IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.006

Marie-Béatrice Forel , Sylvain Charbonnier , Luka Gale , Nicolas Tribovillard , Pablo Martinez-Soares , Cristianini Trescastro Bergue , Felix M. Gradstein , Christian Gaillard

{"title":"A new chemosynthetic community (ostracods, foraminifers, echinoderms) from Late Jurassic hydrocarbon seeps, south-eastern France Basin","authors":"Marie-Béatrice Forel , Sylvain Charbonnier , Luka Gale , Nicolas Tribovillard , Pablo Martinez-Soares , Cristianini Trescastro Bergue , Felix M. Gradstein , Christian Gaillard","doi":"10.1016/j.geobios.2023.12.006","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.006","url":null,"abstract":"<div>Hydrocarbon seeps represent some of the most extreme marine habitats but are also home to rich communities developed around chemosynthesis rather than photosynthesis. Here we describe the outcrop of Sahune (Drôme department, south-eastern France), that illustrates a new seeping site during the Late Jurassic (middle Oxfordian), as formally demonstrated by geochemical proxies. We report the associated fauna composed of foraminifers, radiolarians, crinoids, echinoids and ostracods that all point to seepage at bathyal depth. The foraminifer assemblage and the occurrence of the irregular echinoid Tithonia oxfordiana together point to a middle Oxfordian age. We provide an in-depth analysis of the ostracod community, which is the oldest so far reported in such environments. The new species Procytherura praecoquum may be cognate to the seepage site and could illustrate the oldest known example of pore clusters, sometimes proposed as representing ectosymbiosis. The Sahune assemblage demonstrates that cold seep ostracod communities were already a mixture of taxa from platform and deep-sea oligotrophic environments. The post-Jurassic diversification of ostracods at cold seeps was related to colonization events and diversification of families that have been inhabitants of such ecosystems at least since the Oxfordian. The Sahune record changes our current conception of the deep-sea colonization by the ostracods Tethysia and Procytherura that occurred earlier than traditionally considered.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 1-24"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiproxy palaeoenvironmental reconstruction of the Bathonian Castelbouc sauropod tracksite (Causses Basin, southern France): Insight into a Middle Jurassic insular ecosystem 巴斯顿卡斯特布克长脚类动物足迹遗址（法国南部考斯盆地）的多代理古环境重建：洞察中侏罗世海岛生态系统

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.007

Jean-David Moreau , Vincent Trincal , Benjamin Bourel , Marc Philippe , Romain Vullo , Alain Jacquet , Christophe Durlet , Marie-Béatrice Forel , Didier Néraudeau , Sylvain Charbonnier , Dahvya Belkacem

{"title":"Multiproxy palaeoenvironmental reconstruction of the Bathonian Castelbouc sauropod tracksite (Causses Basin, southern France): Insight into a Middle Jurassic insular ecosystem","authors":"Jean-David Moreau , Vincent Trincal , Benjamin Bourel , Marc Philippe , Romain Vullo , Alain Jacquet , Christophe Durlet , Marie-Béatrice Forel , Didier Néraudeau , Sylvain Charbonnier , Dahvya Belkacem","doi":"10.1016/j.geobios.2023.12.007","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.007","url":null,"abstract":"<div>We report lignitic fossil rich-beds from the Bathonian Castelbouc sauropod tracksite (Castelbouc Cave N°4, Causses Basin, southern France). Showing the co-occurrence of amber with plant, vertebrate and invertebrate remains, they are a precious tool to reconstruct Middle Jurassic dinosaur ecosystems. A multiproxy approach combining sedimentology, petrology, mineralogy and palaeontology led to determine that these fossil rich-beds were deposited in a range of insular coastal palaeoenvironments. They include protected backshore areas such as freshwater/brackish ponds and brackish bay/lagoon showing co-occurrence of terrestrial and marine inputs. The backshore environments were particularly rich in ostracods (Darwinula sp., Fabanella bathonica) and gyrogonites of charophytes (Porochara douzensis). The abundance of conifer remains including leafy axes (Brachyphyllum), cones (cf. Classostrobus), wood (Brachyoxylon) and pollen grains (Classopollis) shows that ponds and bay/lagoon were bordered by conifer-dominated forests in which Cheirolepidiaceae were the main component. Such a rich and relatively diverse flora was probably an attractive source of food for megaherbivorous dinosaurs. Vertebrate microremains mostly consist of fish scales (Ginglymodi indet.) and crocodylomorph teeth (Atoposauridae indet.), two groups that are common components of Middle Jurassic paralic faunas. The palaeobotanical assemblage suggests a warm subtropical climate probably tropophilous with marked alternation between a wet and a dry season.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 65-82"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Late Triassic floras from Guangdong, South China: Biostratigraphical context and palaeoenvironmental implications 华南广东晚三叠世植物群：生物地层背景与古环境意义

