Alcheringa: An Australasian Journal of Palaeontology最新文献

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Yarravia oblonga Lang & Cookson, 1935 emended, from the Lower Devonian of Victoria, Australia Yarravia oblonga Lang & Cookson, 1935年修订,来自澳大利亚维多利亚的下泥盆纪
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1958257
F. Mcsweeney, J. Shimeta, J. Buckeridge
{"title":"Yarravia oblonga Lang & Cookson, 1935 emended, from the Lower Devonian of Victoria, Australia","authors":"F. Mcsweeney, J. Shimeta, J. Buckeridge","doi":"10.1080/03115518.2021.1958257","DOIUrl":"https://doi.org/10.1080/03115518.2021.1958257","url":null,"abstract":"Abstract Yarravia oblonga is emended here and adds to our knowledge of floral diversity during the late Silurian and Early Devonian of central Victoria, Australia. Examination of specimens and analysis with light microscopy have revealed its defining characteristics as a slender elongate fructification, with most of the dichotomies in the fructification confined to the sterile axes. The sporangia of Y. oblonga are located centrally with sterile axes on the outside curving up and over the apices. The original diagnosis of a synangium is discounted as it was an artefact of preservation, and Hedeia is now considered a heterotypic synonym of Yarravia, with the latter taking priority. Furthermore, the branching pattern of Yarravia is simple and demonstrates that it does not belong with the ‘trimerophyte grade’. The presence of Yarravia in South China is of palaeophytogeographical importance, as it suggests some exchange between the two regions or is evidence of convergent evolution. Fearghus R. McSweeney* [fearghus.mcsweeney@rmit.edu.au] School of Science, RMIT University, Swanston Street, Melbourne 3000, Australia; Jeff Shimeta [jeff.shimeta@rmit.edu.au] School of Science, RMIT University, Swanston Street, Melbourne 3000, Australia; John St. J. S. Buckeridge [john.buckeridge@rmit.edu.au] Earth & Oceanic Systems Group, RMIT University, GPO Box 2476, Melbourne, Australia.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117014092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Proviviparus talbragarensis gen. et sp. nov., the first viviparid snail from the Late Jurassic of Australia 澳洲晚侏罗世第一种胎生蜗牛——talbragarensis gen. et sp. nov.
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1940276
Michael Frese, W. Ponder
{"title":"Proviviparus talbragarensis gen. et sp. nov., the first viviparid snail from the Late Jurassic of Australia","authors":"Michael Frese, W. Ponder","doi":"10.1080/03115518.2021.1940276","DOIUrl":"https://doi.org/10.1080/03115518.2021.1940276","url":null,"abstract":"Abstract Extinct freshwater snails of the family Viviparidae can be found on all continents with the exception of Madagascar and Antarctica. These snails are usually thought to have evolved in the Early Jurassic of Laurasia. Our findings suggest that viviparids may have achieved an almost worldwide distribution by the Late Jurassic. Here we report viviparid snails from the Upper Jurassic Talbragar Fish Bed in New South Wales, Australia, and describe them as a new genus and species. This represents the first reliable record of the family Viviparidae from the Jurassic of Gondwana. One specimen shows a thin operculum and in another there is evidence of brooding. Michael Frese [ michael.frese@canberra.edu.au ], Faculty of Science and Technology, University of Canberra, Canberra, Australian Capital Territory 2601, Australia and Australian Museum Research Institute, College Street, Sydney, New South Wales 2010, Australia; Winston Ponder [wponder@bigpond.net.au ], Australian Museum Research Institute, College Street, Sydney, New South Wales 2010, Australia.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131584880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
New eodermapteran earwigs (Dermaptera) from the Middle Jurassic Jiulongshan Formation of China 中国中侏罗统九龙山组新始皮翅目蠼螋
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1965215
Shu Xiong, M. Engel, Lifang Xiao, D. Ren
