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New artiopodan arthropods from the early Cambrian Emu Bay Shale Konservat-Lagerstätte of South Australia

  • John R. Paterson (a1), Diego C. García-Bellido (a2) and Gregory D. Edgecombe (a3)
Abstract

The Emu Bay Shale Konservat-Lagerstätte (Cambrian Series 2, Stage 4) on Kangaroo Island, South Australia, is the source of two new non-biomineralized artiopodan arthropods. Squamacula buckorum n. sp. is the first record outside of China of a genus otherwise known only from its type species, S. clypeata, from the Chengjiang biota. The Australian species displays the long cephalic doublure and spiniform exopod setae that are apomorphic for this genus, provides new information on the alimentary tract and midgut glands (the latter preserved as three-dimensional, permineralized structures), and indicates interspecific variability in trunk segment numbers. The distribution of Squamacula strengthens the biogeographic connections between early Cambrian “Burgess Shale-type” biotas of Australia and South China. Australimicola spriggi n. gen. n. sp. represents a monotypic genus resolved in a cladistic analysis of Cambro-Ordovician artiopodans as most closely related to or within Conciliterga (a clade containing Helmetia, Kuamaia, Kwanyinaspis, Rhombicalvaria, Saperion, Skioldia, and Tegopelte). Compared with other members of this clade from Chengjiang and the Burgess Shale, the new genus is diagnosed by an elongate trunk with 23 thoracic tergites having spatulate pleural tips and a small pygidium possessing a single, elongate pair of pleural spines, with specimens also showing a hypostome attached to an anterior (or prehypostomal) sclerite, antennae, short endopods, an annulated alimentary tract, and a series of three-dimensional, permineralized midgut glands. An alternative relationship between Australimicola and the Early Ordovician–Early Devonian Cheloniellida explains the shared anterior flexure of trunk pleurae but forces dubious homologies in other characters, such as dorsally-articulated furcae versus spines.

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K. Bremer 1994. Branch support and tree stability. Cladistics, 10:295304.

D. L. Bruton 1981. The arthropod Sidneyia inexpectans, Middle Cambrian, Burgess Shale, British Columbia. Philosophical Transactions of the Royal Society, London, B, 295:619653.

G. E. Budd 1998. Stem group arthropods from the Lower Cambrian Sirius Passet fauna of North Greenland, p. 125138. In R. A. Fortey and R. H. Thomas (eds.), Arthropod Relationships. The Systematics Association Special Volume, Series 55, Chapman and Hall, London.

G. E. Budd 2011. Campanamuta mantonae gen. et sp. nov., an exceptionally preserved arthropod from the Sirius Passet Fauna (Buen Formation, lower Cambrian, North Greenland). Journal of Systematic Palaeontology, 9:217260.

G. E. Budd and A. C. Daley 2012. The lobes and lobopods of Opabinia regalis from the middle Cambrian Burgess Shale. Lethaia, 45:8395.

N. J. Butterfield 2002. Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale-type fossils. Paleobiology, 28:155171.

N. J. Butterfield 2003. Exceptional fossil preservation and the Cambrian explosion. Integrative and Comparative Biology, 43:166177.

J-B. Caron and D. A. Jackson 2008. Paleoecology of the Greater Phyllopod Bed community, Burgess Shale. Palaeogeography, Palaeoclimatology, Palaeoecology, 258:222256.

S. Conway Morris , J. S. Peel , A. K. Higgins , N. J. Soper , and N. C. Davis 1987. A Burgess Shale-like fauna from the Lower Cambrian of North Greenland. Nature, 326:181183.

S. Q. Dornbos and J-Y. Chen 2008. Community palaeoecology of the early Cambrian Maotianshan Shale biota: Ecological dominance of priapulid worms. Palaeogeography, Palaeoclimatology, Palaeoecology, 258:200212.

J. A. Dunlop and P. A. Selden 1998. The early history and phylogeny of the chelicerates, p. 221235. In R. A. Fortey and R. H. Thomas (eds.), Arthropod Relationships. The Systematics Association Special Volume, Series 55, Chapman and Hall, London.

G. D. Edgecombe , D. C. García-Bellido , and J. R. Paterson 2011. A new leanchoiliid megacheiran arthropod from the lower Cambrian Emu Bay Shale, South Australia. Acta Palaeontologica Polonica, 56:385400.

J. S. Farris , V. A. Albert , M. Källersjö , D. Lipscomb , and A. G. Kluge 1996. Parsimony jackknifing outperforms neighbor-joining. Cladistics, 12:99124.

D. C. García-Bellido and D. Collins 2007. Reassessment of the genus Leanchoilia (Arthropoda, Arachnomorpha) from the middle Cambrian Burgess Shale, British Columbia, Canada. Palaeontology, 50:693709.

D. C. García-Bellido , J. Vannier , and D. Collins 2009a. Soft-part preservation in two species of the arthropod Isoxys from the middle Cambrian Burgess Shale of British Columbia, Canada. Acta Palaeontologica Polonica, 54:699712.

D. C. García-Bellido , J. R. Paterson , G. D. Edgecombe , J. B. Jago , J. G. Gehling , and M. S. Y. Lee 2009b. The bivalved arthropods Isoxys and Tuzoia with soft-part preservation from the lower Cambrian Emu Bay Shale Lagerstätte (Kangaroo Island, Australia). Palaeontology, 52:12211241.

J. G. Gehling , J. B. Jago , J. R. Paterson , D. C. García-Bellido , and G. D. Edgecombe 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, 58:243257.

