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Morphology ofAnomalocaris canadensis from the Burgess Shale

Published online by Cambridge University Press: 14 July 2015

Allison C. Daley
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK, ;School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK
Gregory D. Edgecombe
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK, ;

Abstract

Recent description of the oral cone ofAnomalocaris canadensis from the Burgess Shale (Cambrian Series 3, Stage 5) highlighted significant differences from published accounts of this iconic species, and prompts a new evaluation of its morphology as a whole. All known specimens ofA. canadensis, including previously unpublished material, were examined with the aim of providing a cohesive morphological description of this stem lineage arthropod. In contrast to previous descriptions, the dorsal surface of the head is shown to be covered by a small, oval carapace in close association with paired stalked eyes, and the ventral surface bears only the triradial oral cone, with no evidence of a hypostome or an anterior sclerite. The frontal appendages reveal new details of the arthrodial membranes and a narrower cross-section in dorsal view than previously reconstructed. The posterior body region reveals a complex suite of digestive, respiratory, and locomotory characters that include a differentiated foregut and hindgut, a midgut with paired glands, gill-like setal blades, and evidence of muscle bundles and struts that presumably supported the swimming movement of the body flaps. The tail fan includes a central blade in addition to the previously described three pairs of lateral blades. Some of these structures have not been identified in other anomalocaridids, makingAnomalocaris critical for understanding the functional morphology of the group as a whole and corroborating its arthropod affinities.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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References