{"title":"New eodermapteran earwigs (Dermaptera) from the Middle Jurassic Jiulongshan Formation of China","authors":"Shu Xiong, M. Engel, Lifang Xiao, D. Ren","doi":"10.1080/03115518.2021.1965215","DOIUrl":"https://doi.org/10.1080/03115518.2021.1965215","url":null,"abstract":"Abstract A new genus of eodermapteran earwigs, Aglyptoderma gen. nov., is described from the Middle Jurassic Jiulongshan Formation of Inner Mongolia, China. It comprises two new species—Aglyptoderma elongatum gen. et sp. nov. and Aglyptoderma cylindratum gen. et sp. nov. The genus belongs to the family Semenoviolidae, hitherto known only from the Late Jurassic of Kazakhstan. However, owing to significant differences in the form of the head, pronotum, tegmina and tarsomeres, the new genus is classified within a separate subfamily, Aglyptodermatinae subfam. nov. The features of the new genus are discussed in the context of existing hypotheses regarding post-Jurassic character-state transitions in the postabdomen of female Dermaptera. In particular, reduction of the cerci and internalization of the ovipositor across Archidermaptera, Eodermaptera, and Neodermaptera may relate to the variety of maternal care behaviours seen among earwigs. Shurong Xiong [2190802066@mail.cnu.edu.cn], Lifang Xiao [xiaolifangjxau@163.com], Dong Ren* [rendong@mail.cnu.edu.cn], College of Life Sciences and Academy for Multidisciplinary Studies, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing 100048, PR China; Michael S. Engel [msengel@ku.edu], Division of Entomology, Department of Ecology & Evolutionary Biology, Natural History Museum, University of Kansas, 1501 Crestline Drive – Suite 140, Lawrence, Kansas, 66045-4415, USA; Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY, 10024-5192, USA.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132946988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Pleistocene cetacean fossils from the coastal plain of Rio Grande do Sul in southern Brazil 来自巴西南部南里奥格兰德州沿海平原的更新世鲸类化石
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1966647
Thayara S. Carrasco, F. S. Buchmann
{"title":"Pleistocene cetacean fossils from the coastal plain of Rio Grande do Sul in southern Brazil","authors":"Thayara S. Carrasco, F. S. Buchmann","doi":"10.1080/03115518.2021.1966647","DOIUrl":"https://doi.org/10.1080/03115518.2021.1966647","url":null,"abstract":"Abstract Cetacean ear bones are useful for palaeontological studies because it is possible to identify most species based on their gross morphology, and thus glean information about past occurrences and distributions. This study describes cetacean tympanic bullae and periotics preserved in Middle–Late Pleistocene coastal barrier systems from Rio Grande do Sul in southern Brazil. The specimens were collected ex situ on the modern beach, and reveal the presence of the Franciscana dolphin, Pontoporia blainvillei, an indeterminate delphinid, the rorqual whale, Balaenoptera, and right whale, Eubalaena. Given the current diversity of dolphins and whales in the Atlantic Ocean, these fossils suggest that the reported diversity of Pleistocene cetaceans is probably underestimated. The barrier systems of Rio Grande do Sul are the only Brazilian deposits that have preserved Pleistocene cetacean remains to date. Thayara Silveira Carrasco* [thayaracarrasco@gmail.com], Laboratório de Estratigrafia e Paleontologia and Programa de Pós-graduação em Biodiversidade de Ambientes Costeiros, Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista, 11330-900 São Vicente, SP, Brazil; Francisco Sekiguchi Buchmann [paleonchico@yahoo.com.br], Laboratório de Estratigrafia e Paleontologia, Instituto de Biociências, Campus do Litoral Paulista, Universidade Estadual Paulista, 11330-900 São Vicente, SP, Brazil.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114814588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Lower Devonian (Pragian–Emsian) land plants from Alexandra: an early window into the diversity of Victorian flora from southeastern Australia 亚历山德拉的下泥盆世(Pragian-Emsian)陆地植物:澳大利亚东南部维多利亚时期植物多样性的早期窗口
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1971297
F. Mcsweeney, J. Shimeta, J. Buckeridge
