Geodiversitas最新文献

{"title":"Le Jurassique du Jebel Ressas (Tunisie). Identification du Sinémurien supérieur dans la Formation Zaghouan. Précisions stratigraphiques et paléobiogéographiques sur le Sinémurien de Tunisie","authors":"P. Fauré, Nejla Sekatni, Mohamed Sabri Arfaoui, R. Alouani","doi":"10.5252/geodiversitas2021v43a4","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a4","url":null,"abstract":"RÉSUMÉ La révision de la succession lithostratigraphique du Jurassique du Jebel Ressas (Dorsale tunisienne, Tunisie) permet d'identifier toutes les formations déjà définies par ailleurs dans la Dorsale tunisienne. La Formation Zaghouan y est nouvellement datée du Sinémurien supérieur par des ammonites appartenant aux chronozones à Obtusum (sous-chronozone à Stellare) et à Raricostatum (sous-chronozone à Raricostatum). Six taxons d'Ammonitina appartenant aux genres Asteroceras (A. gr. saltriense (Parona, 1896), A. cf. meridionalis Dommergues, Meister & Mettraux, 1990), Arnioceras (A. gr. ceratitoides (Quenstedt, 1849) – rejectum Fucini, 1902), Epophioceras (E. cf. landrioti (d'Orbigny, 1850)) et Paltechioceras (P. bavaricum (Böse, 1894), P. cf. charpentieri (Schafhäult, 1847)) sont décrits et figurés. Ces ammonites permettent de corréler la « Formation Zaghouan » avec les « Niveaux condensés du sommet de la Formation Oust », déjà bien connus pour leur riche ammonitofaune sinémurienne et dont les âges sont ici réévalués. Les affinités paléobiogéographiques des ammonites du Sinémurien de Tunisie sont discutées.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44910355","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 freshwater and terrestrial turtles from Monte Pila and Fuenmayor (La Rioja, northern Spain): new data on the lower Miocene turtle diversity of the Ebro Basin","authors":"A. Pérez‐García, Oier Suárez-Hernando, J. Hernández, S. García, X. Murelaga","doi":"10.5252/geodiversitas2021v43a3","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a3","url":null,"abstract":"ABSTRACT Abundant turtle fossils from two lower Miocene localities in which this lineage had not previously been studied are described herein. The localities are Monte Pila and Fuenmayor, which are 10 km apart, both located in the Autonomous Community of La Rioja (northern Spain), in the Ebro Basin. Information about the turtles from the lower Miocene levels in this basin was until now restricted to the finds made in the MN3 biozone of the Bardenas Reales of Navarre. Several turtle taxa had been recognized there. However, the material attributed to each of them was scarce. Monte Pila and Fuenmayor are located in biozone MN2. The remains of turtles are abundant in both sites. A terrestrial lineage, recognized at Monte Pila, is not represented in the Bardenas Reales fauna of Navarre. It represents the first record of Titanochelon Pérez-García & Vlachos, 2014 in La Rioja and is one of the oldest member of this genus, being assigned to Titanochelon cf. bolivari (Hernández-Pacheco, 1917). The only lineage of turtles identified in Fuenmayor, and the most abundant in Monte Pila, is Ptychogasterinae. All material of this clade of freshwater turtles identified there is compatible with a single form, for which a high range of intraspecific variability is recognized. It is attributed to Ptychogaster (Temnoclemmys) cf. bardenensis Murelaga, Lapparent de Broin, Pereda Suberbiola & Astibia, 1999, this species having been recognized, until now, as exclusive to the Bardenas Reales of Navarre.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41730582","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":"Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda)","authors":"J. Devillez, S. Charbonnier","doi":"10.5252/geodiversitas2021v43a2","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a2","url":null,"abstract":"ABSTRACT Erymoid lobsters (Crustacea, Decapoda, Erymoidea) are an important component of Mesozoic crustacean faunas in Europe, especially during the Jurassic. With 36 species reported, these lobsters reach their highest diversity during the Late Jurassic. After the review presented here, 23 species belonging to Eryma Meyer, 1840 (11 species), Palaeastacus Bell, 1850 (2 species), Pustulina Quenstedt, 1857 (2 species) and Stenodactylina Beurlen, 1928 (8 species) remain valid. One new species is described: Stenodactylina shotoverigiganti n. sp., and Eryma pseudoventrosa Beurlen, 1928 is integrated to Stenodactylina. We also notice the oldest representative of Enoploclytia M'Coy, 1849, known by a single specimen unidentified at specific level. Eryma ventrosum (Meyer, 1835) is the most common species in Western Europe, and may be seen as emblematic of the Middle-Late Jurassic. Moreover, the lithographic limestones of Germany yield an exceptionally diversified erymoid fauna, with four genera (Eryma, Palaeastacus, Pustulina, Stenodactylina) and 11 species listed. All the Late Jurassic representatives of Palaeastacus were found in this lithology. Finally, the examination of some specimens allows the observation of the strong effects of the decortication on the ornamentation of the erymoids and the resulting taxonomic issues.