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Bulletin of Geosciences
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Czech Geological Survey,
W. Bohemia Museum Pilsen
ISSN: 1802-8225 (online),
Early Cambrian eodiscoid trilobite Hupeidiscus orientalis from South China: ontogeny and implications for affinities of Mongolitubulus-like sclerites
Published in: Bulletin of Geosciences, volume 87, issue 1; pages: 159 - 169; Received 12 September 2010; Accepted in revised form 6 October 2011; Online 10 February 2012
Keywords: eodiscoid, Hupeidiscus, sclerite, Mongolitubulus, Lower Cambrian, South China,
AbstractDelicately phosphatized specimens of the eodiscoid Hupeidiscus orientalis were documented from the lower Cambrian Shuijingtuo Formation through acetic acid maceration of limestone samples. The material enables us to better understand the meraspid to holaspid ontogenetic development of H. orientalis, and to evaluate its relations with other eodiscoid taxa occurring in South China. The development of its pygidium and thoracic segments is very similar to that of “Shizhudiscus” longquanensis, suggesting that Shizhudiscus is a junior synonym of Hupeidiscus. However, the synonymization of Hupeidiscus with Tsunyidiscus remains open as little is known about the ontogeny of the latter genus. The spines of H. orientalis are of particular importance. Like the enigmatic sclerite taxon Mongolitubulus, its spines are ornamented with a distinctive scaly sculpture, shedding new light on the origin and affinities of Mongolitubulus-like sclerites. The squamose ornament was gradually transformed from granules on the exoskeletal surface at the base of the spines. Other strands of evidence, e.g., the outline, exuviating growth, and the spatio-temporal distribution, also suggest that some isolated sclerites previously assigned to Mongolitubulus are possibly related to the spines of eodiscoid trilobites. This finding implies that such morphologically similar spines may be essentially of multiple pan-arthropod origins (bradoriids, eodiscoids, etc.), and they may be of morphologic analogues rather than homologues, suggesting that Mongolitubulus shall be cautiously used as a generic name unless the circumstance of its type specimens from Mongolia gets clarified.
Babcock, L.E. 1994. Systematics and phylogenetics of polymeroid trilobites from the Henson Gletscher and Kap Stanton formations (Middle Cambrian), North Greenland. Bulletin Gronlands Geologiske Undersogelse 169, 79-127.
Bengtson, S. 1985. Taxonomy of disarticulated fossils. Journal of Paleontology 59, 1350-1358.
Bengtson, S. & Conway Morris, S. 1984. A comparative study of Lower Cambrian Halkieria and Middle Cambrian Wiwaxia. Lethaia 17, 307-329.
Cederström, P., Ahlberg, P., Clarkson, E.N.K., Nilsson, C.H. & Axheimer, N. 2009. The Lower Cambrian eodiscoid trilobite Calodiscus lobatus from Sweden: morphology, ontogeny and distribution. Palaeontology 52, 491-539.
Chang, W.T. 1966. On the classification of Redlichiacea, with description of new families and new genera. Acta Palaeontologica Sinica 14, 135-184. [in Chinese with English summary]
Chen, J.Y., Hou, X.G. & Lu, H.Z. 1989. Early Cambrian netted scale-bearing worm-like sea animal. Acta Palaeontologica Sinica 28, 1-16. [in Chinese with English summary]
Conway Morris, S. 1997. The cuticular structure of the 495-Myr-old type species of the fossil worm Palaeoscolex, P. piscatorum (?Priapulida). Zoological Journal of the Linnean Society 119, 69-82.
Conway Morris, S. & Chen, M. 1997. Cambroclaves and paracarinachitids, early skeletal problematic metazoans from the Lower Cambrian of South China. Palaeontology 34, 357-397.
Conway Morris, S. & Peel, J. 1990. Articulated halkieriids from the Lower Cambrian of North Greenland. Nature 345, 802-805.
Dzik, J. 2003. Early Cambrian lobopodian sclerites and associated fossils from Kazakhstan. Palaeontology 46, 93-112.
Esakova, V.V. & Zhegallo, E.A. 1996. Biostratigrafiya i fauna Nizhnego Kembriya Mongolii [Biostratigraphy and fauna of the Lower Cambrian of Mongolia]. 216 pp. Nauka, Moscow. [in Russian]
Fortey, R.A. 1990. Ontogeny, hypostome attachment and trilobite classification. Palaeontology 33, 529-576.