{"title":"Lower Devonian (Pragian–Emsian) land plants from Alexandra: an early window into the diversity of Victorian flora from southeastern Australia","authors":"F. Mcsweeney, J. Shimeta, J. Buckeridge","doi":"10.1080/03115518.2021.1971297","DOIUrl":"https://doi.org/10.1080/03115518.2021.1971297","url":null,"abstract":"Abstract Numerous fragmentary plant fossils are described from the Lower Devonian outcrops near Alexandra, Victoria, southeastern Australia. These outcrops include Eglinton Cutting and two road cuttings on Mount Pleasant and Halls Flat roads previously examined by Isabel Cookson in 1935. Most plants are preserved as iron-stained impressions or coalified compressions lacking internal anatomy in fine-grained sandstone and siltstone. The vast majority of specimens examined proved to be little more than naked fragmentary axes often distributed seemingly randomly; it is the exceptions to these that are examined herein. Most of these specimens belong to the zosterophylls and isolated axes with emergences suggestive of a Gosslingiaceae affinity. Significantly, one specimen attributable to Cooksonia Lang, 1937, renalioid-like sporangia and specimens with isolated sporangia with emergences are recorded for the first time from Victoria. A discussion follows examining the possible reasons for the differences between the Alexandra and Walhalla assemblages, and it is postulated that the differing palaeocurrents indicate the terrestrial sources were from opposite directions. This easterly source for the Walhalla assemblage suggests a subaerial environment may have existed on the eastern side of the Melbourne Zone during the deposition of the Norton Gully Sandstone, earlier than the fluvial deposits of the Middle Devonian Cathedral Beds. Fearghus R. McSweeney FGS [ tidal75@gmail.com ], School of Science, RMIT University, Swanston Street, Melbourne 3000, Australia; Jeff Shimeta [ jeff.shimeta@rmit.edu.au ], School of Science, RMIT University, Swanston Street, Melbourne 3000, Australia; John St. J. S. Buckeridge FGS [ john.buckeridge@rmit.edu.au ], Earth & Oceanic Systems Group, RMIT University, GPO Box 2476.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125471367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A Guzhangian (late Middle Cambrian) fauna from the Gidgealpa 1 drillhole, Warburton Basin, South Australia 南澳大利亚Warburton盆地Gidgealpa 1钻孔古张期(中寒武纪晚期)动物群
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1962974
X. Sun, C. Bentley, J. Jago
{"title":"A Guzhangian (late Middle Cambrian) fauna from the Gidgealpa 1 drillhole, Warburton Basin, South Australia","authors":"X. Sun, C. Bentley, J. Jago","doi":"10.1080/03115518.2021.1962974","DOIUrl":"https://doi.org/10.1080/03115518.2021.1962974","url":null,"abstract":"Abstract A Cambrian Series 3 (Guzhangian, Boomerangian) fauna is described from Core 12 of the Gidgealpa 1 drillhole from the Warburton Basin, northeastern South Australia. There are four agnostoid taxa: Ammagnostus laiwuensis, Lejopyge calva, L. armata and an unassigned pygidium, and six polymerid trilobite taxa: Fuchouia sp., Dorypyge sp., Solenoparia changi sp. nov., Pianaspis sp., an unassigned cranidium and an unassigned pygidium. This fauna suggests a correlation with the Goniagnostus nathorsti Zone or the lower part of the Lejopyge laevigata Zone (Boomerangian on the northern Australian biostratigraphic scheme), with the latter preferred. These are the first published descriptions of fossils of this age from the Warburton Basin. Xiaowen Sun [Xiaowen_s@yahoo.com.au], Sun Petroleum Geoservices, 4 Jolie Grove, Box Hill, Victoria 3128, Australia; Christopher J. Bentley [ bigfossil@bigpond.com], 30 Albert Street, Clare, South Australia, 5453, Australia; James B. Jago [jim.jago@unisa.edu.au], University of South Australia–STEM, Mawson Lakes, South Australia 5095, Australia.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132623364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New data on one of the first plesiosaur (Reptilia, Sauropterygia) skeletons recovered from Antarctica, with comments on the dorsal and sacral regions of elasmosaurids 在南极洲发现的第一批蛇颈龙(爬行纲,蜥脚类)骨骼的新数据,以及对拉丝龙的背部和骶骨区域的评论
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1958378
J. P. O’Gorman, Franco Aspromonte, M. Reguero
