Geodiversitas最新文献

{"title":"Oligocene larger benthic foraminifera and sedimentation of the Burdur Basin, SW Anatolia, Turkey","authors":"F. Gedik, L. Karadenizli","doi":"10.5252/geodiversitas2021v43a13","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a13","url":null,"abstract":"ABSTRACT This study focuses on the Oligocene successions that contain predominantly siliciclastic, limestones with larger benthic foraminifera in the Burdur Basin of southwest Anatolia, Turkey. The Burdur-1 and Burdur-2 sections in the Oligocene deposits are described sedimentologically and were sampled for lithology, biostratigraphy, microfacies analysis and fossil content. Larger benthic foraminifera were mainly recovered from limestones in the upper part of the Burdur-2 section. Thin-section analysis of the larger benthic foraminiferal assemblage reveals that the upper part of the Burdur-2 section includes Nummulites fichteli Michelotti, 1841, Operculina complanata (Defrance, 1822), Nephrolepidina praemarginata (Douvillé, 1908), Eulepidina sp., Planorbulina sp., Amphistegina sp., and Asterigerina sp. This foraminiferal association represents the Shallow Benthic Foraminifera Zone 22 (SBZ 22) of Rupelian-early Chattian age. Sedimentological analysis in the Burdur-1 and Burdur-2 sections has revealed an association of massive-unorganized conglomerate, parallel-bedded sandstone, massive mudstone, graded-massive conglomerate, graded-massive sandstone, well-sorted organized conglomerate, well-sorted parallel-bedded sandstone and microfossil-bearing parallel-bedded limestone facies. Alluvial fan /river, fan-delta, beach and shallow shelf carbonate facies communities were identified by lateral and vertical correlation of facies. It is concluded that the large Burdur Fan developed in a graben basin that opened and was flooded by a branch of the Tethyan Ocean that invaded southwest Anatolia during the Oligocene.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49027802","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 \"condylarths\" (archaic Ungulata, Mammalia) from the early Palaeocene of Tiupampa (Bolivia): implications on the origin of the South American ungulates [X27465] Matrix Muizon and Cifelli 2000","authors":"C. Muizon, R. Cifelli","doi":"10.7934/X27465","DOIUrl":"https://doi.org/10.7934/X27465","url":null,"abstract":"The oldest known condylarth fauna of the Tertiary of South America comes from basal Palaeocene strata of the Santa Lucia Formation at Tiupampa (Bolivia). It includes five genera and seven species: Molinodus suarezi, Tiuclaenus minutus, T. cotasi n. sp., T. robustus n. sp., Pucanodus gagnieri, Andinodus boliviensis, and Simoclaenus sylvaticus, n. gen., n. sp. This work presents a thorough revision of all the fossils previously described, which are interpreted in the light of recently discovered specimens including materials belonging to three new taxa. The sample contains 33 jaws and 43 isolated teeth. The Tiupampa condylarths are included in the Kollpaniinae Marshall, Case & Woodburne, 1990 (= Molinodinae Bonaparte, Van Valen & Kramartz, 1993), a subfamily of the Mioclaenidae (Kollpania tiupampina Marshall & Muizon, 1988, the type species of the type genus of the Kollpaniidae Marshall, Case & Woodburne, 1990 is regarded as a junior synonym of Tiuclaenus minutus Muizon & Marshall, 1987). Some of the taxa (e.g., Molinodus suarezi, Tiuclaenus cotasi) are well represented and the cheek dentition of the former is almost completely known. However, other genera such as Andinodus and Simoclaenus are still poorly known (a few lower teeth only in the case of Andinodus). Because of their scant representation, their position within the Kollpaniinae still has to be confirmed by the discovery of new specimens, especially upper molars of Andinodus. The Tiupampa condylarths are clearly related to the North American Mioclaenidae, although it is not possible to securely relate them to a specific genus. They share with the North American taxa the following derived characters when compared to Protungulatum: bulbous cusps, the apices of which are approximated in occlusal view; protocone enlarged; stylar shelf greatly reduced or lost; styles reduced and tending to be aligned with para- and metacristae; paraconid appressed against metaconid; entoconid and hypoconulid connate to fused, and forming an obliquely oriented posterolingual crest. The major characteristics of the Kollpaniinae are: metaconid well posterior to protoconid, strongly inflated, and invading the talonid basin posteriorly; loss of the entocristid; hypoconid extremely inflated, occupying at least the medial half of the talonid (generally more); talonid basin reduced to an obliquely oriented groove that is widely opened lingually; posterior slope of the hypoconulid of m3 less convex than in the other mioclaenids. The Kollpaniinae (Tiupampa condylarths and Escribania) are