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New well-preserved scleritomes of Chancelloridae from the early Cambrian Yuanshan Formation (Chengjiang, China) and the middle Cambrian Wheeler Shale (Utah, USA) and paleobiological implications

  • Dorte Janussen (a1), Michael Steiner (a2) and Zhu Maoyan (a3)

From the early Cambrian of Yunnan, China, new chancellorid scleritomes assigned to Allonnia junyuani new species are described and compared with scleritomes of Chancelloria eros Walcott, 1920 from the Middle Cambrian of Utah, USA and isolated phosphatized chancellorid sclerites from the Georgina Basin of North Australia. Characters of the entirely preserved chancellorids offer new insight into the paleobiology of Chancelloridae. An irregular thickening at the inferred base of the narrow body end of Chancelloria eros from Utah is interpreted as a root bulb that anchored the sessile animal in the soft bottom sediment. Sclerites show gradual increase in size from the narrower towards the broader upper end of the chancellorid body. A central “gastral” lumen was not directly observed in any of the investigated specimens, but the orientation of sclerites towards the outer body surface indicates that the fossils are secondarily flattened due to compaction and were originally hollow. Taphonomy of isolated chancellorid sclerites from the Georgina Basin, Australia, indicates a biomineralization very different from that of sponge spicules, including the spongin spiculoids of demospongid Keratosa. Allonnia junyuani from Chengjiang (Yunnan) exhibits a prominent epidermis, probably with stable epithelian cell-to-cell connections. This feature excludes a sponge affiliation of the Chancelloridae and points towards a systematic position of this group within the epithelian-bearing animals and thus well above the Porifera.

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Ax, P. 1995. Das System der Metazoa I, Ein Lehrbuch der phylogenetischen Systematik. Gustav Fischer Verlag, Stuttgart, 226 p.
Bengtson, S. 1992. The cap-shaped Cambrian fossil Maikhanella and the relationship between Coeloscleritophorans and molluscs. Lethaia, 25:401420.
Bengtson, S., and Missarzhevsky, V. V. 1981. Coeloscleritophora—a major group of enigmatic Cambrian metazoans. U.S. Geological Survey Open-file Report, 81-743:1921.
Bengtson, S., Conway Morris, S., Cooper, B. J., Jell, P. A., and Runnegar, B. N. 1990. Early Cambrian fossils from South Australia. Association of Australasian Palaeontologists Memoirs, 9:1364.
Brasier, M. D. 1989. Towards a biostratigraphy of the earliest skeletal biotas, p. 117165. In Cowie, J. W. and Brasier, M. D. (eds.). The Precambrian-Cambrian Boundary. Clarendon Press, Oxford.
Briggs, D. E. G., Erwin, D. H., and Collier, F. J. 1994. The Fossils of the Burgess Shale. Smithsonian Institution Press, Washington, 238 p.
Brock, G. A., and Cooper, B. J. 1993. Shelly fossils from the Early Cambrian (Toyonian) Wirrealpa, Aroona Creek, and Ramsay limestones of South Australia. Journal of Paleontology, 67:758787.
Butterfield, N. J. 1990. A reassessment of the enigmatic Burgess Shale fossil Wiwaxia corrugata (Matthew) and its relationship to the polychaete Canadia spinosa Walcott. Paleobiology, 16:287303.
Butterfield, N. J., and Nicholas, C. J. 1996. Burgess Shale-type preservation of both non-mineralizing and “shelly” Cambrian organisms from the Mackenzie Mountains, northwestern Canada. Journal of Paleontology, 70:893899.
Chen, J.-Y., and Zhou, G.-Q. 1997. Biology of the Chengjiang fauna. Taiwan National Museum of Natural Science Bulletin, 10:11105.
Chen, J.-Y., Zhou, G.-Q., Zhu, M.-Y., and Yeh, K. 1996. The Chengjiang Biota—A Unique Window of the Cambrian Explosion. Taiwan National Museum of Natural Science, Taichung, 222 p. (In Chinese)
Conway Morris, S. 1998. The Crucible of Creation. Oxford University Press, Oxford, 242 p.
Deiss, C. 1938. Cambrian formations and sections in part of the Cordilleran trough. Geological Society of America Bulletin, 49:10671168.
Ding, L.-F., Zhang, L.-Y., Li, Y., and Dong, J.-S. 1992. The Study of the Late Sinian-Early Cambrian Biota from the Northern Margin of the Yangtze Platform. Scientific and Technical Documents Publishing House, 156 p. (In Chinese with English summary)
Doré, F., and Reid, R. E. H. 1965. Allonnia tripodophora nov. gen., nov. sp., nouvelle éponge du Cambrien inférieur de Carteret (Manche). Comptes Rendus Sommaires Séances Société Géologique de la France, 1965:2021.