{"title":"New data on one of the first plesiosaur (Reptilia, Sauropterygia) skeletons recovered from Antarctica, with comments on the dorsal and sacral regions of elasmosaurids","authors":"J. P. O’Gorman, Franco Aspromonte, M. Reguero","doi":"10.1080/03115518.2021.1958378","DOIUrl":"https://doi.org/10.1080/03115518.2021.1958378","url":null,"abstract":"Abstract Elasmosaurids are among the most frequently recorded marine reptile fossils from the Campanian–Maastrichtian strata of Antarctica. Here, we describe one of the earliest quarried specimens, MLP 82-I-28-1, which is identified as a non-aristonectine elasmosaurid and phylogenetically nested within Weddellonectia. An ancestral states analysis of dorsal and sacral vertebral counts suggests that weddellonectian elasmosaurids plesiomorphically possessed between 17 and 18 dorsal vertebrae. The comparatively high count of 24 dorsal vertebrae observed in aristonectine elasmosaurids, such as Aristonectes quiriquinensis, thus likely represents a derived state correlated with the acquisition of larger body size. José O’Gorman [joseogorman@fcnym.unlp.edu.ar] División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA La Plata; CONICET: Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina, Godoy Cruz 2290, C1425FQB, CABA, Argentina; Franco Aspromonte [fran.aspromonte@gmail.com] División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA La Plata; Marcelo Reguero [mreguero@dna.gov.ar] División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA La Plata; Instituto Antártico Argentino, 25 de Mayo 1143, B1650HMK, San Martín, Buenos Aires, Argentina.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"360 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132104218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Revision of Eoiocossus (Insecta, Hemiptera, Palaeontinidae) from the Middle Jurassic of Northeastern China 中国东北中侏罗统始虫纲(昆虫亚纲,半翅目,古蚁科)的订正
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-07-03 DOI: 10.1080/03115518.2021.1964038
Ying Wang, Junhui Liang, Chungkun Shih, D. Ren
{"title":"Revision of Eoiocossus (Insecta, Hemiptera, Palaeontinidae) from the Middle Jurassic of Northeastern China","authors":"Ying Wang, Junhui Liang, Chungkun Shih, D. Ren","doi":"10.1080/03115518.2021.1964038","DOIUrl":"https://doi.org/10.1080/03115518.2021.1964038","url":null,"abstract":"Abstract The diagnosis of the genus Eoiocossus is emended based on new material of Eoiocossus conchatus comb. nov. from an outcrop of the Middle Jurassic Jiulongshan Formation at Daohugou Village in Ningcheng County, Inner Mongolia, China. This new material, with its complete fore- and hind wing, provides previously unknown hind wing characters for the genus Eoiocossus. In the hind wing, vein M is bifurcated into M1 + 2 and M3 + 4 basally; M1 + 2 branches soon after arising from M; M3 + 4 branched with stem of M3 + 4 long. A key and emended diagnosis is provided for Eoiocossus based on this new material. Ying Wang* [wangying@bmnh.org.cn], Beijing Museum of Natural History, 126 Tianqiao South St, Dongcheng District, Beijing, 100050, PR China; Junhui Liang [liangjh0602@126.com ], Tianjin Natural History Museum, 31 Youyi Road, Hexi District, Tianjin, 300201, PR China; Chungkun Shih [chungkun.shih@gmail.com ], College of Life Sciences and Academy for Multidisciplinary Studies, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing, 100048, PR China; Also affiliated with: Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013, USA; Dong Ren [rendong@mail.cnu.edu.cn ], College of Life Sciences and Academy for Multidisciplinary Studies, Capital Normal University, 105 Xisanhuanbeilu, Haidian District, Beijing, 100048, PR China.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"509 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114001771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification of growth cessation in dinosaurs based on microscopy of long bone articular surfaces: preliminary results 基于长骨关节面显微镜的恐龙生长停止鉴定:初步结果
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-04-03 DOI: 10.1080/03115518.2021.1921273
B. Rothschild, F. Witzmann
