Arthropod Diversity in Pokémon
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Discussion Acta Palaeontologica Polonica 63 (1): 105– 110, 2018
Discussion Acta Palaeontologica Polonica 63 (1): 105– 110, 2018 Reply to Comment on “Aysheaia prolata from the Utah Wheeler Formation (Drumian, Cambrian) is a frontal appendage of the radiodontan Stanleycaris” with the formal description of Stanleycaris STEPHEN PATES, ALLISON C. DALEY, and JAVIER ORTEGA-HERNÁNDEZ As part of a comprehensive examination of all radiodontans extend beyond the fossil margins into the rock matrix, demon- from Cambrian localities in the USA, Pates et al. (2017a, b) strating that they are not part of the fossil specimen. and Pates and Daley (2017) revised the taxonomic affinities of several described specimens. This included the reinter- Antenniform frontal appendage.—There are no features that distinguish the structure regarded by Gámez Vintaned et al. pretation of two putative lobopodians, one from the Wheeler (2011) as an antenniform limb, and the interpretation of this Formation (Utah, USA) and one from the Valdemiedes For- feature as a small burrow is more compelling as it extends into mation (Spain), as frontal appendages of the radiodontan the surrounding matrix. Structures identified as “pores” are like- genera Stanleycaris and Caryosyntrips respectively. In their ly plucked mineral grains approximately aligned in this region, comment, Gámez Vintaned and Zhuravlev (2018) disagree and other unaligned voids can be seen elsewhere in the SEM with these conclusions and raise three topics for discussion: images (Gámez Vintaned et al. 2011: fig. 12.5h, k). (i) anatomical features they suggest support a lobopodian affinity for “Mureropodia”; (ii) the identity of Caryosyntrips Proboscis with retractor-protractor muscle system.—The as a radiodontan, and the assignment of certain specimens to presence of a fleshy proboscis among lobopodians has only been this genus; and (iii) the nomenclatural status of Stanleycaris reliably documented in the Chengjiang Onychodictyon ferox (Ou hirpex as an invalid taxon. -
Aysheaia Prolata from the Utah Wheeler Formation (Drumian, Cambrian) Is a Frontal Appendage of the Radiodontan Stanleycaris
Aysheaia prolata from the Utah Wheeler Formation (Drumian, Cambrian) is a frontal appendage of the radiodontan Stanleycaris STEPHEN PATES, ALLISON C. DALEY, and JAVIER ORTEGA-HERNÁNDEZ Pates, S., Daley, A.C., and J. Ortega-Hernández, J. 2017. Aysheaia prolata from the Utah Wheeler Formation (Drumian, Cambrian) is a frontal appendage of the radiodontan Stanleycaris. Acta Palaeontologica Polonica 62 (3): 619–625. Aysheaia prolata, was described as the only lobopodian from the Drumian (Cambrian) Wheeler Formation in Utah, USA, and the sole representative of this genus besides the type species Aysheaia pedunculata, from the Cambrian (Stage 5) Stephen Formation, British Columbia. A redescription of Aysheaia prolata reveals previously overlooked morphological features, including segmental boundaries between putative lobopods, and curved terminal spines on the putative anterior end. These observations undermine lobopodian affinities of Aysheaia prolata, and instead we interpret this specimen as an isolated radiodontan frontal appendage. The presence of 11 podomeres, five of which possess elongate and anteri- orly recurved ventral blades with auxiliary spines, together with shorter robust dorsal spines, identify the specimen as Stanleycaris. This represents the first report of Stanelycaris outside of the Cambrian Stage 5 thin Stephen Formation in British Columbia, expanding its palaeobiogeographic and stratigraphic range. Aysheaia is left as a monotypic genus endemic to the Burgess Shale. The Spence Shale luolishaniid Acinocrinus stichus is currently the only lobopodian known from the Cambrian of Utah. Key words: Euarthropoda, Radiodonta, Hurdiidae, Cambrian, United States. Stephen Pates [[email protected]], Department of Zoology, University of Oxford, Oxford, OX1 3PS, UK. Allison C. Daley [[email protected]], Institute of Earth Sciences, University of Lausanne, Géopolis, CH-1015, Lausanne, Switzerland. -
Arthropod Origins