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43041763","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 nearly complete skeleton of the oldest definitive erycine boid (Messel, Germany)","authors":"Krister T. Smith, A. Scanferla","doi":"10.5252/geodiversitas2021v43a1","DOIUrl":"https://doi.org/10.5252/geodiversitas2021v43a1","url":null,"abstract":"ABSTRACT A nearly complete skeleton of an erycine boid is described from the Ypresian-Lutetian (early-middle Eocene) site of Messel, Germany, for which we propose the name Rageryx schmidi n. gen., n. sp. The animal had a total length of c. 52 cm, with c. 258 vertebrae. In skull proportions it is similar to ungaliophiine boids, especially Ungaliophis, and to Tropidophis. The proportions and distinctive accessory processes of the distal caudal vertebrae that are common to all living erycine boids are present in the specimen, although the processes are not as elaborate as in many extant species. The premaxilla was not protruded to form a wedge-shaped snout, and the nasofrontal joint does not appear to show any special buttressing, unlike in many burrowing snake species. Furthermore, the inner ear lacks adaptations to an actively burrowing mode of life. We conclude that the animal, while it was probably secretive, was not fossorial. Phylogenetic analyses using maximum parsimony and Bayesian inference place Rageryx schmidi n. gen., n. sp. unambiguously on the stem of the North American clade (Lichanura + Charina). If this relationship is accurate, it provides further support for a common Euro-American squamate fauna in the early Eocene. The majority of known Messel snake taxa are small-bodied with a small gape, suggesting that such forms may have played a greater role in the early evolutionary radiation of Booidea than their present diversity would suggest.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43810033","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":"Cranial anatomy of Andinodelphys cochabambensis, a stem metatherian from the early Palaeocene of Bolivia","authors":"C. de Muizon, Sandrine Ladevèze","doi":"10.5252/geodiversitas2020v42a30","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a30","url":null,"abstract":"ABSTRACT Andinodelphys cochabambensis Marshall & Muizon, 1988 is one of the best preserved metatherian species from the early Palaeocene fauna of Tiupampa (Bolivia). It is represented by five almost complete skulls, three of them being securely associated to sub-complete to partial skeleton. Four skulls could be extracted from a block including several intermingled skeletons. The present paper provides a thorough description of the dental, cranial, and dentary anatomy of A. cochabambensis. The cranial anatomy of A. cochabambensis is similar to that of Pucadelphys andinus. The skull of Andinodelphys however differs from that of Pucadelphys in its larger size and proportionally longer rostrum. Other differences include the presence, in Andinodelphys, of large anteriorly protruding I1s, small palatal vacuities, a transverse canal, and a small hypotympanic sinus. Andinodelphys has the same dental formula as Pucadelphys (I 5/4, C 1/1, P 3/3, M4/4), the plesiomorphic condition for metatherians. Furthermore, both genera share the lack a tympanic process of the alisphenoid, a deep groove for the internal carotid artery at the anterior apex of the promontorium, a small prootic canal perforating the lateral edge of the petrosal and opening laterally in the deep sulcus for the prootic sinus, and a vestigial anterior lamina of the petrosal. Dentally Andinodelphys closely resembles Pucadelphys, the two genera differing in the larger size of the former and in the inconstant presence in the former of a twinned stylar cusp C. Although 25% smaller, the cheek teeth of Andinodelphys closely resemble those of Itaboraidelphys camposi from the early Eocene of Itaboraí (Brazil). As far as dental morphology is concerned, both genera are likely to have diverged from a direct common ancestor, probably Andinodelphys-like, with Itaboraidelphys displaying more derived dental structures. Two isolated petrosal from Itaboraí (Type 2 petrosals) are morphologically close to those of Andinodelphys but distinctly larger. In this paper, a previous interpretation including the teeth of Itaboraidelphys and these petrosals in the same taxon is followed. A phylogenetic analysis retrieved Itaboraidelphys as a sister taxon of