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.003

Xiaoqing Zhang , Yongdong Wang , Chong Dong , Xiaoming Lin , Jianhua Jin

{"title":"Late Triassic floras from Guangdong, South China: Biostratigraphical context and palaeoenvironmental implications","authors":"Xiaoqing Zhang , Yongdong Wang , Chong Dong , Xiaoming Lin , Jianhua Jin","doi":"10.1016/j.geobios.2023.12.003","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.003","url":null,"abstract":"<div>Triassic-Jurassic deposits are well developed in Guangdong Province, South China. In particular, the Upper Triassic coal-bearing strata which alternate between marine and terrestrial deposits yield diverse and abundant fossil plants, ammonites and bivalves. These strata provide a significant reference for the study of palaeoenvironmental variations in the lower latitude regions. In this paper, we review the major progress on Late Triassic floral studies in this area. Specifically, we compare the regional plant assemblages from different fossil sites in central and northern Guangdong which have been dated with marine fauna. 155 species belonging to 56 genera of fossil plants have been reported so far in northern and central Guangdong. The Late Triassic floras in Guangdong are mainly composed of Bennettitales and ferns, followed by horsetails, seed ferns, cycads, ginkgos and conifers. In ascending order, four regional plant fossil assemblages can be recognized in the Late Triassic deposits, namely the Pachypteris-Lindleycladus Assemblage (Julian), the Pterophyllum-Baiera Assemblage (late Julian), the Clathropteris-Otozamites Assemblage (Tuvalian), and the Danaeopsis-Anomozamites Assemblage (Rhaetian). In general, the Late Triassic climate in the Guangdong region was mainly humid and warm and either tropical or subtropical. The fossil plants corroborate palaeomagnetic evidence that the central and northern Guangdong region was located at approximately the same latitude as it is today and formed the southern coastline of the South China Block during the Late Triassic. Palaeogeographically, the transgression started at the end of the Julian and the south coastal terrane consisted of a western bay, a peninsula and an eastern bay. During the regression period, post-Rhaetian, the bays evolved into a gulf coastal plain.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 115-129"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chancelloriids from the Cambrian (Stage 4) Balang Lagerstätte of South China and a reappraisal of their diversification in South China 华南寒武纪（第四期）巴朗古城出土的蝶形目动物及其在华南的多样性再评价

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.001

Hui Zhang , Qiu-Jun Wang , Cheng-Wan Zhang , Die-Die Luo , Xiu-Chun Luo , Yi-Fan Wang , De-Zhi Wang , Xing-Lian Yang

