Skip to main content Accessibility help
×
Home

A new arthropod Jugatacaris agilis n. gen. n. sp. from the Early Cambrian Chengjiang biota, South China

  • Dongjing Fu (a1) and Xingliang Zhang (a1)

Abstract

A new arthropod Jugatacaris agilis n. gen. n. sp. with excellent soft anatomy is reported from the Early Cambrian Chengjiang biota. Its “bivalved” carapace with a dorsal fin-like fusion is distinct from those of other Cambrian arthropods. A pair of stalked eyes and a prominent median eye protrudes the carapace anteriorly. The cephalon, attaching to the carapace through the lateral adductor muscles at maxillary segment, bears an antennule, antenna and mandible. The trunk is comprised of a large number of segments (varying from 55 to 65), two-thirds of which is covered by the carapace. Each segment, except for the posterior three to five, carries a pair of uniform biramous appendages. The endopodite is composed of 30 podomeres and a terminal claw. The oar-shaped exopododite is fringed with filaments and distally bears a broad setiferous lobe. Trunk terminates with a conical telson and a pair of broad furcal rami serving as steering devices. Internal features like gonad and gut have also been found. The presence of the food groove combined with other morphological features indicates that Jugatacaris was a filter feeder. The appendages design associated with the overall body-plan supports the view that Jugatacaris is a crustaceanomorph. The accurate phylogenic assessment will remain the subject of debate until more information becomes available.