the clade Pucadelphys + Andinodelphys, thus lending support to inclusion of the former in the Pucadelphyidae. Three sets of parsimony analyses were performed. A first set of analyses (with all characters) retrieved a strict consensus tree with a clade as follows: (pucadelphyids, (deltatheroidans (stagodontids, Gurlin Tsav skull-GTS), sparassodonts)). An implied weighting analysis with the same data matrix placed the stagodontids in an early diverging position but retained a clade (pucadelphyids, (deltatheroidans, (GTS, sparassodonts))), the deltatheroidans, being therefore inserted in the pucadelphydans. This result implies an independent arrival of pucadelphyids and sparassodonts to South America, which consequently must have been present in North America in the Lat","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42676459","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":"Contribution des motifs colorés résiduels dans la discrimination d'espèces nouvelles de Cryptochorda Mörch, 1858 (Mollusca: Gastropoda: Harpidae) de l'Éocène du bassin de Paris et du Cotentin","authors":"Jean-Michel Pacaud, Frédéric Sautereau","doi":"10.5252/geodiversitas2020v42a29","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a29","url":null,"abstract":"RÉSUMÉ L'observation sous éclairage ultraviolet de motifs colorés résiduels sur les coquilles de très nombreux gastéropodes cénozoïques fournit des caractères permettant d'affiner la description des espèces fossiles. Nous appliquons ici cette méthode à la discrimination de trois espèces de Cryptochorda de l'Éocène du bassin de Paris et du Cotentin confondues jusqu'ici avec l'espèce classique Cryptochorda (s.str.) stromboides (Hermann, 1781). Ces espèces sont nommées: Cryptochorda (s.str.) altavesna n. sp., C. (s. str.) neptis n. sp. et C. (s.str.) cosediensis n. sp. La répartition stratigraphique et géographique de l'espèce type C. (s.str.) stromboides est ainsi redéfinie. Cryptochorda (s.str.) teae n. sp. est également décrite de l'Yprésien (Éocène inférieur) d'Italie. Une revue historique de la littérature portant sur la taxonomie du genre est donnée et une notice biographique est fournie pour Jean Hermann, descripteur de l'espèce type du genre Cryptochorda.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45783126","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":"Revision of the cranial anatomy of Ophisaurus acuminatus Jörg, 1965 (Anguimorpha, Anguidae) from the late Miocene of Germany","authors":"Jozef Klembara, A. Čerňanský","doi":"10.5252/geodiversitas2020v42a28","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a28","url":null,"abstract":"ABSTRACT The anguine species Ophisaurus acuminatus Jörg, 1965 is known on the basis of only one specimen consisting of skull bones and osteoderms from the late Miocene (MN 9) Höwenegg/Hegau locality in Germany. Since its first description, several other new species of Ophisaurus Daudin, 1803 have been described from various Miocene localities in Europe. The diagnoses of these new species are based mostly on characters on the parietal and partially frontal bones. Although most of the cranial elements of O. acuminatus are well preserved, its parietal is absent. The knowledge of the detailed anatomy of this anguine species is crucial for the understanding of its interrelationship within the genus Ophisaurus. For our re-study of this specimen we used a high-resolution X-ray microcomputed tomography. The application of this method enabled: 1) to reveal the anatomy of not visible portions of the previously described bones; 2) to discover the bones completely or almost completely embedded in the sediment; and 3) to identify previously not determined skull bones. Our study enabled to identify three distinguished features for this species and confirmed the validity of the species O. acuminatus.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44181454","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":"Late Triassic to Early Jurassic radiolarian, conodont and ammonite assemblages from the Tavuscayiri block, Mersin Mélange, southern Turkey: Time constraints for the T/J boundary and sedimentary evolution of the southern margin of the northern Neotethys","authors":"U. K. Tekin, L. Krystyn, C. Okuyucu, Yavuz Bedi, Kaan Sayıt","doi":"10.5252/geodiversitas2020v42a27","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a27","url":null,"abstract":"ABSTRACT The Mersin Mélange (northwest of Mersin city) includes a variety of large sedimentary blocks/tectonic slices of Palaeozoic and Mesozoic origins. Of these, the latter represents facial and tectonostratigraphic counterparts of the Beysehir-Hoyran Nappes (remnants of the northern Neotethys). The Tavuscayiri Block, located at the center of the mélange and close to the Orbuklukeli hill, is one of