{"title":"Chancelloriids from the Cambrian (Stage 4) Balang Lagerstätte of South China and a reappraisal of their diversification in South China","authors":"Hui Zhang , Qiu-Jun Wang , Cheng-Wan Zhang , Die-Die Luo , Xiu-Chun Luo , Yi-Fan Wang , De-Zhi Wang , Xing-Lian Yang","doi":"10.1016/j.geobios.2023.12.001","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.001","url":null,"abstract":"<div>Chancelloriids are an enigmatic group of Cambrian animals characterized by radially symmetrical bodies equipped with spiny sclerites. Although they were major components of many benthic communities, current understanding on how this group diversified during the Cambrian remains limited. Clarifying these confusions about the diversification of chancelloriids requires new information provided by new studies of previously described and/or new material. Considering the emerging scenario of chancelloriids, the sack-like chancelloriids from the Stage 4 Balang Lagerstätte are restudied on the basis of previous collections, which are herein separated from Chancelloria eros Walcott, 1920, and revised as Archiasterella acuminata nov. sp. and Chancelloriidae gen. et sp. indet. The Ar. acuminata specimen is well preserved and does show its scleritome and sclerite characters, while the Chancelloriidae gen. et sp. indet. specimen is poorly preserved and its scleritome and sclerite characters are difficult to distinguish. By combining information from previous studies and the present research, data on chancelloriid occurrences in South China indicate that chancelloriids had once diversified in the Cambrian South China, evidenced by high-level richness of sclerite-based taxa during the late Fortunian to the middle Stage 3, and of sclerite formulas during the late Stage 2 to the Wuliuan. The result is inconsistent with the recent viewpoint that there were two flourishing ages of chancelloriids in South China. Although more evidence is needed to support our results, the present study offers insights in understanding the evolutionary dynamics of chancelloriids.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 103-114"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review of Palaeogiraffa (Giraffidae, Mammalia) from the Vallesian of the Eastern Mediterranean 东地中海瓦利西亚的 Palaeogiraffa（长颈鹿科，哺乳动物）综述

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.002

Kostantis Laskos, Dimitris S. Kostopoulos

{"title":"A review of Palaeogiraffa (Giraffidae, Mammalia) from the Vallesian of the Eastern Mediterranean","authors":"Kostantis Laskos, Dimitris S. Kostopoulos","doi":"10.1016/j.geobios.2023.12.002","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.002","url":null,"abstract":"<div>Palaeogiraffa is a poorly understood giraffid genus from the Vallesian of Axios Valley (Northern Greece), Turkish Thrace and Central Turkey. The Axios Valley remains come from three non-contemporaneous Vallesian faunas from the localities: Pentalophos, Ravin de la Pluie, and Xirochori, whereas the Turkish remains come from the Vallesian faunas of Middle Sinap, Yulafli, and Küçükçekmece. Remains from Pentalophos and Ravin de la Pluie were described as congeneric with the Iberian Deccenatherium, although they were later attributed to a new, distinct genus known by three different species: Palaeogiraffa macedoniae, Palaeogiraffa pamiri, and Palaeogiraffa major. The type species of the genus, Pg. macedoniae, was based on the most abundant Pentalophos material, while the rest of the species was established mainly on size difference criteria. Here we provide a review of the Palaeogiraffa material in order to (i) test its validity, (ii) re-discuss hypotheses about the genus phylogenetic relationships with other Late Miocene giraffids, and (iii) re-explore intrageneric diversity and number of recognized species based on the available Eastern Mediterranean samples. We confirm Palaeogiraffa as a distinct genus from other Late Miocene giraffids based on its unique proportions, as well as its dental and postcranial morphology. Furthermore, we endorse the likelihood of Palaeogiraffa being phylogenetically linked to the sivatherine lineage, based mainly on its dental and metatarsal morphological features. The generic attribution of specimens from Xirochori, Ravin de la Pluie, Middle Sinap, Yulafli and Küçükçekmece to Palaeogiraffa is adequately supported by the present data. Nevertheless, the recognition of three species is more open to discussion, though they should be retained until more material is available.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 25-43"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First record of Chelonian coprolites from the Early-Middle Miocene Kutch Basin, western India, and their palaeodietary and palaeobiological implications 印度西部中新世早中期卡奇盆地首次发现的螯足类共生石及其古饮食和古生物学意义

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.004

Ramanand Sagar , Vivesh V. Kapur , Kamlesh Kumar , P. Morthekai , Anupam Sharma , Sunil K. Shukla , Amit K. Ghosh , Gaurav Chauhan , M.G. Thakkar

