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Multi-Segmented Arthropods from the Middle Cambrian of British Columbia (Canada)

  • David Legg (a1)
Abstract

A new arthropod, Kootenichela deppi n. gen. n. sp., is described from the Stanley Glacier exposure of the middle Cambrian (Series 3, Stage 5) Stephen Formation in Kootenay National Park (British Columbia, Canada). This taxon possesses a number of primitive arthropod features such as an elongate, homonomous trunk (consisting of at least 29 segments), poorly sclerotised trunk appendages, and large pedunculate eyes associated with an anterior (ocular) sclerite. The cephalon encompasses a possible antenna-like appendage and enlarged raptorial appendages with a bipartite peduncle and three spinose distal podomeres, indicative of megacheiran (“great-appendage” arthropod) affinities. The relationships of megacheirans are controversial, with them generally considered as either stem-euarthropods or a paraphyletic stem-lineage of chelicerates. An extensive cladistic analysis resolved Kootenichela as sister-taxon to the enigmatic Worthenella cambria from the middle Cambrian (Series 3, Stage 5), Burgess Shale Formation in Yoho National Park (British Columbia), which is herein reinterpreted as a megacheiran arthropod. Based on their sister-group relationship, both taxa were placed in the new family Kootenichelidae, to which Pseudoiulia from the Chengjiang biota is also tentatively assigned. All of these taxa possess an elongate, multi-segmented body and subtriangular exopods. This family occupies a basal position within a paraphyletic Megacheira, the immediate outgroup of Euarthropoda (crown-group arthropods). The resultant topology indicates that analyses that have resolved megacheirans as stem-chelicerates have done so because they have rooted on inappropriate taxa, e.g., trilobitomorphs and marrellomorphs.