{"title":"Identification of growth cessation in dinosaurs based on microscopy of long bone articular surfaces: preliminary results","authors":"B. Rothschild, F. Witzmann","doi":"10.1080/03115518.2021.1921273","DOIUrl":"https://doi.org/10.1080/03115518.2021.1921273","url":null,"abstract":"Abstract As applied to bone, ‘determinate growth’ identifies an upper limit to size and the point when normal endochondral ossification ceases. This contrasts with ‘indeterminate growth’, which proceeds through the entire life of the animal. In this study, a non-destructive method, epi-illumination surface microscopy of the articular surfaces of long bones, is applied for the first time in 40 taxa of non-avian dinosaurs to determine cessation of endochondral growth. Thereby, the presence or absence of articular vascular channels between the endochondral bone and the cartilage is assessed. As articular vascular channels are the major source of nutrients for continued longitudinal growth, atrophy or loss of those channels would preclude continued growth of bone. We correlated our findings with published histological data and bone length measurements. We found articular vascular channels in all assessed dinosaur groups, but some individuals showed a loss of detectable articular vascular channels – what we interpret as evidence of longitudinal skeletal growth cessation. This observation contrasts with the hypothesis of continuous indeterminate growth in dinosaurs, at least for the taxa identified here, in which channels have been documented as closed or closing over. The new method introduced here provides a phylogenetic tool for definitively distinguishing new ‘dwarf’ species from juveniles of known species. Furthermore, this study confirms the rarity of skeletally mature dinosaurs discovered to date and indicates that we have only begun to witness the full extent of dinosaur growth. Bruce M. Rothschild [spondylair@gmail.com], Carnegie Museum, 4400 Forbes Ave, Pittsburgh, PA 15213, USA; Florian Witzmann* [florian.witzmann@mfn.berlin], Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121279721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A new Tithonian ophthalmosaurid ichthyosaur from Coahuila in northeastern Mexico 墨西哥东北部科阿韦拉发现的新泰坦纪眼龙鱼龙
Alcheringa: An Australasian Journal of Palaeontology Pub Date : 2021-04-03 DOI: 10.1080/03115518.2021.1922755
Jair I. Barrientos-Lara, J. Alvarado‐Ortega
{"title":"A new Tithonian ophthalmosaurid ichthyosaur from Coahuila in northeastern Mexico","authors":"Jair I. Barrientos-Lara, J. Alvarado‐Ortega","doi":"10.1080/03115518.2021.1922755","DOIUrl":"https://doi.org/10.1080/03115518.2021.1922755","url":null,"abstract":"Abstract Historically, Mexican Jurassic ichthyosaurs have been referred to European representatives of the cosmopolitan family-level clade Ophthalmosauridae. Here, we describe one of the most skeletally complete Mexican ichthyosaur fossils discovered to date. This specimen was recovered from Late Jurassic (Tithonian) deposits of the La Caja Formation exposed near Gómez Farias in the Saltillo municipality of Coahuila, northern Mexico. The unique morphology of the external nasal opening, which is sub-divided by the dorsal process of the maxilla, an anteroposteriorly elongate lacrimal, and the presence of an elongate linear contact between the lacrimal and prefrontal identify these remains as a new genus and species—Parrassaurus yacahuitztli gen. et sp. nov. Other diagnostic character states include an extremely elongate prenarial rostrum, a proportionately large subnarial versus supranarial process on the premaxilla, anterior bordering of the supratemporal fenestra by the frontal, and an articular contact between the humerus and intermedium that separates the ulna and radius. Parrassaurus yacahuitztli represents the second platypterygiine taxon recorded from Mexico to date, and thus demonstrates a greater diversity of North American ophthalmosaurids than has been previously suspected. Jair Israel Barrientos-Lara* [j4ir@me.com] and Jesús Alvarado-Ortega [alvarado@geologia.unam.mx], Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de la Investigación S/N, Ciudad Universitaria, Delegación Coyoacán, Ciudad de México, 04510 México.","PeriodicalId":272731,"journal":{"name":"Alcheringa: An Australasian Journal of Palaeontology","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132652710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
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