{"title":"First record of Chelonian coprolites from the Early-Middle Miocene Kutch Basin, western India, and their palaeodietary and palaeobiological implications","authors":"Ramanand Sagar , Vivesh V. Kapur , Kamlesh Kumar , P. Morthekai , Anupam Sharma , Sunil K. Shukla , Amit K. Ghosh , Gaurav Chauhan , M.G. Thakkar","doi":"10.1016/j.geobios.2023.12.004","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.004","url":null,"abstract":"<div>In this paper, we provide the first data on large (cm-sized) coprolites (represented by three morphotypes) comprising a rare occurrence of eight specimens from a total of three vertebrate-bearing horizons identified within the Early Miocene (Aquitanian) Khari Nadi Formation and Middle Miocene (Burdigalian-Langhian) Chassra Formation, Kutch Basin, western India. The geochemical data confirm the phosphatic character of the investigated ichnofossils. The dominance of partly digested bone matter and presence of plant remains in all the three coprolite morphotypes reflects the omnivorous diet of the producers, which were most likely chelonians. The occurrence of an inclusion (in a coprolite specimen recorded in this study) showcasing an ultrastructure similar to mammalian dental enamel is a rarity in Neogene coprolite records. Additional biotic inclusions observed in the investigated coprolites include ostracods (assigned to genera Paractinocythereis, Hermanites, and Propontocypris); large planispiral benthic foraminifera including the genus Quinqueloculina; uniserial and biserial benthic foraminifera belonging to genus Textularia; marine calcareous algae genus Actinoporella; chrysophytes (resting spores or cysts of planktonic algae); sponge spicules (represented by the morphotypes Acanthoxea and Strongyle); freshwater diatom genus Aulacoseira; unidentified fungal remains; and phytoliths. Taken together, the biotic and abiotic (e.g., pyrite) inclusions, geochemical data and associated microbiota suggest that these ichnofossils were deposited in a dominantly coastal marine (intertidal) setting linked to a lacustrine/palustrine environment.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 83-101"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The rodent fauna from Prat de Cest (Aude, France) and its biochronological implications for the Early Miocene Prat de Cest（法国奥德省）的啮齿动物群及其对早中新世的生物年代学影响

IF 1.6 4区地球科学

Geobios Pub Date : 2024-06-01 DOI: 10.1016/j.geobios.2023.12.005

Vincent Luccisano , Xavier Valentin , Géraldine Garcia , Vincent Lazzari

{"title":"The rodent fauna from Prat de Cest (Aude, France) and its biochronological implications for the Early Miocene","authors":"Vincent Luccisano , Xavier Valentin , Géraldine Garcia , Vincent Lazzari","doi":"10.1016/j.geobios.2023.12.005","DOIUrl":"https://doi.org/10.1016/j.geobios.2023.12.005","url":null,"abstract":"<div>The new Prat de Cest locality (Narbonne-Sigean Basin, Aude, France) provides a rodent fauna composed of Pseudocricetodon thaleri, Simplomys aff. aljaphi, Vasseuromys cf. bergasensis, Plesiosminthus myarion and Rhodanomys occitanensis nov. sp. Eomyidae account for more than 78% of the material collected and reflect a humid and forested environment. The presence of Plesiosminthus myarion and Simplomys aff. aljaphi, the evolutionary stage of Pseudocricetodon thaleri, close to the population of Coderet (MP30) but displaying some derived characters shared by Early Miocene populations, and the intermediate morphology and size of R. occitanensis nov. sp. between Rhodanomys transiens and Rhodanomys schlosseri support a basal MN1 age for Prat de Cest. The glirid Vasseuromys cf. bergasensis is the first occurrence of this genus outside Spain and could also be the first occurrence of Vasseuromys bergasensis in the Early Miocene. The unique faunal association found in Prat de Cest paves the way for a possible subdivision of the MN1 biozone.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"84 ","pages":"Pages 45-63"},"PeriodicalIF":1.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141298317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Not too fast: Maximum running speed estimation of the Miocene rheid Opisthodactylus kirchneri (Aves, Rheidae) 不要太快:中新世黑齿蛇(蛇目，黑齿蛇科)的最大奔跑速度估计

IF 1.6 4区地球科学

Geobios Pub Date : 2024-04-01 DOI: 10.1016/j.geobios.2023.03.006

Washington W. Jones , Raúl I. Vezzosi , Blanco R. Ernesto

引用次数: 0

New avian remains from the early Eocene of La Borie, southern France 法国南部La Borie始新世早期的新鸟类遗骸

IF 1.6 4区地球科学

Geobios Pub Date : 2024-04-01 DOI: 10.1016/j.geobios.2022.10.004

Cécile Mourer-Chauviré , Estelle Bourdon , Sylvain Duffaud , Guy Le Roux , Yves Laurent

