Hostname: page-component-8448b6f56d-sxzjt Total loading time: 0 Render date: 2024-04-24T03:17:07.490Z Has data issue: false hasContentIssue false
  • English
  • Français

A new aglaspidid-like euarthropod from the lower Cambrian Emu Bay Shale of South Australia

Published online by Cambridge University Press:  15 January 2016

GREGORY D. EDGECOMBE ,
JOHN R. PATERSON  and
DIEGO C. GARCÍA-BELLIDO
GREGORY D. EDGECOMBE*
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
JOHN R. PATERSON
Affiliation:
Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia
DIEGO C. GARCÍA-BELLIDO
Affiliation:
School of Biological Sciences & Environment Institute, University of Adelaide, SA 5005, Australia Earth Sciences Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia
*
†Author for correspondence: g.edgecombe@nhm.ac.uk
Get access Rights & Permissions [Opens in a new window]

Abstract

A new euarthropod from the Emu Bay Shale (Cambrian Series 2, Stage 4) on Kangaroo Island, South Australia, is a rare component of this Konservat-Lagerstätte. The two known specimens of Eozetetes gemmelli gen. et sp. nov., in combination, depict a non-biomineralized euarthropod with a relatively short cephalic shield lacking dorsal eyes and bearing a flagelliform antenna, 18 trunk segments with broad tergopleurae and paired axial nodes/carinae, and an elongate, styliform tailspine. The new species compares most closely with taxa in the putative clade Vicissicaudata, which groups Aglaspidida, Cheloniellida and Xenopoda. A ring-like terminal tergite in E. gemmelli corresponds to the caudal tergite in cheloniellids and xenopodans. Incorporating Eozetetes into recent character sets for Cambrian euarthropods supports close affinities to either Emeraldella or to aglaspidids, but several plesiomorphic character states are inconsistent with membership in Aglaspidida sensu stricto. Eozetetes is among the earliest of various Cambrian taxa informally referred to as ‘aglaspidid-like euarthropods’.