also regarded as closely related to the Didolodontidae and Litopterna (especially the Protolipternidae). The key synapomorphy of the three groups is the morphology and development of the paracristid, which is narrower than half the width of the trigonid, deeply arched posteriorly, projected anteriorly, and attaching on the anterior to anterolingual side of the proto- and paraconids. Study of the Tiupampa condylarths confirms that the So","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44896553","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 data on the Triassic temnospondyls from the Karoo rift basins of Tanzania and Zambia","authors":"J. Steyer, B. Peecook, Thomas Arbez, S. Nesbitt, S. Tolan, M. Stocker, Roger M. H. Smith, K. Angielczyk, C. Sidor","doi":"10.5252/geodiversitas2021v43a12","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a12","url":null,"abstract":"ABSTRACT Temnospondyl specimens collected recently in the Middle-?Late Triassic of the Ruhuhu (Tanzania) and Luangwa (Zambia) rift basins are described and figured. They are attributed to cf. Cherninia megarhina (Chernin & Cosgriff, 1975), Mastodonsauroidea indet., Stereospondyli indet., and cf. Stereospondyli, as well as intercentra of small adult individual(s) which may belong to a new taxon. Although fragmentary, this new material allows taxonomic updates to the Triassic temnospondyl assemblages of Tanzania and Zambia and documents an interesting phylogenetic and ecological diversity. For example, among the Triassic mastodonsauroids of Zambia, Cherninia megarhina coexisted with Stanocephalosaurus pronus (Howie, 1970) in nonmarine environments. Similar to that of the South African Karoo Basin, these temnospondyl assemblages also illustrate the rapid recovery of the group after the Permian-Triassic mass extinction and contribute to a better understanding of the impact of this extinction on the tetrapod faunas of southern Pangea.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43250992","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 Mont-des-Récollets section (N France): a key site for the Ypresian-Lutetian transition at mid-latitudes – reassessment of the boundary criterion for the base-Lutetian GSSP","authors":"É. Steurbaut, D. Nolf","doi":"10.5252/geodiversitas2021v43a11","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a11","url":null,"abstract":"ABSTRACT Re-excavation of the famous Mont-des-Récollets quarry in northern France and re-interpretation of the adjacent Cassel borehole have led to the reconstruction of one of the most complete Upper Ypresian and Lutetian stratigraphic successions of the southern North Sea Basin. It includes the entire suite of formations and members, from the top of the Hyon Sand Formation (top NP12) to the base of the Maldegem Formation (mid-NP15), originally defined in central Belgium, extending the lateral distribution of most of these units up to northern France. The similarity in lithofacies and calcareous nannofossil assemblages and the identification of in situ specimens of Nummulites laevigatus (Bruguière, 1792) and Campanile giganteum (Lamarck, 1804) at the Mont-des-Récollets bear witness to direct north-south connections between the Belgian Basin and the Paris Basin during Biochron NP14 and early Biochron NP15. However, direct connections have only been intermittent. During late Biochron NP12 and Biochron NP13, both basins became disconnected because of lowering of the global sea level in combination with uplift of the Paris Basin. The massively reworked large-sized N. laevigatus and the presence of N. laevigatus-bearing sandstone blocks and lignitic pebbles at the base of the Lede Formation indicate a major erosion phase at the NP14-NP15 Biochron transition in the Belgian Basin. This was probably due to uplift of the Brabant Massif. The new Mont-des-Récollets data, including the introduction of a new genus (Luminocanthus n. gen.) and ten new species (Blackites minusculus n. sp., Blackites praeinflatus n. sp., Luminocanthus eolutetiensis n. gen., n. sp., Luminocanthus plenilutetiensis n. gen., n. sp., Martiniaster cecellanoriae n. sp., Nannoturba joceliniae n. sp., Sphenolithus quadricornutus n. sp., Sphenolithus recolletensis n. sp., Trochoaster nodosus n. sp. and Trochastrites pyramidalis n. sp.) have allowed to substantially refine the calcareous nannofossil stratigraphy. The subdivision of Zone NP13 into 3 subzones (NP13-a to NP13-c) as well as the major nannofossil turnover at the base of Zone NP14 and the nine nannofossil-events within Zone NP14 have been recognised throughout the Belgian Basin. Several of these have been recorded in the Paris Basin, the Hampshire Basin and the Aquitaine Basin, highlighting their interbasinal correlation potential. The nannofossil data provide for the first time evidence that the base of the ‘Chaumont-en-Vexin sands' (term informally introduced