such Mesozoic occurrences, with a continuous pelagic sequence from the Upper Triassic to Lower Jurassic. At the Orbuklukeli hill, a succession of middle Norian to Toarcian age has been precisely dated, which starts with conodont assemblages for the Norian and Rhaetian and includes radiolarians for the upper Rhaetian. An acidic tuff layer corresponds to the T-J boundary, which passes above to an increasingly dominating chert-bearing limestone series, marking a gradually deepening-upward of the sequence. The early Hettangian radiolarians are poorly represented, but diverse and well-preserved radiolarians have been retrieved from the middle Hettangian to the Pliensbachian. A total of eighty-five taxa, including fourteen new species, have been determined. In addition to these, one new genus (Praeudalia Tekin, n. gen.) has been described from the Rhaetian part of the section. The top of the section is represented by nodular limestones in Ammonitico rosso facies, including a diverse Toarcian ammonite fauna. All lithologies of the Orbuklukeli section along the Tavuscayiri Block can be correlated with the previously described lithologies of the Kayabasi Group/Formation in the Bozkir Unit, and Gülbahar/Gümüslü units in the Lycian Nappes.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45430155","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":"Anatomical preservation of silicified Corylites J.S.Gardner leaves from the Paleocene maar lake of Menat (Puy-de-Dôme, France)","authors":"D. Uhl, A. Jasper, M. Wuttke","doi":"10.5252/geodiversitas2020v42a26","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a26","url":null,"abstract":"ABSTRACT Uhl D., Jasper A. & Wuttke M. 2020. — Anatomical preservation of silicified corylites J.S.Gardner leaves from the Paleocene maar lake of Menat (Puy-de-Dôme, France). geodiversitas 42 (26): 485-492. http://geodiversitas.com/42/26 The late Paleocene fossil lagerstätte Menat in France is well known for its wealth of excellently preserved fossil plants and insects. Although the flora from this locality is regarded as characteristic for the late Thanetian in Western and Central Europe, there is a noteworthy lack of modern paleobotanical studies on this locality. The few existing studies on plant megafossils utilized only the gross morphology of leaves and carpological material for taxonomic questions, whereas anatomical data (i.e. from cuticles and permineralizations) have been completely neglected. The present study provides the first data on anatomically preserved internal tissues of leaves assigned to Corylites macquarrii (Forbes) Heer from this locality. Cell walls are preserved as silicates, whereas cell lumina are mostly empty. On occasion, cell lumina are filled with foam-like, porous silica. Anatomical preservation of these tissues is probably related to early diagenetic silicification of plant cell walls. Although at the moment nothing can be said about the source of the SiO2 it is likely that it is related to the volcanic origin of the Menat maar and/or volcanic activities in the vicinity of the lake during deposition of the sediments.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46506998","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 oldest erymnochelyine turtle skull, Ragechelus sahelica n. gen., n. sp., from the Iullemmeden basin, Upper Cretaceous of Africa, and the associated fauna in its geographical and geological context","authors":"France de Lapparent de Broin, L. Chirio, R. Bour","doi":"10.5252/geodiversitas2020v42a25","DOIUrl":"https://doi.org/10.5252/geodiversitas2020v42a25","url":null,"abstract":"ABSTRACT We describe the skull of Ragechelus sahelica, n. gen., n. sp., a pleurodiran Pelomedusoides turtle, the oldest skull known of the Erymnochelyinae. The specimen comes from the surroundings of Indamane village, from a littoral late Maastrichtian level of the Iullemeden sedimentary basin (southwestern Niger, Africa). It is compared on the one hand to the members of the subfamily including remains from the neighboring Ibeceten locality, but from an underlying continental Senonian, and, on the other hand, particularly to the bothremydid Nigeremys gigantea (Bergounioux & Crouzel, 1968), from a littoral Maastrichtian level close to that of Indamane, and from a closer to Indamane locality than Ibeceten. The associated fauna is reviewed in its stratigraphic context. Palaeogeographic considerations and systematic relationships indicate Erymnochelyinae widely diversified, in Africa from that time onwards, up to these days in Madagascar and notably with incursions in Western Europe during the Eocene times.","PeriodicalId":55111,"journal":{"name":"Geodiversitas","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47015210","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}