Elrick, M., and Hinnov, L. A. 1996. Millennial-scale climate origins for stratification in Cambrian and Devonian deep-water rhythmites, western USA. Palaeogeography, Palaeoclimatology, Palaeoecology, 123:353372.
Fuchs, G., and Mostler, H. 1972. Der erste Nachweis von Fossilien (kambrischen Alters) in der Hazira-Formation, Hazara, Pakistan. Geologische, Paläontologische Mitteilungen der Universität Innsbruck, 2:112.
Goryansky, V. Y. 1973. On the necessity of excluding the genus Chancelloria Walcott from the phylum Porifera. Trudy Institut Geologii i Geofiziki So AN SSSR, 49:3944. (In Russian)
Gunther, L. F., and Gunther, V. G. 1981. Some Middle Cambrian fossils of Utah. Bringham Young University Geology Studies, 28:182.
Hou, X., Bergström, J., Wang, H., Feng, X., and Chen, A. 1999. The Chengjiang Fauna. Yunnan Science and Technology Press, 170 p. (In Chinese with English abstract)
James, N. P., and Clappa, C. F. 1983. Petrogenesis of Early Cambrian reef limestones, Labrador, Canada. Journal of Sedimentary Petrology, 53:10511096.
Li, C., Chen, J., and Hua, T. 1998. Precambrian sponges with cellular structures. Nature, 279:879882.
Li, G.-X. 1999. Early Cambrian chancellorids from Emei, Sichuan Province, SW China. Acta Palaeontologica Sinica, 38:238247.
Luo, H., Jiang, Z., Wu, X., Song, X., and Ouyang, L. 1982. The Sinian-Cambrian Boundary in Eastern Yunnan, China. Yunnan Institute of Geological Sciences, PR. China, 265 p. (In Chinese with English abstract)
Mehl, D. 1996. Organization and microstructure of the chancellorid skeleton: Implications for the biomineralization of the Chancelloridae. Bulletin de 1'Institut océanographique de Monaco, no. spécial 14(4):377385.
Mehl, D. 1998. Porifera and Chancelloridae from the Middle Cambrian of the Georgina Basin, Australia. Palaeontology, 41:11531182.
Mehl, D., and Reitner, J. 1991. Monophylie und Systematik der Porifera. Verhandlungen der Deutschen Zoologischen Gesellschaft, 1991:447.
Mehl-Janussen, D. 1999. Die frühe Evolution der Porifera. Münchner Geowissenschaftliche Abhandlungen, Reihe A, 37:172.
Mostler, H. 1980. Zur Mikrofauna des Unterkambriums in der Haziraformation—Hazara, Pakistan. Naturhistorisches Museum Wien Annalen, 83:245257.
Mostler, H. 1995. Neue heteractinide Spongien (Calcispongea) aus dem Unter- und Mittelkambrium. Naturwissenschaftlich-medizinischer Verein Innsbruck Berichte, 72:732.
Mostler, H., and Mosleh-Yazdi, A. 1976. Neue Poriferen aus oberkambrischen Gesteinen der Milaformation im Elburzgebirge (Iran). Geologische, Paläontologische Mitteilungen der Universität Innsbruck, 5:136.
Müller, F. 1865. Über Darwinella aurea, einen Schwamm mit sternförmigen Hornnadeln. Archiv für Mikroskopische Anatomie, 1:343453.
Pickett, J. 1982. Vacaletia progenitor, the first Tertiary sphinctozoan (Porifera). Alcheringa, 6:241247.
Qian, Y. 1977. Hyolitha and some prpblematica from the Lower Cambrian Huangshandong Formation in the eastern part of the Yangtze Gorge. Acta Palaeontologica Sinica, 2:255278. (In Chinese with English abstract)
Qian, Y. 1989. Stratigraphy and Palaeontology of Systemic Boundaries in China, Precambrian-Cambrian Boundary 2. Nanjing University Publishing House, Nanjing, 341 p.
Qian, Y., and Bengtson, S. 1989. Palaeontology and biostratigraphy of the Early Cambrian Meishucunian Stage in Yunnan Province, South China. Fossils and Strata, 24:1156.
Qian, Y., Chen, M.-E., He, T., Zhu, M.-Y., Yin, G-Z., Feng, W-M., Xu, J.-T., Jiang, Z.-W., Liu, D.-Y., Liu, G., Xiao, B., Ding, L.-F., and Mao, Y.-Q. 1999. Taxonomy and biostratigraphy of small shelly fossils in China. Science Press, Beijing, 247 p.
Rees, M. N., and Robison, R. A. 1989. Cambrian stratigraphy and paleontology of the central House Range and Drum Mountains, Utah, p. 5986. In Taylor, M. E. (ed.), Cambrian and Early Ordovician Stratigraphy and Paleontology of the Basin and Range Province, Western United States. Field Trip Guidebook T125, 28th International Geologic Congress.