Bengtson,S.2000.Teasing fossils out of shales with cameras and computers.Palaeontologia Electronica,3:1–14.Google Scholar
Bergström,J.1986.Opabinia andAnomalocaris, Unique Cambrian Arthropods.Lethaia,19:241–246.CrossRefGoogle Scholar
Bergström,J.1987.The CambrianOpabinia andAnomalocaris.Lethaia,20:187–188.CrossRefGoogle Scholar
Briggs,D. E. G.1979.Anomalocaris, the largest known Cambrian arthropod.Palaeontology,22:631–663.Google Scholar
Briggs,D. E. G. andMount,J. D.1982.The occurrence of the giant arthropodAnomalocaris in the Lower Cambrian of Southern California, and the overall distribution of the genus.Journal of Paleontology,56:1,112–1,118.Google Scholar
Briggs,D. E. G. andNedin,C.1997.The taphonomy and affinities of the problematic fossilMyoscolex from the lower Cambrian Emu Bay Shale of South Australia.Journal of Paleontology,71:22–32.Google Scholar
Briggs,D. E. G. andRobison,R. A.1984.Exceptionally preserved nontrilobite arthropods andAnomalocaris from the middle Cambrian of Utah.University of Kansas Paleontological Contributions,111:1–23.Google Scholar
Briggs,D. E. G.,Erwin,D. H., andCollier,F. J.1994.The Fossils of the Burgess Shale.Smithsonian Books,Washington,238p.Google Scholar
Briggs,D. E. G.,Lieberman,B. S.,Hendricks,J. R.,Halgedahl,S. L., andJarrard,R. D.2008.Middle Cambrian arthropods from Utah.Journal of Paleontology,82:238–254.CrossRefGoogle Scholar
Budd,G. E.1998.Arthropod body-plan evolution in the Cambrian with an example from anomalocaridid muscle.Lethaia,31:197–210.Google Scholar
Budd,G. E.2008.Head structure in upper stem-group euarthropods.Palaeontology,51:561–573.CrossRefGoogle Scholar
Butterfield,N. J.1990.Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale.Paleobiology,16:272–286.Google Scholar
Butterfield,N. J.2002.Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale-type fossils.Paleobiology,28:155–171.Google Scholar
Caron,J.-B.,Gaines,R. R.,Mángano,M. G.,Streng,M., andDaley,A. C.2010.A new Burgess Shale-type assemblage from the “thin” Stephen Formation of the southern Canadian Rockies.Geology,38:811–814.Google Scholar
Chen,J.,Ramsköld,L., andZhou,G. Q.1994.Evidence for monophyly and arthropod affinity of Cambrian giant predators.Science,264:1304–1308.Google Scholar
Collins,D.1996.The “evolution” ofAnomalocaris and its classification in the arthropod class Dinocarida (nov) and order Radiodonta (nov).Journal of Paleontology,70:280–293.Google Scholar
Daley,A. C. andBergström,J.2012.The oral cone ofAnomalocaris is not a classic “peytoia.”Naturwissenschaften,99:501–504.Google Scholar
Daley,A. C. andBudd,G. E.2010.New anomalocaridid appendages from the Burgess Shale, Canada.Palaeontology,53:721–738.Google Scholar
Daley,A. C.,Budd,G. E.,Caron,J.-B.,Edgecombe,G. D., andCollins,D.2009.The Burgess Shale anomalocarididHurdia and its significance for early euarthropod evolution.Science,323:1,597–1,600.Google Scholar
Daley,A. C.,Budd,G. E., andCaron,J.-B.2013a.The morphology and systematics of the anomalocarididHurdia from the middle Cambrian of British Columbia and Utah.Journal of Systematic Palaeontology,11.Google Scholar
Daley,A. C.,Paterson,J. R.,Edgecombe,G. D.,García-Bellido,D. C., andJago,J. B.2013b.New anatomical information onAnomalocaris from the Cambrian Emu Bay Shale of South Australia and a reassessment of it inferred predatory habits.Palaeontology,56:971–990.Google Scholar
Edgecombe,G. D.2009.Palaeontological and molecular evidence linking arthropods, onychophorans and other Ecdysozoa.Evolution: Education and Outreach,2:178–190.Google Scholar
Fletcher,T. P. andCollins,D. H.1998.The middle Cambrian Burgess Shale and its relationship to the Stephen Formation in the southern Canadian Rocky Mountains.Canadian Journal of Earth Sciences,35:413–436.Google Scholar
Haug,J. T,Waloszek,D.,Maas,A.,Liu,Y., andHaug,C.2012.Functional morphology, ontogeny and evolution of mantis shrimp-like predators in the Cambrian.Palaeontology,55:369–399.Google Scholar
Henriksen,K. L.1928.Critical notes upon some Cambrian arthropods described by Charles D. Walcott.Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening,86:1–20.Google Scholar
Hou,X. andBergström,J.2006.Dinocarids—anomalous arthropods or arthropod-like worms,p. 139–158,847–850.InRong,J.,Fang,Z.,Zhou,Z.,Zhan,R.,Wang,X., andYuan,X.(eds.),Originations, Radiations and Biodiversity Changes–Evidences From The Chinese Fossil Record.Science Press,Beijing.Google Scholar
Hou,X.,Bergström,J., andAhlberg,P.1995.Anomalocaris and other large animals in the lower Cambrian Chengjiang Fauna of southwest China.GFF,117:163–183.Google Scholar
Legg,D.2013.Multi-segmented arthropods from the middle Cambrian of British Columbia (Canada).Journal of Paleontology,87:493–501.CrossRefGoogle Scholar
Legg,D. A.,Sutton,M. D.,Edgecombe,G. D., andCaron,J.-B.2012.Cambrian bivalved arthropod reveals origin of arthrodisation.Proceedings of the Royal Society, Series B (Biological Sciences),279:4699–4704.Google Scholar
O'Brien,L. andCaron,J.-B.2012.A new stalked filter-feeder from the middle Cambrian Burgess Shale, British Columbia, Canada.PLoS ONE,7:1–21.Google Scholar
Paterson,J. R.,García-Bellido,D. C.,Lee,M. S. Y.,Brock,G. A.,Jago,J. B., andEdgecombe,G. D.2011.Acute vision in the giant Cambrian predatorAnomalocaris and the origin of compound eyes.Nature,480:237–240.Google Scholar
Raymond,P. E.1935.Leanchoilia and other mid-Cambrian Arthropoda.Bulletin of the Museum of Comparative Zoology, Harvard University,76:205–230.Google Scholar
Resser,C. E.1929.New lower and middle Cambrian Crustacea.Proceedings of the United States National Museum,76:1–18.Google Scholar
Rolfe,W. D. I.1969.Phyllocarida,p.269–331.InMoore,R. C.(ed.),Treatise on Invertebrate Paleontology, Part R.Geological Society of America and University of Kansas Press.Google Scholar
Rudkin,D. M.2009.The Mount Stephen Trilobite Beds,p.91–102.InCaron,J.-B. andRudkin,D. M.(eds.),A Burgess Shale Primer—History, Geology and Research Highlights.The Burgess Shale Consortium,Toronto.Google Scholar
Schönemann,B. andClarkson,E. N. K.2012.Functional analysis of lower Cambrian eye system.Palaeontographica A,297:123–149.Google Scholar
Siebold,C.Von,Th.1848.Lehrbuch det vergleichenden Anatomie der Wirbellosen Thiere.Veit and Comp.,Berlin,679p.Google Scholar
Simonetta,A. M. andDelle Cave,L.1975.The Cambrian non trilobite arthropods from the Burgess Shale of British Columbia. A study of their comparative morphology, taxonomy and evolutionary significance.Palaeontographia Italica,69:1–37.Google Scholar
Stein,M.2010.A new arthropod from the early Cambrian of North Greenland, with a ‘great appendage'-like antennula.Zoological Journal of the Linnean Society,158:477–500.Google Scholar
Suzuki,Y. andBergström,J.2008.Respiration in trilobites: a reevaluation.GFF,130:211–229.Google Scholar
Vannier,J.2009.L'explosion cambrienne ou l'émergence des ecosystèmes modernes.Comptes Rendus Palevol,8:133–154.Google Scholar
Vannier,J. andChen,J.2005.Early Cambrian food chain: new evidence from fossil aggregates in the Maotianshan Shale Biota, SW China.Palaios,20:3–26.CrossRefGoogle Scholar
Van Roy,P. andBriggs,D. E. G.2011.A giant Ordovician anomalocaridid.Nature,473:510–513.Google Scholar
Walcott,C. D.1908.Mount Stephen rocks and fossils.Canadian Alpine Journal,1:232–248.Google Scholar
Walcott,C. D.1911.Cambrian geology and paleontology. II. Middle Cambrian holothurians and medusae.Smithsonian Miscellaneous Collections,57:41–68.Google Scholar
Walcott,C. D.1912.Middle Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata.Smithsonian Miscellaneous Collections,57:145–228.Google Scholar
Whiteaves,J. F.1892.Description of a new genus and species of Phyllocarid Crustacea from the middle Cambrian of Mount Stephen, B.C.Canadian Record of Science,5:205–208.Google Scholar
Whittington,H. B. andBriggs,D. E. G.1982.A new conundrum from the middle Cambrian Burgess Shale.Proceedings of the Third North American Paleontological Convention, Montreal,2:573–575.Google Scholar
Whittington,H. B. andBriggs,D. E. G.1985.The largest Cambrian animal,Anomalocaris, Burgess Shale, British Columbia.Philosophical Transactions of the Royal Society of London Series B-Biological Sciences,309:569–609.Google Scholar
Woodward,H.1902.The Canadian Rockies—Part 1. On a collection of Middle Cambrian fossils obtained by Edward Whymper, Esq., F.R.G.S., from Mount Stephen, British Columbia.Geological Magazine,9:502–505,529–544.Google Scholar