Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1958257
F. Mcsweeney, J. Shimeta, J. Buckeridge
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.
摘要本文对澳大利亚维多利亚中部地区晚志留世和早泥盆世的亚拉维亚(Yarravia oblonga)进行了修订，增加了我们对植物多样性的认识。标本检查和光学显微镜分析显示其定义特征为细长的果实，果实中的大多数二分类局限于不育轴。长圆形酵母孢子囊位于中央，无菌轴在体外向上弯曲并在顶端上方。最初对synangium的诊断被打折，因为它是保存的人工制品，Hedeia现在被认为是Yarravia的异型同义词，后者优先考虑。此外，Yarravia的分支模式简单，表明它不属于“三生植物级”。雅拉维亚在华南地区的存在具有重要的古植物地理学意义，因为它表明两个地区之间存在某种交换或趋同演化的证据。Fearghus R. McSweeney* [fearghus.mcsweeney@rmit.edu.au]澳大利亚墨尔本皇家理工大学理学院，斯旺斯顿街，墨尔本3000;Jeff shimata [jeff.shimeta@rmit.edu.au]澳大利亚墨尔本皇家理工大学理学院，斯旺斯顿街，墨尔本3000;John St. J. S. Buckeridge [john.buckeridge@rmit.edu.au] RMIT大学地球与海洋系统组，GPO Box 2476，墨尔本，澳大利亚。
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1940276
Michael Frese, W. Ponder
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.
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1965215
Shu Xiong, M. Engel, Lifang Xiao, D. Ren
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.
摘要报道了中侏罗统内蒙古九龙山组古皮目蠼螋一新属——Aglyptoderma gen. nov.。它包括两个新种——长形鳞片皮(Aglyptoderma elongatum gen. et sp. 11)和圆柱形鳞片皮(Aglyptoderma圆柱形鳞片皮gen. et sp. 11)。该属属于鳞片皮科，迄今只在哈萨克斯坦晚侏罗世发现。然而，由于头部、前角、腱膜和跗骨的形态存在显著差异，该新属被分类为一个单独的亚科，Aglyptodermatinae亚科。11 .在关于雌性皮翅目后腹部特征-状态转变的现有假设的背景下，讨论了新属的特征。特别是，在巢翅目、巢翅目和新翅目中，产卵器的减少和内化可能与土蜈蚣中所见的各种母性护理行为有关。熊淑荣[2190802066@mail.cnu.edu.cn]，肖丽芳[xiaolifangjxau@163.com]，任东* [rendong@mail.cnu.edu.cn]，首都师范大学生命科学学院，北京市海淀区西三环北路105号，100048;Michael S. Engel [msengel@ku.edu]，美国堪萨斯州劳伦斯市Crestline Drive 1501号140室，美国堪萨斯大学自然历史博物馆生态与进化生物学系昆虫学部;美国自然历史博物馆无脊椎动物部，纽约79街中央公园西，10024-5192，美国。
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1966647
Thayara S. Carrasco, F. S. Buchmann
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.
鲸类耳骨对古生物学研究非常有用，因为可以根据它们的大体形态识别大多数物种，从而收集有关过去发生和分布的信息。本研究描述了巴西南部南里奥格兰德州中晚更新世海岸屏障系统中保存的鲸类鼓室泡和周期。这些标本是在现代海滩上非原位收集的，揭示了弗朗西斯卡纳海豚，Pontoporia blainvillei，一种不确定的海豚，须鲸，Balaenoptera和露脊鲸，Eubalaena的存在。鉴于目前大西洋中海豚和鲸鱼的多样性，这些化石表明，报道的更新世鲸类的多样性可能被低估了。南里奥格兰德州的屏障系统是迄今为止巴西唯一保存了更新世鲸类动物遗骸的沉积物。Thayara Silveira Carrasco* [thayaracarrasco@gmail.com]， Laboratório古生物学研究与环境生物多样性研究项目Pós-graduação，圣保罗滨海校区研究中心Biociências，圣保罗滨海大学，11330-900 s o Vicente, SP，巴西;Francisco Sekiguchi Buchmann [paleonchico@yahoo.com.br]， Laboratório古生物学研究所Biociências，保利斯塔滨海校区，保利斯塔大学，11330-900 s o Vicente, SP，巴西。
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1971297
F. Mcsweeney, J. Shimeta, J. Buckeridge
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.