Bulletin of Geosciences, Vol. 78, No. 4, 323–334, 2003 © Czech Geological Survey, ISSN 1214-1119 Arthropod origins Jan Bergström 1 – Hou Xian-Guang 2 1 Swedish Museum of Nature History, Box 50007, S-104 05 Stockholm, Sweden. E-mail: [email protected] 2 Yunnan University, Yunnan Research Center for Chengjiang Biota, Kunming 650091, Peoples’ Republic of China. E-mail: [email protected] Abstract. Reconsideration of the position of trilobite-like arthropods leads to an idea of the last shared ancestor of known (eu)arthropods. The ancestry and morphological evolution is traced back from this form to a hypothetical ciliated and pseudosegmented slug-like ancestor. Evolution logically passed through a lobopodian stage. Extant onychophorans, Cambrian xenusians, and perhaps anomalocaridids with their kin (the Dinocaridida) may represent probable offshoots on the way. As such, these groups are highly derived and not ancestral to the arthropods. Results of molecular studies indicate a rela- tionship to moulting worms, which at first could seem to be in conflict with what was just said. However, if this is correct, the arthropod and moulting worm lineages must have diverged when some “coelomate” features such as specific vascular and neural systems were still present. The moulting worms would therefore have lost such characters, either only once or several times. Key words: arthropod origins, Anomalocaris, Tardigrada, Cambrian arthropods, Cycloneuralia, trilobitomorphs, eye ridge Introduction immediate ancestors might have looked like, and what they could not have been like. For instance, if the first arthro- Most of our important information on early arthropods co- pods were completely primitive in certain respects, they mes from such deposits as the Lower Cambrian Chengji- cannot be traced back to animals that are highly derived in ang beds, the Middle Cambrian Burgess Shale, and the Up- these respects. -
New Anomalocaridid Frontal Appendages from the Guanshan Biota, Eastern Yunnan
Article Geology November 2013 Vol.58 No.32: 39373942 doi: 10.1007/s11434-013-5908-x New anomalocaridid frontal appendages from the Guanshan biota, eastern Yunnan WANG YuanYuan1, HUANG DiYing1* & HU ShiXue2 1 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China; 2 Chengdu Institute of Geology and Mineral Resources, Chengdu 610081, China Received August 1, 2012; accepted April 15, 2013; published online June 14, 2013 Anomalocaridids were large predators of the Cambrian seas at the top of the trophic pyramid. Complete anomalocaridid speci- mens have been rarely discovered and the rigid isolated frontal appendages and mouthparts are more commonly preserved. Here we study new material of the frontal appendages from the Wulongqing Formation, Cambrian Stage 4, Series 2 near Kunming, eastern Yunnan. Two new forms of anomalocaridid frontal appendages are described, namely Anomalocaris kunmingensis sp. nov. and Paranomalocaris multisegmentalis gen. nov., sp. nov. The frontal appendage of A. kunmingensis sp. nov. probably comprises 15 podomeres of which the first one has a weakened skeletoned, the second one is armed with small spines, and the third one is armed with remarkably robust proximal ventral spines with 6 anisomerous auxiliary spines; paired auxiliary spines are associated with podomeres 4–14; podomeres 12–14 are armed with paired dorsal spines, and the last podomere bears 2 distal spines, one spine distinctly larger than the other. The frontal appendage of P. multisegmentalis tapered backwards, consisting of 22 visible podomeres; the most ventral spine is armed with 5 pairs of auxiliary spines, and podomeres 12–21 bear dorsal spines, the last podomere with 2 small distal spines. -
The Endemic Radiodonts of the Cambrian Stage 4 Guanshan Biota of South China
Editors' choice The endemic radiodonts of the Cambrian Stage 4 Guanshan Biota of South China DE-GUANG JIAO, STEPHEN PATES, RUDY LEROSEY-AUBRIL, JAVIER ORTEGA-HERNÁNDEZ, JIE YANG, TIAN LAN, and XI-GUANG ZHANG Jiao, D.-G., Pates, S., Lerosey-Aubril, R., Ortega-Hernández, J., Yang, J., Lan, T., and Zhang, X.-G. 2021. The endemic radiodionts of the Cambrian Stage 4 Guanshan Biota of South China. Acta Palaeontologica Polonica 66 (2): 255–274. The Guanshan Biota (South China, Cambrian, Stage 4) contains a diverse assemblage of biomineralizing and non-biomin- eralizing animals. Sitting temporally between the Stage 3 Chengjiang and Wuliuan Kaili Biotas, the Guanshan Biota con- tains numerous fossil organisms that are exclusive to this exceptional deposit. The Guanshan Konservat-Lagerstätte is also unusual amongst Cambrian strata that preserve non-biomineralized material, as it was deposited in a relatively shallow water setting. In this contribution we double the diversity of radiodonts known from the Guanshan Biota from two to four, and describe the second