Keywords

EuarthropodaEozetetes gemmelliEmeraldellaAglaspididaVicissicaudata
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 1 , January 2017 , pp. 87 - 95
Copyright
Copyright © Cambridge University Press 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Beurlen, K. 1934. Die Pygaspiden, eine neue Crustaceen−(Entomostracen−) Gruppe aus den Mesosaurier führenden Iraty−Schichten Brasiliens. Paläontologische Zeitschrift 16, 122–34.CrossRefGoogle Scholar
Broili, F. 1932. Ein neur Crustacee aus dem rheinischen Unterdevon. Sitzungsberichte der Bayerischen Akademie der Wissenschaften, mathematisch-naturwissenschaftliche Abteilung 1932, 27–38.Google Scholar
Bruton, D. L. & Whittington, H. B. 1983. Emeraldella and Leanchoilia, two arthropods from the Burgess Shale, Middle Cambrian, British Columbia. Philosophical Transactions of the Royal Society of London, B. Biological Sciences 300, 553–85.Google Scholar
Caron, J.-B., Gaines, R. R., Aria, C., Mángano, M. G. & Streng, M. 2014. A new phyllopod bed-like assemblage from the Burgess Shale of the Canadian Rockies. Nature Communications 5, 3210.CrossRefGoogle ScholarPubMed
Chlupáč, I. & Havliček, I. 1965. Kodymirus n. g., a new aglaspid merostome of the Cambrian of Bohemia. Sborník Geologických Věd, Paleontologie 6, 7–20.Google Scholar
Cotton, T. J. & Braddy, S. 2004. The phylogeny of arachnomorph arthropods and the origin of the Chelicerata. Transactions of the Royal Society of Edinburgh: Earth Sciences 94, 169–93.Google Scholar
Gehling, J. G., Jago, J. B., Paterson, J. R., García-Bellido, D. C. & Edgecombe, G. D. 2011. The geological context of the lower Cambrian (Series 2) Emu Bay Shale Lagerstätte and adjacent stratigraphic units, Kangaroo Island, South Australia. Australian Journal of Earth Sciences 58, 243–57.Google Scholar
Goloboff, P. A., Farris, J. S. & Nixon, K. C. 2008. TNT, a free program for phylogenetic analysis. Cladistics 24, 774–86.CrossRefGoogle Scholar
Hou, X. & Bergström, J. 1997. Arthropods of the Lower Cambrian Chengjiang fauna, southwest China. Fossils & Strata 45, 1–116.Google Scholar
Hou, X., Chen, J. & Lu, H. 1989. Early Cambrian new arthropods from Chengjiang, Yunnan. Acta Palaeontologica Sinica 28, 42–52.Google Scholar
Lamsdell, J. C., Stein, M. & Selden, P. A. 2013. Kodymirus and the case for convergence of raptorial appendages in Cambrian arthropods. Naturwissenschaften 100, 811–25.Google Scholar
Lankester, E. R. 1904. The structure and classification of Arthropoda. Quarterly Journal of Microscopical Science 47, 523–82.Google Scholar
Legg, D. A. 2014. Sanctacaris uncata: the oldest chelicerate (Arthropoda). Naturwissenschaften 101, 1065–73.Google Scholar
Legg, D. A., Sutton, M. D. & Edgecombe, G. D. 2013. Arthropod fossil data increase congruence of morphological and molecular phylogenies. Nature Communications 4, 2485.CrossRefGoogle ScholarPubMed
Ortega-Hernández, J., Braddy, S. J., Jago, J. B. & Baillie, P. W. 2010. A new aglaspidid arthropod from the Upper Cambrian of Tasmania. Palaeontology 53, 1065–76.Google Scholar
Ortega-Hernández, J., Legg, D. A. & Braddy, S. J. 2013. The phylogeny of aglaspidid arthropods and the internal relationships within Artiopoda. Cladistics 29, 15–45.Google Scholar
Ortega-Hernández, J., Van Roy, P. & Lerosey-Aubril, R. 2015. A new aglaspidid euarthropod with a six-segmented trunk from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco. Geological Magazine, published online 30 October 2015. doi: 10.1017/S0016756815000710.Google Scholar
Paterson, J. R., García-Bellido, D. C., Jago, J. B., Gehling, J. G., Lee, M. S. Y. & Edgecombe, G. D. 2015. The Emu Bay Shale Konservat-Lagerstätte: a view of Cambrian life from East Gondwana. Journal of the Geological Society, published online 10 November 2015. doi: 10.1144/jgs2015-083.Google Scholar
Raymond, P. E. 1935. Leanchoilia and other Mid-Cambrian Arthropoda. Bulletin of the Museum of Comparative Zoology at Harvard College 76, 205–30.Google Scholar
Stein, M., Budd, G. E., Peel, J. S. & Harper, D. A. T. 2013. Arthroaspis n. gen., a common element of the Sirius Passet Lagerstätte (Cambrian, North Greenland), sheds light on trilobite ancestry. BMC Evolutionary Biology 13, 99.CrossRefGoogle Scholar
Stein, M., Church, S. B. & Robison, R. A. 2011. A new Cambrian arthropod, Emeraldella brutoni, from Utah. Paleontological Contributions 3, 1–9.Google Scholar
Stein, M. & Selden, P. A. 2012. A restudy of the Burgess Shale (Cambrian) arthropod Emeraldella brocki and reassessment of its affinities. Journal of Systematic Palaeontology 10, 361–83.Google Scholar
Van Roy, P. 2006. An aglaspidid arthropod from the Upper Ordovician of Morocco with remarks on the affinities and limitations of Aglaspidida. Transactions of the Royal Society of Edinburgh: Earth Sciences 96, 327–50.Google Scholar
Walcott, C. D. 1911. Cambrian geology and paleontology II. Middle Cambrian Merostomata. Smithsonian Miscellaneous Collections 57, 17–40.Google Scholar
Walcott, C. D. 1912. Cambrian geology and paleontology II. Middle Cambrian Branchiopoda, Malacostraca, Trilobita and Merostomata. Smithsonian Miscellaneous Collections 57, 145–229.Google Scholar
Supplementary material: File

Edgecombe supplementary material

Edgecombe supplementary material 1

Download Edgecombe supplementary material(File)
File 17.8 KB
Supplementary material: File

Edgecombe supplementary material

Edgecombe supplementary material 2

Download Edgecombe supplementary material(File)
File 20.1 KB