Reid, R. E. H. 1959. Occurrence of Chancelloria Walcott in the Comley limestone. Geological Magazine, 96:261262.
Reitner, J., and Mehl, D. 1996. Monophyly of the Porifera. Verhandlungen des naturwissenschaftlichen Vereins in Hamburg (Neue Folge), 36:532.
Reitner, J., Wörheide, G., Lange, R., and Thiel, V. 1997. Biomineralization of calcified skeletons in three Pacific coralline demosponges—an approach to the evolution of basal skeletons. Courier Forschungsinstitut Senckenberg, 201:371383.
Rigby, J. K. 1966. Protospongia hicksi Hinde from the Middle Cambrian of western Utah. Journal of Paleontology, 40:549554.
Rigby, J. K. 1969. A new Middle Cambrian hexactinellid sponge of western Utah. Journal of Paleontology, 43:125128.
Rigby, J. K. 1978. Porifera of the Middle Cambrian Wheeler Shale from the Wheeler Amphitheater, House Range, in western Utah. Journal of Paleontology, 52:13251345.
Rigby, J. K. 1986. Sponges of the Burgess Shale (Middle Cambrian), British Columbia. Paleontographica Canadiana, 2:1105.
Rigby, J. K. 1990. A new Middle Cambrian hexactinellid, Ratcliffespongia wheeled from western Utah, and skeletal structure of Ratcliffespongia. Journal of Paleontology, 64:331334.
Robison, R. A. 1960. Lower and Middle Cambrian stratigraphy of the Eastern Great Basin. Intermountain Association of Petroleum Geologists 11th Annual Field Conference, p. 4352.
Robison, R. A. 1964a. Late Middle Cambrian faunas from western Utah. Journal of Paleontology, 38:510566.
Robison, R. A. 1964b. Upper Middle Cambrian stratigraphy of western Utah. Geological Society of America Bulletin, 75:9951010.
Robison, R. A. 1991. Middle Cambrian biotic diversity: examples from four Utah Lagerstätten, p. 7793. In Simonetta, A. M. and Conway Morris, S. (eds.), The Early Evolution of Metazoa and the Significance of Problematic Taxa. Cambridge University Press.
Sdzuy, K. 1969. Unter- und mittelkambrische Porifera (Chancellorida und Hexactinellida). Paläontologische Zeitschrift, 43:115147.
Shergold, J. H., and Southgate, P. N. 1986. Middle Cambrian phosphatic and calcareous lithofacies along the eastern margin of the Georgina Basin, Western Queensland. Australasian Sedimentologists Group Field Guide Series, 2:189.
Siegmund, H. 1995. Fazies und Genese unterkambrischer Phosphorite und mariner Sedimente der Yangtze-Plattform, Südchina. Berliner Geowissenschaftliche Abhandlungen, Reihe A, 173:1114.
Simpson, T. L. 1984. The Cell Biology of Sponges. Springer, New York, 662 p.
Soest, R. W. M. van. 1991. Demosponge higher taxa classification reexaminated, p. 5471. In Reitner, J. and Keupp, H. (eds.), Fossil and Recent Sponges. Springer, Berlin.
Walcott, C. D. 1908a. Nomenclature of some Cambrian Cordilleran formations. Smithsonian Miscellaneous Collections, 53(1):112.
Walcott, C. D. 1908b. Cambrian sections of the Cordilleran area. Smithsonian Miscellaneous Collections, 53(5):167230.
Walcott, C. D. 1911. Cambrian geology and paleontology, Middle Cambrian annelids. Smithsonian Miscellaneous Collections, 57(5):109145.
Walcott, C. D. 1920. Middle Cambrian Spongiae. Smithsonian Miscellaneous Collections, 67:261364.
Wheeler, H. E. 1948. Late Precambrian-Cambrian stratigraphic cross-section through southern Nevada. University of Nevada Geological and Mineralogical Series Bulletin, 47:158.
Yochelson, E. 1993. Molluscan affinity of coeloscleritophorans. Lethaia, 26:4748.
Zhao, Y.-L., Yuan, J.-L., Zhu, M.-Y., Yang, R.-D., Qian, Y., Huang, Y-Z., Guo, Q.-J., and Pan, Y. 1999. A progress report on research on the early Middle Cambrian Kaili biota, Guizhou Province, PRC. Acta Palaeontological Sinica, 38, supl.:114. (In Chinese with English abstract)
Zhu, M.-Y. 1992. Taphonomy of Chengjiang fossils, Yunnan. Dissertation, Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing, 136 p. (In Chinese)
Zhu, M.-Y., Qian, Y., Jiang, Z.-W., and He, T.-G. 1996. A preliminary study on the preservation, shell composition and microstructures of Cambrian small shelly fossils. Acta Micropalaeontologica Sinica, 13(3):241254.
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