species of Paranomalocaris. In addition, we report the first tamisiocaridid from South China, and confirm the presence of a tetraradial oral cone bearing small and large plates in “Anomalocaris” kunmingensis, the most abundant radiodont from the deposit. All four radiodont species, and three genera, are apparently endemic to the Guanshan Biota. When considered in the wider context of geographically and temporally comparable radiodont faunas, endemism in Guanshan radiodonts is most likely a consequence of the shallower and more proximal environment in which they lived. The strong coupling of free-swimming radiodonts and benthic communities underlines the complex relationship between the palaeobiogeographic and environmental distributions of prey and predators. -
Arthropod Fossil Data Increase Congruence of Morphological and Molecular Phylogenies
ARTICLE Received 14 Jan 2013 | Accepted 21 Aug 2013 | Published 30 Sep 2013 DOI: 10.1038/ncomms3485 Arthropod fossil data increase congruence of morphological and molecular phylogenies David A. Legg1,2,3, Mark D. Sutton1 & Gregory D. Edgecombe2 The relationships of major arthropod clades have long been contentious, but refinements in molecular phylogenetics underpin an emerging consensus. Nevertheless, molecular phylogenies have recovered topologies that morphological phylogenies have not, including the placement of hexapods within a paraphyletic Crustacea, and an alliance between myriapods and chelicerates. Here we show enhanced congruence between molecular and morphological phylogenies based on 753 morphological characters for 309 fossil and Recent panarthropods. We resolve hexapods within Crustacea, with remipedes as their closest extant relatives, and show that the traditionally close relationship between myriapods and hexapods is an artefact of convergent character acquisition during terrestrialisation. The inclusion of fossil morphology mitigates long-branch artefacts as exemplified by pycnogonids: when fossils are included, they resolve with euchelicerates rather than as a sister taxon to all other euarthropods. 1 Department of Earth Sciences and Engineering, Royal School of Mines, Imperial College London, London SW7 2AZ, UK. 2 Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK. 3 Oxford University Museum of Natural History, Oxford OX1 3PW, UK. Correspondence and requests for materials should be addressed to D.A.L. (email: [email protected]). NATURE COMMUNICATIONS | 4:2485 | DOI: 10.1038/ncomms3485 | www.nature.com/naturecommunications 1 & 2013 Macmillan Publishers Limited. All rights reserved. ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/ncomms3485 rthropods are diverse, disparate, abundant and ubiqui- including all major extinct and extant panarthropod groups. -
A New Radiodont (Stem Euarthropoda) Frontal Appendage with a Mosaic of Characters from the Cambrian (Series 2 Stage 3) Chengjiang Biota
A new radiodont (stem Euarthropoda) frontal appendage with a mosaic of characters from the Cambrian (Series 2 Stage 3) Chengjiang biota Jin Guo1, Stephen Pates2, 3*, Peiyun Cong4, 5, 6*, Allison C. Daley 3, Gregory D. Edgecombe5, 6, Taimin Chen1 and Xianguang Hou4, 6 1 Management Committee of the Chengjiang Fossil Site World Heritage, Chengjiang 652599, China; email: [email protected], [email protected] 2 Department of Zoology, University of Oxford, Oxford OX1 3PS, UK; email: [email protected] 3 Institute of Earth Sciences, University of Lausanne, Lausanne CH-1015, Switzerland; email: [email protected] 4 Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China; email: [email protected], [email protected] 5 Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK; email: [email protected], [email protected] 6 MEC International Joint Laboratory for Palaeobiology and Palaeoenvironment, Yunnan University, Kunming 650091 China. * Corresponding author Abstract: The classification of Radiodonta is primarily based on the morphology of their frontal appendages, a main feeding structure of this iconic group of mostly Cambrian stem-group euarthropods. However, recent progress in the description and revision of radiodont taxa, particularly drawing on their frontal appendages, has exposed morphological variation that challenges reliable identification of higher- level groupings. Here we describe a new taxon of Radiodonta, Laminacaris chimera gen. et sp. nov., from the Cambrian Series 2, Stage 3, Chengjiang biota of China, based on unique frontal appendage morphology. Laminacaris is distinctive for its combination of characters shared by hurdiids and other early Cambrian radiodont families. -