摘要在澳大利亚东南部维多利亚亚历山德拉附近的下泥盆世露头中发现了大量的植物化石碎片。这些露头包括埃格林顿切割和两个道路切割在普莱森特山和霍尔斯平坦的道路上，伊莎贝尔·库克森曾在1935年检查过。大多数植物以铁染印痕或缺乏内部解剖结构的联合压痕保存在细粒砂岩和粉砂岩中。经检验的绝大多数标本被证明不过是裸露的断片轴线，往往看似随机分布;这里讨论的是这些例外情况。这些标本大多属于带状虫叶和分离轴，其突现表明其与鹅壳科有亲缘关系。值得注意的是，在维多利亚首次记录了一个属于Cooksonia Lang(1937)的标本，类肾状孢子囊和分离孢子囊标本。接着讨论了亚历山德拉和瓦尔哈拉组合之间差异的可能原因，并假设不同的古洋流表明陆源来自相反的方向。沃尔哈拉组合的东部来源表明，在诺顿沟砂岩沉积期间，墨尔本地区的东侧可能存在陆上环境，比中泥盆世大教堂层的河流沉积更早。Fearghus R. McSweeney FGS [tidal75@gmail.com]， RMIT大学理学院，澳大利亚墨尔本斯旺斯顿街3000;Jeff shimmeta [jeff.shimeta@rmit.edu.au]， RMIT大学理学院，斯旺斯顿街，澳大利亚墨尔本3000;John St. J. S. Buckeridge FGS [john.buckeridge@rmit.edu.au]，地球与海洋系统组，RMIT大学，GPO Box 2476。
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1962974
X. Sun, C. Bentley, J. Jago
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.
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1958378
J. P. O’Gorman, Franco Aspromonte, M. Reguero
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.
{"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}
Pub Date : 2021-07-03DOI: 10.1080/03115518.2021.1964038
Ying Wang, Junhui Liang, Chungkun Shih, D. Ren
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.
{"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}
Pub Date : 2021-04-03DOI: 10.1080/03115518.2021.1921273
B. Rothschild, F. Witzmann
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.
{"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}
Pub Date : 2021-04-03DOI: 10.1080/03115518.2021.1922755
Jair I. Barrientos-Lara, J. Alvarado‐Ortega
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.
历史上，墨西哥侏罗纪鱼龙被认为是眼龙科的欧洲代表。在这里，我们描述了迄今为止发现的最完整的墨西哥鱼龙化石之一。这个标本是从墨西哥北部科阿韦拉萨尔提略市Gómez法里亚斯附近暴露的拉卡哈组晚侏罗世(梯东纪)沉积物中发现的。鼻外开口的独特形态，被上颌骨的背突，前后细长的泪道，以及泪道和前额叶之间细长的线状接触的存在，确定了这些遗骸是一个新的属和种- parrassaurus yacahuitzli gen. et sp. 11 .其他诊断特征状态包括极其细长的喙前喙，上颌骨上的鼻下和鼻上的比例较大的喙下突。额骨与颞上窗的前缘，以及肱骨与分离尺骨和桡骨的中间关节的接触。yacahuitzli副龙是迄今为止在墨西哥记录的第二个鸭嘴龙分类群，因此表明北美眼龙的多样性比之前怀疑的要大。Jair Israel barrienos - lara * [j4ir@me.com]和Jesús Alvarado-Ortega [alvarado@geologia.unam.mx]， Geología研究所，国立大学Autónoma de mmosiico，电路Investigación S/N，大学城，Delegación Coyoacán, mmosiico城，04510。
{"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}
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