Copyright

References

Hide All
Briggs, D. E. G. 1976. The arthropod Branchiocaris n. gen., Middle Cambrian, Burgesss Shale, British Columbia. Geological Survey of Canada Bulletin, 264:129.
Briggs, D. E. G. 1977. Bivalved arthropods from the Cambrian Burgess Shale of British Columbia. Palaeontology, 20:595621.
Briggs, D. E. G. 1978. The morphology, mode of life, and affinities of Canadaspis perfecta (Crustacea: Phyllocarida), Middle Cambrian, Burgess Shale, British Columbia. Philosophical Transactions of the Royal Society of London B, 281:439487.
Briggs, D. E. G. 1981. The arthropod Odaraia alata Walcott, Middle Cambrian, British Columbia. Philosophical Transactions of the Royal Society, London B, 291:541584.
Briggs, D. E. G., Erwin, D. H., and Collier, F. J. 1994. The fossil and the Burgess Shale. Smithsonian Institution Press, Washington and London, 238 p.
Brusca, R. C. and Brusca, G. J. 2003. Invertebrates. Sinauer Associates, Sunderland, Massachusetts, 936 p.
Budd, G. E. 1999. A nektaspid arthropod from the Early Cambrian Sirius Passet fauna, with a description of retrodeformation based on functional morphology. Palaeontlology, 42:99122.
Budd, G. E. 2002. A palaeontological solution to the arthropod head problem. Nature, 417:271275.
Budd, E. G. 2008. Head structure in upper stem-group euarthropods. Palaeontology, 51:561573.
Budd, E. G. and Jensen, S. R. 2000. A critical reappraisal of the fossil record of the bilaterian animal phyla. Biological Reviews, 75:253295.
Chen, J.-Y. 2004. The dawn of animal world. Jiangsu Science and Technology Press, Chian, 366 p. (In Chinese).
Chernysheva, N. E. 1960. Osnovy paleontologii: chlenistonogie, trilobitoobraznye I rakoobraznye [Principles of palaeontology: arthropods, Trilobitomorpha and Crustaceomorpha], 201-206. Gosudarstvennoe Nauchno Tekhnicheskoe Izdadelstvo Literatury po Geologii i Okhrane Nedr, Moskva, 516 p.
Conway Morris, S., Pell, J. S., Higgins, A. K., Soper, N. J., and Davis, N. C. 1987. A Burgess Shale-like fauna from the Lower Cambrian of North Greenland. Nature, 345:802805.
Edgecombe, G. D. 2010. Arthropod phylogeny: an overview from the perspective of morphology, molecular data and the fossil record. Arthropod Structure & Development, 39:7487.
Harrington, H. J. 1959. General description of Trilobita, p. 38117. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. O. Arthropoda 1. Geological Society of America and University of Kansas Press, Lawrence.
Harvey, T. H. P. and Butterfield, N. J. 2008. Sophisticated particle-feeding in a large Early Cambrian crustacean. Nature, 452:868871.
Hou, X.-G. 1987a. Early Cambrian large bivalved arthropods from Chengjiang, easten Yunnan. Acta Palaeontologica Sinica, 26:286298. (In Chinese).
Hou, X.-G. 1987b. Three new large arthropods from Lower Cambrian, Chengjiang, eastern Yunnan. Acta Palaeontologica Sinica, 26:272285. (In Chinese).
Hou, X.-G. 1999. New rare bivalved arthropods from Lower Cambrian Chengjiang fauna, Yunnan, China. Journal of Paleontology, 73:102116.
Hou, X.-G., Aldridge, R. J., Bergström, J., Siveter, D. J., and Feng, X.-H. 2004a. The Cambrian fossils of Chengjiang, China: the flowering of early animal life. Blackwell Publishing, Oxford, U.K., 233 p.
Hou, X.-G. and Bergström, J. 1991. The arthropods of the Lower Cambrian Chengjiang fauna, with relationships and evolutionary significance, p. 179187. In Simonetta, A. M. and Conway Morris, S. (eds.), The Early Evolution of Metazoan and the Significance of Problematic Taxa. Cambridge University Press, Cambridge.
Hou, X.-G. and Bergström, J. 1997. Arthropod of the Lower Cambrian Chengjiang fauna, southwest China. Fossils and Strata, 45:1116.
Hou, X.-G., Bergström, J., Wang, H.-F., Feng, X.-H., and Chen, A.-L. 1999. The Chengjiang Fauna. Exceptionally Well-Preserved Animals from 530 Million Years Ago. Yunnan Science and Technology Press, Kunming, 170 p. (In Chinese).
Hou, X.-G., Bergström, J., and Xu, G.-X. 2004b. The Lower Cambrian Crusracean Pectocaris from the Chengjiang biota, Yunnan, China. Journal of Paleontology, 78:700708.
Hou, X.-G., Ramsköld, L., and Bergström, J. 1991. Composition and preservation of the Chengjiang fauna-a Lower Cambrian soft-bodied biota. Zoologica Scripta, 20:395411.
Hou, X.-G. and Sun, W.-G. 1988. Discovery of Chengjiang fauna at Meishucun, Jinning, Yunnan. Acta Palaeontologica Sinica, 27:112. (In Chinese).
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, China. 129 p. (In Chinese).
Moore, R. C. and McCormick, Lavon. 1969. General features of Crustacea, p. 57120. In Moore, R. C. (ed.), Treatise on Invertebrate Paleontology, Pt. R. Arthropoda 4. Geological Society of America and University of Kansas Press, Lawrence.