An Armoured Cambrian Lobopodian from China with Arthropod-Like Appendages
LETTER doi:10.1038/nature09704 An armoured Cambrian lobopodian from China with arthropod-like appendages Jianni Liu1,2, Michael Steiner2, Jason A. Dunlop3, Helmut Keupp2, Degan Shu1,4, Qiang Ou4, Jian Han1, Zhifei Zhang1 & Xingliang Zhang1 Cambrian fossil Lagersta¨tten preserving soft-bodied organisms expanded compared to the trunk and shows no sign of becoming have contributed much towards our understanding of metazoan thinner towards the end. No mouth can be observed (Figs 2a–e and origins1–3. Lobopodians are a particularly interesting group that 3). A small projection occurs at the posterior end of the body (Figs 2a–c diversified and flourished in the Cambrian seas. Resembling and 3). The main body trunk is sub-circular in outline and composed ‘worms with legs’, they have long attracted much attention in that of nine segments, each comprising five rows of sub-parallel transverse they may have given rise to both Onychophora (velvet worms)4–6 annulations alternating with five rings of tubercles with tiny spines and Tardigrada (water bears)7,8,aswellastoarthropodsingeneral9–12. (Fig. 1a, b); each with 10–12 tubercles. The tiny spines are not well- Here we describe Diania cactiformis gen. et sp. nov. as an ‘armoured’ preserved, possibly as an artefact of taphonomy, and in most cases only lobopodian from the Chengjiang fossil Lagersta¨tte (Cambrian Stage the tubercles of these spines are observable (Figs 1a, b and 2b–c). 3), Yunnan, southwestern China. Although sharing features with A pair of strongly armoured appendages protrudes from the ven- other typical lobopodians, it is remarkable for possessing robust trolateral region of each segment, each limb attached robustly at its and probably sclerotized appendages, with what appear to be articu- base to the otherwise slender trunk. -
The Palaeontology Newsletter
The Palaeontology Newsletter Contents100 Editorial 2 Association Business 3 Annual Meeting 2019 3 Awards and Prizes AGM 2018 12 PalAss YouTube Ambassador sought 24 Association Meetings 25 News 30 From our correspondents A Palaeontologist Abroad 40 Behind the Scenes: Yorkshire Museum 44 She married a dinosaur 47 Spotlight on Diversity 52 Future meetings of other bodies 55 Meeting Reports 62 Obituary: Ralph E. Chapman 67 Grant Reports 72 Book Reviews 104 Palaeontology vol. 62 parts 1 & 2 108–109 Papers in Palaeontology vol. 5 part 1 110 Reminder: The deadline for copy for Issue no. 101 is 3rd June 2019. On the Web: <http://www.palass.org/> ISSN: 0954-9900 Newsletter 100 2 Editorial This 100th issue continues to put the “new” in Newsletter. Jo Hellawell writes about our new President Charles Wellman, and new Publicity Officer Susannah Lydon gives us her first news column. New award winners are announced, including the first ever PalAss Exceptional Lecturer (Stephan Lautenschlager). (Get your bids for Stephan’s services in now; check out pages 34 and 107.) There are also adverts – courtesy of Lucy McCobb – looking for the face of the Association’s new YouTube channel as well as a call for postgraduate volunteers to join the Association’s outreach efforts. But of course palaeontology would not be the same without the old. Behind the Scenes at the Museum returns with Sarah King’s piece on The Yorkshire Museum (York, UK). Norman MacLeod provides a comprehensive obituary of Ralph Chapman, and this issue’s palaeontologists abroad (Rebecca Bennion, Nicolás Campione and Paige dePolo) give their accounts of life in Belgium, Australia and the UK, respectively. -
Evolutionary Patterns of Host Plant Use by Delphacid Planthoppers
population dynamics. Plant de specificity are considered with 1 crop varieties resistant to del- plant architecture on the abun n Chapter 3 (Denno). Species Evolutionary Patterns of Host Plant ' geographic and plant patch Use by Delphacid Planthoppers and density and plant diversity on l. The causal mechanisms for Their Relatives 1 and persistence are discussed its such as dispersal ability and ization and persistence. Stephen W. Wilson, Charles Mitter, Robert F. Denno and Michael R. Wilson Introduction Planthoppers (Homoptera: Fulgoroidea) are found on every continent ex cept Antarctica and in all major biomes, including tropical rainforests, deserts, grasslands, and the arctic tundra (O'Brien and Wilson 1985). The more than 9000 described species are divided