P. A. Goloboff 1993. Estimating character weights during tree search. Cladistics, 9:8391.

P. A. Goloboff , J. S. Farris , and K. C. Nixon 2008a. TNT, a free program for phylogenetic analysis. Cladistics, 24:774786.

P. A. Goloboff , J. M. Carpenter , J. S. Arias , and D. F. M. Esquivel 2008b. Weighting against homoplasy improves phylogenetic analysis of morphological datasets. Cladistics, 24:116.

S-X. Hu , M-Y. Zhu , M. Steiner , H-L. Luo , F-C. Zhao , and Q. Liu 2010. Biodiversity and taphonomy of the early Cambrian Guanshan biota, eastern Yunnan. Science China Earth Sciences, 53:17651773.

A. Yu. Ivantsov , A. Yu. Zhuravlev , A. V. Leguta , V. A. Krassilov , L. M. Melnikova , and G. T. Ushatinskaya 2005. Palaeoecology of the early Cambrian Sinsk biota from the Siberian Platform. Palaeogeography, Palaeoclimatology, Palaeoecology, 220:6988.

J. B. Jago and B. J. Cooper 2011. The Emu Bay Shale Lagerstätte: A history of investigations. Australian Journal of Earth Sciences, 58:235241.

M. S. Y. Lee , J. B. Jago , D. C. García-Bellido , G. D. Edgecombe , J. G. Gehling , and J. R. Paterson 2011. Modern optics in exceptionally preserved eyes of early Cambrian arthropods from Australia. Nature, 474:631634.

J. Lin , A. Y. Ivantsov , and D. E. G. Briggs 2011. The cuticle of the enigmatic arthropod Phytophilaspis and biomineralization in Cambrian arthropods. Lethaia, 44:344349.

A. Maas , A. Braun , X-P. Dong , P. C. J. Donoghue , K. J. Müller , E. Olempska , J. E. Repetski , D. J. Siveter , M. Stein , and D. Waloszek 2006. The ‘Orsten’—More than a Cambrian Konservat-Lagerstätte yielding exceptional preservation. Palaeoworld, 15:266282.

D. M. McKirdy , P. A. Hall , C. Nedin , G. P. Halverson , B. H. Michaelsen , J. B. Jago , J. G. Gehling , and R. J. F. Jenkins 2011. Paleoredox status and thermal alteration of the Lower Cambrian (Series 2) Emu Bay Shale Lagerstätte, South Australia. Australian Journal of Earth Sciences, 58:259272.

J. R. Paterson and G. A. Brock 2007. Early Cambrian trilobites from Angorichina, Flinders Ranges, South Australia, with a new assemblage from the Pararaia bunyerooensis Zone. Journal of Paleontology, 81:116142.

J. R. Paterson , G. D. Edgecombe , D. C. García-Bellido , J. B. Jago , and J. G. Gehling 2010. Nektaspid arthropods from the lower Cambrian Emu Bay Shale Lagerstätte, South Australia, with a reassessment of lamellipedian relationships. Palaeontology, 53:377402.

J. R. Paterson , D. C. García-Bellido , M. S. Y. Lee , G. A. Brock , J. B. Jago , and G. D. Edgecombe 2011. Acute vision in the giant Cambrian predator Anomalocaris and the origin of compound eyes. Nature, 480:237240.

J. Peng , Y. Zhao , Y. Wu , J. Yuan , and T. Tai 2005. The Balang Fauna—A new early Cambrian fauna from Kaili City, Guizhou Province. Chinese Science Bulletin, 50:14.

L. Ramsköld , J. Chen , G. D. Edgecombe , and G. Zhou 1996. Preservational folds simulating tergite junctions in tegopeltid and naraoiid arthropods. Lethaia, 29:1520.

M. Stein 2010. A new arthropod from the early Cambrian of North Greenland, with a ‘great appendage’-like antennula. Zoological Journal of the Linnean Society, 158:477500.

M. Stein and P. A. Selden 2012. A restudy of the Burgess Shale (Cambrian) arthropod Emeraldella brocki and reassessment of its affinities. Journal of Systematic Palaeontology, in press.

W. Stürmer and J. Bergström 1978. The arthropod Cheloniellon from the Devonian Hunsrück Shale. Paläontologische Zeitschrift, 52:5781.

T. P. Topper , C. B. Skovsted , G. A. Brock , and J. R. Paterson 2011. The oldest bivalved arthropods from the early Cambrian of East Gondwana: Systematics, biostratigraphy and biogeography. Gondwana Research, 19:310326.

X. Zhang and D. Shu 2005. A new arthropod from the Chengjiang Lagerstätte, early Cambrian, southern China. Alcheringa, 29:185194.

X. Zhang , J. Han , and D. Shu 2000. A new arthropod Pygmaclypeatus daziensis from the early Cambrian Chengjiang Lagerstätte, South China. Journal of Paleontology, 74:979983.

X. Zhang , J. Han , Z. Zhang , H. Liu , and D. Shu 2004. Redescription of the Chengjiang arthropod Squamacula clypeata Hou and Bergström, from the Lower Cambrian, south-west China. Palaeontology, 47:605617.

F. Zhao , M. Zhu , and S. Hu 2010. Community structure and composition of the Cambrian Chengjiang biota. Science China Earth Sciences, 53:17841799.

F. Zhao , J-B. Caron , S. Hu , and M. Zhu 2009. Quantitative analysis of taphofacies and paleocommunities in the early Cambrian Chengjiang Lagerstätte. Palaios, 24:826839.

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Journal of Paleontology
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