Müller, K. J. 1983. Crustacea with preserved soft parts from the Upper Cambrian of Sweden. Lethaia, 16:93109.
Nedin, C. 1995. The Emu Bay Shale, a Lower Cambrian fossil Lagerstätten, Kangaroo Island, South Austrilia. Memoirs of the Association of Australian Palaeontologists, 18:3140.
Nedin, C. 1999. Anomalocaris predation on nonmineralized and mineralized trilobites. Geology, 27:987990.
Resser, C. E. 1929. New Lower and Middle Cambrian Crustacean. Proceeding U. S. National Museum, 76:118.
Paterson, J. R., Gehling, J. G., García-Bellido, D. C., Edgecombe, G. D., and Lee, M. S. Y. 2008. Early Cambrian arthropods from the Emu Bay Shale Lagerstätte, South Austrilia, p. 319325. In Rábano, I., Gozalo, R. and García-Bellido, D. (eds.), Advances in trilobite research. Instituto Geológico y Minero de España, Madrid.
Simonetta, A. M. and Delle Cave, L. 1975. The Cambrian non trilobite arthropods from the Burgess Shale of British Columbia. A study of their comparative morphology, taxonomy and evolutionary signigicance. Palaeontography Italy, 69, 37 p.
Stein, M., Peel, J.S., Siveter, D.J., and Williams, M. 2010. Isoxys (Arthropoda) with preserved soft anatomy from the Sirius Passet Lagerstätte, Lower Cambrian of North Greeland. Lethaia, 43:258265.
Taylor, R. S. 2002. A new bivalved arthropod from the early Cambrain Sirius Passet fauna, North Greenland. Palaeontology, 45:97123.
Vannier, J. and Abe, K. 1992. Recent and Early Palaeozoic Myodocope Ostracodes: functional morphology, phylogeny, distribution and lifestyles. Palaeontology, 35:485517.
Vannier, J. and Abe, K. 1995. Size, body plan and respiration in the Ostracoda. Palaeontology, 38:843873.
Vannier, J., Boissy, P., and Racheboeuf, P. R. 1997. Locomotion in Nebalia bipes: a possible model for Palaeozoic phyllocarid crustaceans. Lethaia, 30:89104.
von Siebold, C. T. E. and Stannius, H. 1845. Lehruch der verliechenden Anatomie der wirbellosen Tiere. Viet, Berlin.
Walcott, C. D. 1912. Cambrian geology and paleontology. No. 6. Middle Cambrian Branchiopoda, Malacostraca, Trilobita, and Merostomata. Smithsonian Miscellaneous Collections, 57:145229.
Walossek, D. 1993. The Upper Cambrian Rehbachiella and the phylogeny of Branciopoda and Crustacea. Fossils and Strata, 32:1202.
Waloszek, D., Chen, J.-Y., Maas, A., and Wang, X.-Q. 2005. Early Cambrian arthropods-new insights into arthropod head and structure evolution. Arthopod Structure and Development, 34:189205.
Walossek, D. and Müller, K. J. 1998a. Cambrian ‘Orsten’-type arthropods and the phylogeny of Crustacea, p. 139154. In Fortey, R. A. and Thomas, R. H. (eds.), Arthropod Relationships. Chapman and Hall, London.
Walossek, D. and Müller, K. J. 1998b. Early arthropod phylogeny in light of the Cambrian ‘Orsten’ fossils, p. 185231. In Edgecombe, G. D. (ed.), Arthropod Fossils and Phylogeny. Columbia University Press, New York.
Whittington, W. 1985. The Burgess Shale. Yale Unversity Press, New Haven, 256 p.
Wills, M. A. 1998. A phylogeny of recent and fossil Crustacea derived from morphological characters, p. 189210. In Fortey, R. A. and Thomas, R. H. (eds.), Arthropod Relationships. Chapman and Hall, London.
Zhang, X.-G., Siveter, D. J., Waloszek, D., and Maas, A. 2007. An epipodite-bearing crown-group crustacean from the Lower Cambrian. Nature, 449:595598.
Zhang, X.-L. and Briggs, D. E. G. 2007. The nature and significance of the appendages of Opabinia from the Middle Cambrian Burgess Shale. Lethaia, 40:161173.
Zhang, X.-L., Liu, W., and Zhao, Y.-L. 2008. Cambrian Burgess Shale-type Lagerstätten in South China: distribution and significance. Gondwana Research, 14:255262.
Zhang, X.-L. and Shu, D.-G. 2007. Soft anatomy of sunellid arthropods from the Chengjiang Lagerstätte, Lower Cambrian of Southwest China. Journal of Paleontology, 81:14121422.
Zhang, X.-L., Shu, D.-G., and Erwin, D. H. 2007. Cambrian naraoiids (Arthropoda): morphology, ontogeny, systematics, and evolutionary relationships. The Paleontological Society Memoir, 68, 52 p.
Zhang, X.-L., Shu, D.-G., Li, Y., and Han, J. 2001. New sites of Chengjiang fossils: Crucial windows on the Cambrian explosion. Journal of the Geological Society of London, 158:211218.
Zhao, Y.-L., Yuan, J.-L., Zhu, M.-Y., Yang, R.-D., Guo, Q.-J., Qian, Y., Huang, Y.-Z., and Pan, Y. 1999. A progress report on research on the early Middle Cambrian Kaili biota, Guizhou, P. R. C. Acta Palaeontologica Sinca, 38(Supplement):115.

A new arthropod Jugatacaris agilis n. gen. n. sp. from the Early Cambrian Chengjiang biota, South China

  • Dongjing Fu (a1) and Xingliang Zhang (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed