing Liu ,&nbsp;James C. Hower ,&nbsp;Yaofa Jiang ,&nbsp;Shumao Zhao ,&nbsp;Qiuchan Han ,&nbsp;Niande Shang ,&nbsp;Jiawei Feng ,&nbsp;Kaiyan Teng","doi":"10.1016/j.cretres.2025.106118","DOIUrl":"10.1016/j.cretres.2025.106118","url":null,"abstract":"<div><div>The Cretaceous represented a Period of intense palaeoenvironmental change. Coal seams preserve continual records of palaeoenvironments, such as wildfire events that occur during peat accumulation. To understand wildfire events and terrestrial climate variations during the peat accumulation, maceral characteristics and organic carbon isotope compositions were examined in the Lower Cretaceous coals from Yimin and Baorixile mines, which are located in the south and north of Hailar Basin, Northeast China, respectively. The dominant macerals are inertinite and huminite and the former has an average content of 57.9 % and 51.3 % in the Yimin and Baorixile mines, respectively, indicating the coals are an inertinite-rich. The features and abundance of inertinite shows they are formed by high frequency-wildfire events. The palaeo-wildfire temperatures estimated by average inertinite reflectance of the Yimin and Baorixile coal mines are proximately 333 °C and 344 °C, respectively, indicating that the palaeo-wildfire were the type of ground fire. The difference in palaeo-wildfire temperatures between the Baorixile and Yimin coal mines indicates that different vegetation types were developed in the northern and southern regions. Wildfire, an important event of the Early Cretaceous peat-accumulating system in the Hailar Basin, might have influenced the evolution of vegetation and ecological cycle both in the land and water systems. The subtle variability of the organic carbon isotope in the coal seam profile implies a response to the palaeoclimate change of seasonally wet and dry.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106118"},"PeriodicalIF":1.9,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637504","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 occurrence of Distobatus Werner, 1989 (Elasmobranchii: Hybodontiformes) in the middle Cretaceous (Albian–Cenomanian) of Brazil: Taxonomic and biogeographical implications","authors":"Paulo M. Brito ,&nbsp;Ingrid M. Veiga ,&nbsp;Didier B. Dutheil ,&nbsp;Lilian P. Bergqvist","doi":"10.1016/j.cretres.2025.106119","DOIUrl":"10.1016/j.cretres.2025.106119","url":null,"abstract":"<div><div>Fossil teeth from the middle Cretaceous (Albian–Cenomanian) Açu Formation of the Potiguar Basin, Northeastern Brazil, previously described as <em>Tribodus</em> sp., are redescribed as a new species of the hybodontiform shark genus <em>Distobatus</em> Werner, 1989. The new taxon, <em>Distobatus potiguarense</em> sp. nov., is based on crown ornamentation, formed by delicate parallel ridges in the form of waves that follow each other, in occlusal view. The presence of <em>Distobatus</em> in the Açu Formation represents the westernmost distribution of this taxon and confirms the taxonomic and environmental similarity between the faunas found in North Africa and Northeastern Brazil. The new species confirms the existence of Distobatidae in South America immediately after the separation of the northern part of Gondwana.</div></div>","PeriodicalId":55207,"journal":{"name":"Cretaceous Research","volume":"171 ","pages":"Article 106119"},"PeriodicalIF":1.9,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610675","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}