herein to designate the base of the historical Lutetian stratotype) and the base of Unit A4 in the upper Aalter Sand Fomation are coeval or nearly coeval. This is also the case for the base of the overlying units, the ‘Glauconie Grossière s.s.' (as redefined in the Paris Basin by Blondeau in 1980) and the Brussel Sand Formation (‘Bruxellian' as originally defined in Belgium by Dumont in 1839). This investigation and its continuation, detailed in a forthcoming study of the","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49419922","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 Thylacocephala, Eodollocaris keithflinti n. gen., n. sp., from the Mazon Creek Lagerstätte, Illinois, United States (c. 307 Ma) and redescription of other Mazon Creek thylacocephalans","authors":"Thomas Laville, J. Haug, C. Haug","doi":"10.5252/geodiversitas2021v43a10","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a10","url":null,"abstract":"ABSTRACT Thylacocephala is an enigmatic ingroup of Euarthropoda. Thylacocephalans, only known from Palaeozoic and Mesozoic fossils, are characterized by a particular anatomy: a prominent folded shield enveloping most of the body, large compound eyes, three pairs of large, presumably raptorial appendages and a trunk with 8-22 stout segments bearing swimming appendages. However, lifestyle(s) and phylogenetic relationships of Thylacocephala are still largely unknown. This study is focused on thylacocephalans from the Mazon Creek Lagerstätte (c. 307 Ma, Middle Pennsylvanian, Carboniferous). A new species is described from a siderite concretion of Mazon Creek: Eodollocaris keithflinti n. gen., n. sp. The new species displays a particular mixture of characters typical for Palaeozoic species on the one hand and Mesozoic species on the other hand. Additionally, new details of the appendages and of the trunk are provided for already known species from the same locality, namely Concavicaris georgeorum Schram, 1990 and Convexicaris mazonensis Schram, 1990. These new informations are helpful to better understand the possible lifestyle of these representatives of Thylacocephala.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49547182","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":"Osteological atlas of new lizards from the Phosphorites du Quercy (France), based on historical, forgotten, fossil material","authors":"G. Georgalis, A. Čerňanský, Jozef Klembara","doi":"10.5252/geodiversitas2021v43a9","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a9","url":null,"abstract":"ABSTRACT A long-forgotten, old collection of lizards from the Phosphorites du Quercy in southern France, housed in the Naturhistorisches Museum in Vienna (NHMW), is described in detail in this paper. The material, consisting of several almost complete cranial and postcranial disarticulated elements, originates from different, imprecisely known localities. Nevertheless, the completeness and exceptional preservation of many of these specimens permitted the identification of new taxa, as well as the recognition and better understanding of novel anatomical features of previously described forms. Among the specimens, the material described herein and referred to Cadurcogekko cf. piveteaui ranks among the most complete cranial remains of Paleogene gekkotans. A clarification about the type material of the previously described species Cadurcogekko verus Bolet, Daza, Augé & Bauer, 2015, is provided. A new species of lacertids is established, Pseudeumeces kyrillomethodicus n. sp. Additional, large lacertid material is referred to Mediolacerta Augé, 2005, representing also the largest one attributable to this genus. At least two glyptosaurine taxa are present in this collection, among which, the genus Paraplacosauriops Augé & Sullivan, 2006, is represented by exceptional cranial material, referred to Paraplacosauriops quercyi (Filhol, 1882). The completeness of the cranial material of Paraplacosauriops permits a more comprehensive understanding of its maxillary and mandibular anatomy. A detailed documentation of cranial and postcranial material for the genus Palaeovaranus Zittel, 1887-1890, is conducted. The new maxilla described herein allows a better understanding of the peculiar maxillary features of the genus Palaeovaranus. Emended diagnoses are provided for the genus Palaeovaranus and its type species Palaeovaranus cayluxi Zittel, 1887-1890. The parietal morphology of Palaeovaranus is analyzed in detail and intraspecific variation in this element is assessed. A new species of Palaeovaranus is established, Palaeovaranus lismonimenos n. sp., on the basis of an almost complete parietal that can be differentiated from that of Palaeovaranus cayluxi on the basis of a number of distinctive features. Additional, previously published specimens from Quercy are here referred to Palaeovaranus lismonimenos n. sp., representing younger individuals of this species, and photographs of this material is provided for the first time. The diversity of platynotans in the Paleogene of Europe is discussed and their distinction on the basis of parietal morphology is provided. According to the new emended diagnosis for Palaeovaranus, the genus Melanosauroides Kuhn, 1940, is revalidated herein to accommodate Melanosauroides giganteus Kuhn, 1940, from the late early or middle Eocene of Geiseltal, Germany. So far, Melanosauroides giganteus is solely known from its type area in Geiseltal, and all previously supposed occurrences of this taxon in Quercy are discarded. Abundant anguim","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48294340","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":"Pseudodrobna natator n. comb., a new link between crustacean faunas from the Jurassic of Germany and Cretaceous of Lebanon","authors":"Denis Audo, Norbert Winkler, S. Charbonnier","doi":"10.5252/geodiversitas2021v43a8","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a8","url":null,"abstract":"ABSTRACT Dendrobranchiate shrimps are abundant in Fossil-Lagerstätten (where fossils are exceptionally preserved). Despite their preservation, classifying them can be challenging as most diagnostic characters are based upon extant species. Penaeus natator Glaessner, 1945 (Late Cretaceous, Lebanon, Sahel Alma), is one of those cases in which the systematic assignment of the species can be difficult. It was assigned by “default” to Penaeus Fabricius, 1798, before being moved to Metapenaeopsis Bouvier, 1905. The recent description of Pseudodrobna kenngotti Winkler, 2017 (Late Jurassic, Germany, Schernfeld, a Solnhofen-type Fossil-Lagerstätte) shows that Penaeus natator should be assigned to Pseudodrobna Winkler, 2017. This attests once again the similarity in composition of crustacean faunas between Late Jurassic Solnhofen-type Fossil-Lagerstätten and the Late Cretaceous Fossil-Lagerstätten of Lebanon. We also discuss the palaeoecological significance of bilobed eyes, which occur in three species from the Late Cretaceous of Sahel Alma: Pseudodrobna natator n. comb., Palaeobenthonectes arambourgi (Roger, 1946) and Palaeobenthesicymus libanensis (Brocchi, 1875). These eyes seem to have evolved convergently due to the deep-water and dim-light palaeoenvironment of these three shrimp species.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43012914","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 material of the frog Hungarobatrachus szukacsi Szentesi & Venczel, 2010, from the Santonian of Hungary, supports its neobatrachian affinities and reveals a Gondwanan influence on the European Late Cretaceous anuran fauna","authors":"M. Venczel, Zoltán Szentesi, J. Gardner","doi":"10.5252/geodiversitas2021v43a7","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a7","url":null,"abstract":"ABSTRACT The Late Cretaceous anuran Hungarobatrachus szukacsi Szentesi & Venczel, 2010 was erected for isolated ilia and tibio-fibulae from the Santonian-age Iharkút locality, in northwestern Hungary. On the strength of ilial features, H. szukacsi was interpreted as a neobatrachian and possible ranoid, making it the only pre-Cenozoic occurrence for both clades in Laurasia. New ilia and the first examples of skull bones (incomplete frontoparietals, squamosals, maxillae, and angulosplenials) from the type locality provide new insights into the taxonomic distinctiveness, osteology, and evolutionary history of H. szukacsi. In addition to its diagnostic ilia (e.g., dorsal crest tall and ornamented laterally with prominent ridges; extensive interiliac tubercle developed across entire medial surface of acetabular region), H. szukacsi is characterized further by having a moderately hyperossified skull exhibiting such traits as frontoparietals, squamosals, and maxillae externally covered with prominent pit-and-ridge and weakly developed tuberculate ornament (i.e., exostosis), frontoparietals solidly fused along midline, frontoparietals expanded posterolaterally to form a broad squamosal process, squamosals expanded anteroposteriorly to form a plate-like lamella alaris, and maxilla articulating posteriorly with the quadratojugal to form a solid bony ‘cheek'. The first cladistic analysis to include H. szukacsi corroborates its neobatrachian status, but consistently places it among hyloids, rather than ranoids as originally proposed. Indications of hyloids on the African continent and in Madagascar during the Late Cretaceous, suggest that the ancestor of H. szukacsi may have dispersed from Africa, across the proto-Mediterranean and into Europe, prior to the Santonian.