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Briggs D. E. G. and Conway Morris S. 1986. Problematica from the middle Cambrian Burgess Shale of British Columbia, p. 167183. InHoffman A. and Nitecki M. H.(eds.), Problematic Fossil Taxa (Oxford Monographs on Geology and Geophysics no. 5). Oxford University Press and Clarendon Press, New York, 278 p.
Briggs D.E.G., Erwin D. H., and Collier F. J. 1994. The Fossils of the Burgess Shale. Smithsonian Institution Press, Washington, 238p.
Bruton D. L. and 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, Series B, 300:553582.
Budd G. E. 2002. A palaeontological solution to the arthropod head problem. Nature, 417:271275.
Budd G. E., Högström A. E. S., and Gogin I. 2001. A myriapod-like arthropod from the upper Cambrian of East Siberia. Paläontologische Zeitshrift, 75:3741.
Butterfield N. J. 2002. Leanchoilia guts and the interpretation of three-dimensional structures in Burgess Shale fossils. Paleobiology, 28:155171.
Caron J.-B., Gaines R. R., Mángano M. G., Streng M., and Daley A. 2010. A new Burgess Shale-type assemblage from the “thin” Stephen Formation of the southern Canadian Rockies. Geology, 38:811814.
Chen J.-Y., Waloszek D., and Maas A. 2004. A new “great-appendage” arthropod from the lower Cambrian of China and homology of chelicerate chelicerae and raptorial antero-ventral appendages. Lethaia, 37:320.
Collins D. 1996. “Evolution” of Anomalocaris and its classification in the arthropod Class Dinocarida (nov.) and Order Radiodonta (nov.). Journal of Paleontology, 70:280293.
Conway Morris S. 1979. The Burgess Shale (middle Cambrian) fauna. Annual Review of Ecology and Systematics, 10:327349.
Conway Morris S. 1989. The Burgess Shale faunas and the Cambrian Explosion. Science, 246:339346.
Cotton T. J. and Braddy S. J. 2004. The phylogeny of arachnomorph arthropods and the origin of the Chelicerata. Transactions of the Royal Society of Edinburgh, 94:169193.
Daley A. C., Budd G. E., Caron J.-B., Edgecombe G. D., and Collins D. 2009. The Burgess Shale anomalocaridid Hurdia and its significance for early euarthropod evolution. Science, 323:15971600.
Dunlop J. A. 2006. New ideas about the euchelicerate stem-lineage, p. 927. InDelshev C. and Stoey P.(eds.), European Arachnology 2005. Acta Zoologica Bulgarica, Supplement 1.
Edgecombe G. D. 2004. Morphological data, extant Myriapoda, and the myriapod stem-group. Contributions to Zoology, 73:207253.
Edgecombe G. D., García-Bellido D. C., and Paterson J. R. 2011. A new leanchoiliid megacheiran arthropod from the lower Cambrian Emu Bay Shale, South Australia. Acta Palaeontologica Polonica, 56:385400.
Farris J. S. 1983. The logical basis of phylogenetic analysis, p. 736. InPlatnick N. I. and Funk V. A.(eds.), Advances in Cladistic Analysis. Proceedings of the Second Meeting of the Willi Hennig Society, New York. Columbia University Press.
García-Bellido D. C. and Collins D. 2007. Reassessment of the genus Leanchoilia (Arthropoda, Arachnomorpha) from the middle Cambrian Burgess Shale, British Columbia, Canada. Palaeontology, 50:693709.
Goloboff P. A. 1999. Analysing large data sets in reasonable times: solutions for composite optima. Cladistics, 15:415428.
Goloboff P. A., Farris J. S., and Nixon K. C. 2008 a. TNT, a free program for phylogenetic analysis. Cladistics, 24:774786.
Goloboff P. A., Carpenter J. M., Arias J. Salvador, and Esquivel D. Rafael Miranda. 2008 b. Weighting against homoplasy improves phylogenetic analysis of morphological data sets. Cladistics, 24:758773.
Goloboff P. A., Farris J. S., Källersjö M., Oxelmann B., Ramírez M., and Szumik C. 2003. Improvements to resampling measures of group support. Cladistics, 19:324332.
Haug J. T., Briggs D. E. G., and Haug C. 2012 a. Morphology and function in the Cambrian Burgess Shale megacheiran arthropod Leanchoilia superlata and the application of a descriptive matrix. BMC Evolutionary Biology, 12:162.
Haug J. T., Waloszek D., Mass A., Liu Y., and Haug C. 2012 b. Functional morphology, ontogeny and evolution of mantis shrimp-like predators in the Cambrian. Palaeontology, 55:369399.
Hou X.-G. 1987. Two new arthropods from the lower Cambrian, Chengjiang, eastern Yunnan. Acta Palaeontologica Sinica, 26:236256.
Hou X.-G. and Bergström J. 1997. Arthropods from the lower Cambrian Chengjiang fauna, southwest China. Fossils and Strata, 45:1116.
Hou X.-G. and Bergström J. 1998. Three additional arthropods from the early Cambrian Chengjiang fauna, Yunnan, southwest China. Acta Palaeontologica Sinica, 37:395401.
Hou X.-G., Bergström J., and Aldridge R. J. 1995. Anomalocaris and other large animals from the lower Cambrian Chengjiang fauna of southwest China. GFF, 117:163183.
Hou X.-G., Aldridge R. J., Bergström J., Siveter D. J., Siveter D. J., and Feng X.-H. 2004. The Cambrian Fossils of Chengjiang, China. The Flowering of Early Animal Life. Blackwell Publishing, 233p.
Legg D. A., Sutton M. D., Edgecombe G. D., and Caron J.-B. 2012. Cambrian bivalved arthropod reveals origin of arthrodization. Proceedings of the Royal Society B: Biological Sciences, 279:46994704.
Liu Y., Hou X.-G., and Bergström J. 2007 . Chengjiang arthropod Leanchoilia illecebrosa (Hou, 1987) reconsidered. GFF, 129:263272.
Luo H.-L., Hu S.-X., Chen L.-Z., Zhang S.-S., and Tao Y.-H. 1999. Early Cambrian Chengjiang Fauna from Kunming Region, China. Yunnan Science and Technology Press, Kunming, 129p.
Miller W. J. 1942. An Introduction to Historical Geology with special reference to North America (fifth edition). D. Van Norstrand Company, Inc., 499p.
Nixon K. C. 1999. The parsimony ratchet, a new method for rapid parsimony analysis. Cladistics, 15:407414.
Osborn H. F. 1916. The Origin and Evolution of Life. On the Theory of Action, Reaction and Interaction of Energy. Charles Scribner and Sons, New York, 322p.
Stein M. 2010. A new arthropod from the early Cambrian of North Greenland, with a “great-appendage”-like antennula. Zoological Journal of the Linnaean Society, 158:477500.
Strausfeld N. J. 2012. Arthropod Brains: Evolution, Functional Elegance, and Historical Significance. Harvard University Press, 830p.
Ushakov P. V. 1974. Fauna of the U.S.S.R. Polychaetes volume 1—Polychaetes of the suborder Phyllodociformia of the Polar Basin of the Northwestern part of the Pacific. Academy of Sciences of the USSR, Zoological Institute, N.S. 102:1259.
von Siebold C. T. 1848. Lehrbuch der vergleichenden Anatomie der Wirbellosen Thiere, p. 1679. Invon Siebold C. T. and Stannius H.(eds.), Lehrbuch der vergleichenden Anatomie. Berlin. Verlag von Veit and Comp., 1845–1848, 679 p.
Walcott C. D. 1911. Cambrian Geology and Palaeontology II, No. 5—Middle Cambrian annelids. Smithsonian Miscellaneous Collections, 57:109144.
Walton L. B. 1927. The polychaete ancestory of the insects. I. The external structure. The American Naturalist, 61:226250.
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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
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