{"title":"New avian remains from the early Eocene of La Borie, southern France","authors":"Cécile Mourer-Chauviré , Estelle Bourdon , Sylvain Duffaud , Guy Le Roux , Yves Laurent","doi":"10.1016/j.geobios.2022.10.004","DOIUrl":"10.1016/j.geobios.2022.10.004","url":null,"abstract":"<div>The giant flightless bird Gastornis laurenti Mourer-Chauviré and Bourdon, 2020, has been described from a mandible, maxilla and quadrate discovered in the early Eocene locality of La Borie (middle Ypresian, reference level MP 8–9). This locality has yielded abundant fossil vertebrates. We describe here new postcranial remains of G. laurenti, a coracoideum assigned to Tegulavis corbalani nov. gen., nov. sp. (cf. Galliformes), a tarsometatarsus attributed to Papulavis annae nov. gen., nov. sp. (cf. Aramidae), and the tibiotarsus of a small gruiform related to either Walbeckornis or Messelornithidae. The study of the postcranial material confirms that the species G. laurenti differs from other species of Gastornis in many features. The avifauna from La Borie is not very diversified but matches well with the paleoenvironment, which consists of an alluvial flood plain with sparse vegetation, in a tropical climate.LSID of publication: urn: lsid: zoobank.org: pub: 5BA44166-BBEZ-41E7-BG8C-8A1DBCBA14AB.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"83 ","pages":"Pages 61-84"},"PeriodicalIF":1.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47356118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Jaw anatomy of Vegavis iaai (Clarke et al., 2005) from the Late Cretaceous Antarctica, and its phylogenetic implications 晚白垩纪南极洲Vegavis iaai的颌骨解剖（Clarke et al.，2005）及其系统发育意义

IF 1.6 4区地球科学

Geobios Pub Date : 2024-04-01 DOI: 10.1016/j.geobios.2023.03.004

Gerardo P. Álvarez-Herrera , Sebastián Rozadilla , Federico L. Agnolín , Fernando E. Novas

{"title":"Jaw anatomy of Vegavis iaai (Clarke et al., 2005) from the Late Cretaceous Antarctica, and its phylogenetic implications","authors":"Gerardo P. Álvarez-Herrera , Sebastián Rozadilla , Federico L. Agnolín , Fernando E. Novas","doi":"10.1016/j.geobios.2023.03.004","DOIUrl":"10.1016/j.geobios.2023.03.004","url":null,"abstract":"<div>Vegavis iaai is without any doubt the most complete and well-known Mesozoic bird from Antarctica. In spite of being known by several specimens, its highly specialized postcranial anatomy has obscured the recognition of its phylogenetic affinities. Skull material from Vegavis is scarce, and the lower jaw is known by a relatively well-preserved articular region of a partially articulated specimen (MACN-PV 19.748). The aim of the present contribution is to describe this articular region and to analyze its potential phylogenetic information. The articular region of Vegavis shows a unique combination of characters that separates it from most Mesozoic lineages. On the contrary, its anatomy is congruent with that of neornithine birds, and particularly from the neoavian clade Aequorlitornithes. Detailed comparisons led to the recognition of several shared features, including a well-developed transverse crest posterior to the articular cotyles, that bears a well-developed lateral tubercle; a short and ventrally deflected retroarticular process; a dorsally exposed posterior fossa; tree cotyles for jaw articulation, with a well-developed caudal cotyle fused to the medial cotyle; and lateral crest anteriorly projected with respect to the lateral cotyle. The three-cotyle articulation of the jaw of Vegavis invited us to review skull anatomy of its close kin Polarornis. A review of the bones of Polarornis indicates that the element previously identified as a quadrate is an uncertain bone, and thus, skull-jaw articulation of this taxon remains unknown. In contrast with previous contributions, we were not able to find diagnostic features of the Galloanserae clade on Vegavis jaw. The neoavian-like jaw of Vegavis contrasts with the anseriform signature of its postcranium, suggesting that this bird held some kind of morphological mosaicism on its skeleton.</div>","PeriodicalId":55116,"journal":{"name":"Geobios","volume":"83 ","pages":"Pages 11-20"},"PeriodicalIF":1.6,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47743886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geobios最新文献