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49596164","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":"Les Thalattosuchia jurassiques de Normandie des collections Vautier et Morière : contexte historique et redécouverte des plastotypes","authors":"A. Brignon","doi":"10.5252/geodiversitas2021v43a6","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a6","url":null,"abstract":"RÉSUMÉ Abel Vautier (1794-1863) avait constitué à Caen, un musée privé éclectique dans lequel était conservée une importante collection paléontologique. Il avait fait l'acquisition de plusieurs spécimens remarquables de reptiles marins jurassiques de Normandie (Ichthyosauria, Plesiosauria et Thalattosuchia). Après sa mort, ces spécimens furent achetés en novembre 1863 par Jacques-Amand Eudes-Deslongchamps et intégrèrent en 1935 les collections de la Faculté des Sciences de Caen. Une autre personnalité caennaise, Pierre-Gilles Morière (1817-1888), avait également collecté plusieurs spécimens importants de Thalattosuchia dans le Jurassique de Normandie. Contrairement à Vautier, Morière ne cherchait pas à constituer une collection personnelle et déposait directement ses trouvailles à la Faculté de Caen. L'ensemble des pièces collectées par Vautier et Morière subirent néanmoins le même sort et furent détruites dans les bombardements de Caen en 1944. Cet article retrace l'histoire des spécimens les plus emblématiques de ces collections, à savoir notamment, l'holotype de « Metriorhynchus » blainvillei (J.-A. Eudes-Deslongchamps, 1867) trouvé en 1844 dans le Callovien inférieur de Sannerville (Calvados), l'holotype de Deslongchampsina larteti (J.-A. Eudes-Deslongchamps, 1866) découvert avant 1853 dans le Calcaire de Caen (Bathonien moyen) à Fleury-sur-Orne, l'holotype de « Metriorhynchus » brachyrhynchus (J.-A. Eudes-Deslongchamps, 1867) trouvé en 1864 dans le Callovien au Mesnil de Bavent (Calvados) et enfin un crâne entier de Teleidosaurus calvadosii (J.-A. Eudes-Deslongchamps, 1866), désigné ici lectotype de l'espèce, découvert en 1864 dans le Calcaire de Caen (Bathonien moyen) à Fleury-sur-Orne. Eudes-Deslongchamps avait fait faire, avec le soutien d'Henri Milne Edwards et du ministère de l'Instruction publique, des moulages en plâtre de ces spécimens. Ces plâtres furent réalisés entre 1866 et 1868 par Jean-Benjamin Stahl, chef de l'atelier de moulage du Muséum national d'Histoire naturelle. Ils furent distribués à différents musées et facultés des sciences en France. Des plastotypes de « Metriorhynchus » blainvillei, Deslongchampsina larteti, « Metriorhynchus » brachyrhynchus et de Teleidosaurus calvadosii dont l'origine était oubliée depuis longtemps ont pu ainsi être retrouvés dans plusieurs collections publiques françaises.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42607451","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":"Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco","authors":"Samir Zouhri, P. Gingerich, Bouziane Khalloufi, E. Bourdon, S. Adnet, S. Jouve, Najia Elboudali, Ayoub Amane, J. Rage, Rodolphe Tabuce, France de Lapparent de Broin","doi":"10.5252/geodiversitas2021v43a5","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a5","url":null,"abstract":"ABSTRACT In the Sahara Desert of southwestern Morocco, the Aridal Formation of Gueran is known for the world's richest Bartonian archaic whale assemblage, which includes both protocetids and basilosaurids. Gueran has also yielded another rich and diverse vertebrate fauna described in detail herein —The chondrichthyan assemblage of twelve species is quite similar to that of the Midawara Formation (Egypt). Actinopterygians include Siluriformes, Percomorpha and rostra of Cylindracanthus Leidy, 1856. Turtles are attributed to at least three indetermined species: two marine cryptodires – a cheloniid and a dermochelyid, and a possible littoral pleurodire, as found in Ad-Dakhla (Morocco) and Fayum (Egypt). The crocodylians comprise at least two longirostrine taxa, including a gavialoid that resembles the late Eocene-early Oligocene Eogavialis africanum Andrews, 1901 from Egypt. The second form is too fragmentary to be identified more precisely than Crocodyliformes indet. Two snake vertebrae belong to Pterosphenus cf. schweinfurthi Andrews, 1901. Two other incomplete snake vertebrae probably belong to Paleophiidae as well. Seabird remains belong to a gigantic soaring pseudo-toothed bird (Pelagornithidae) and constitute the earliest occurrence of the genus Pelagornis sp. Lartet, 1857. This material extends the fossil record of Pelagornis back in time by at least 10 million years. Based on their size and enamel microstructure, mammal dental fragments are attributed to the proboscidean ?Barytherium sp. The Bartonian age of the fauna, initially based on an archaeocete cetacean assemblage, is also supported by chondrichthyans. Affinities of the Gueran faunal assemblage are analyzed in comparison with those from other middle and upper Eocene deposits of North Africa and elsewhere.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41422800","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}