into 19 families (O'Brien and Wilson 1985; Wheeler and Wilson 1987). All species of Fulgoroidea are phytophagous, sucking fluids from leaves, stems, roots, or fungal hyphae. There are species which feed on woody plants (both angiosperms and gymnosperms), herbs, ferns, and even fungi (O'Brien and Wilson 1985). The largest and most studied family of planthoppers is the Delphacidae which includes more than 2000 species in approximately 300 genera and 6 subfamilies (Asche 1985, 1990). Most continental delphacids are associated with monocots, particularly grasses and sedges (Wilson and O'Brien 1987; Denno and Roderick 1990 ), whereas some species, especially those on oceanic archipelagos, have radiated on dicots as well (Giffard 1922; Zim merman 1948). Their predilection for monocots, phloem-feeding habit, oviposition behavior and ability to transmit pathogens have contributed to the severe pest status of several delphacid species on rice, corn, sugarcane, and several cereal crops (Wilson and O'Brien 1987). -
Smadel-Gajdusek Correspondence, 1955-1958
Correspondence on the Discovery and Original Investigations on Kuru Smodel — Gajdusek Correspondence 1955-1958 / l(V*-f Correspondence on the Discovery and Original Investigations on Kuru Smadel-Gajdusek Correspondence, 1955-1958 Edited by D.C. Gajdusek Study of Child Growth and Development and Disease Patterns in Primitive Cultures National Institute of Neurological and Communicative Disorders and Stroke National Institutes of Health Bethesda, Maryland April, 1975 k PREFACE These letters speak for themselves. They document the discovery and the origins and pursuance of the first year of study of kuru in great detail and should serve to dispel any misconceptions about who did what and answer many hows, whens, and whys about the early field work and laboratory investigations on kuru. Sufficient time has elapsed since Dr. Vincent Zigas and I published our first account of kuru to transcribe this correspondence without any deletions. Only minor errors of spelling, grammar and punctuation have been corrected. Errors in observation, interpretation, and judgement stand as they were committed in writing. I trust that the edification they may achieve will pardon any lack of discretion in presenting them. D. Carleton Gajdusek, M.D. -1- r L ACKNOl'JLEDGEMENT Above all else, the publication of these letters is a tribute to the late Dr. Joseph E. Smadel who had so much to do with the first year of our kuru investigation and who provided me with the base laboratory at the National Institutes of Health in which we later were able to demonstrate the slow virus etiology of kuru, the first proved slow virus infection of man. -
LETTER Doi:10.1038/Nature09920
LETTER doi:10.1038/nature09920 A giant Ordovician anomalocaridid Peter Van Roy1,2 & Derek E. G. Briggs1,3 Anomalocaridids, giant lightly sclerotized invertebrate predators, appendage20. Its morphology, however, differs from an anomalocaridid occur in a number of exceptionally preserved early and middle spine20, and its unsegmented, sclerotized nature is inconsistent with an Cambrian (542–501 million years ago) biotas and have come to anterior appendage22. Schinderhannes bartelsi from the Lower symbolize the unfamiliar morphologies displayed by stem organisms Devonian Hunsru¨ck Slate retains some anomalocaridid characters, in faunas of the Burgess Shale type. They are characterized by a pair of including a circular mouth and anterior raptorial appendages, but anterior, segmented appendages, a circlet of plates around the mouth, clearly lies crownward as a sister taxon to the euarthropods5. and an elongate segmented trunk lacking true tergites with a pair of The Fezouata Biota preserves a fully marine Burgess Shale fauna in flexible lateral lobes per segment1,2.Disarticulatedbodyparts,suchas combination with more advanced taxa8,23. The anomalocaridid speci- the anterior appendages and oral circlet, had been assigned to a range mens are associated with a diverse fauna8 and were recovered from five of taxonomic groups—but the discovery of complete specimens from excavations north of Zagora, in southeastern Morocco. Excavations 1 the middle Cambrian Burgess Shale showed that these disparate and 2 are approximately coeval, and sit just below the boundary elements all belong to a single kind of animal3. Phylogenetic analyses between the Lower and Upper Fezouata Formations; they are latest support a position of anomalocaridids in the arthropod stem, as a Tremadocian in age.