Gazdzicki, A. & Wrona, R. 1986. Polish paleontological investigation in West Antarctica in 1986. Prezglad Geologicyny 34, 609-617. [in Polish with English and Russian summaries]
Hinz, I., Kraft, P.,Mergl, M. & Müller, K. 1990. The problematic Hadimopanella, Kaimenella, Milaculum and Utahphospha identified as sclerites of Palaeoscolecida. Lethaia 23, 217-221.
Jell, P.A. 1997. Introduction to Suborder Eodiscina Kobayashi 1939, 383-404. In Kaesler, R.L. (ed.) Treatise on invertebrate paleontology. Part O. Arthropoda 1. Trilobita, Revised. Volume 1, Introduction, Order Agnostida, Order Redlichiida. Geological Society of America and University of Kansas, Boulder, Colorado and Lawrence, Kansas.
Li, G.X. & Holmer, L.E. 2004. Early Cambrian lingulate brachiopods from the Shaanxi Province, China. GFF 126, 193-211.
Li, G.X., Zhu, M.Y. & Steiner, M. 2003. Microstructure and functional morphology of the Early Cambrian problematical fossil Rhombocorniculum. Progress in Natural Science 13, 831-835.
Li, G.X., Zhu, M.Y., Steiner, M. & Qian, Y. 2004. Skeletal faunas from the Lower Cambrian Qiongzhusian of southern Shaanxi: biodiversity and lithofacies-biofacies links in carbonate settings. Progress in Natural Science 14, 91-96.
Li, S.J. 1980. Trilobites from the Chiulaotung Formation (Lower Cambrian) in Mt. Emei area, western Sichuan. Acta Palaeontologica Sinica 19, 42-50. [in Chinese with English summary]
Lin, T.R., Peng, S.C. & Zhu, X.J. 2004. Restudy on the eodiscoids from the Shuijingtuo Formation (Early Cambrian) in eastern Yangtze Gorge area, western Hubei. Acta Palaeontologica Sinica 43, 502-514. [in Chinese with English summary]
Lu, Y.H., Chang, W.T., Qian, Y.Y., Zhu, Z.L. & Lin, H.L. 1974. Cambrian trilobites, 82-107. In Nanjing Institute of Geology and Palaeontology (ed.) Handbook of Stratigraphy and Palaeontology of southwestern China. Science Press, Beijing. [in Chinese]
Melnikova, L.M. 2000. A new genus of Bradoriidae (Crustacea) from the Cambrian of northern Eurasia. Paleontological Journal 34, 180-185.
Missarzhevsky, V.V. 1977. Konodonty (?) i fosfantnye problematiki kembriya Mongolii i Sibiri [Conodonts (?) and phosphatic problematica from the Cambrian of Mongolia and Siberia], 10-19. In Tatarinov, L.P. (ed.) Bespozvonochnye Paleozoya Mongolii. Trudy Sovmestaya Sovetsko-Mongolskaya Paleonotologicheskaya Ekspeditsiya. Nauka, Moscow. [in Russian]
Peel, J.S. & Blaker, M.R. 1988. The small shelly fossil Mongolitubulus from the Lower Cambrian of North Greenland. Rapport Gronlands geologiske Undersogelse 137, 55-60.
Qian, Y. 1999. Taxonomy and biostratigraphy of small shelly fossils in China. 247 pp. Science Press, Beijing. [in Chinese with English summary]
Shergold, J.H. 1991. Protaspid and early meraspid growth stages of the eodiscoid trilobite Pagetia ocellata Jell. Alcheringa 15, 65-86.
Skovsted, C.B. & Peel, J.S. 2001. The problematic fossil Mongolitubulus from the Lower Cambrian of Greenland. Bulletin of the Geological Society of Denmark 48, 135-147.
Skovsted, C.B., Holmer, L.E., Larsson, C.M., Högström, A.E.S., Brock, G.A., Topper, T.P., Balthasar, U., Stolk, S.P. & Paterson, J.R. 2009. The scleritome of Paterimitra, an Early Cambrian stem group brachiopod from South Australia. Proceeding of the Royal Society of London B 276, 1651-1656.
Steiner, M., Li, G.X., Qian, Y., Zhu, M.Y. & Erdtmann, B.D. 2007. Neoproterozoic to early Cambrian small shelly fossil assemblages and a revised biostratigraphic correlation of the Yangtze Platform (China). Palaeogeography, Palaeoclimatology, Palaeoecology 254, 67-99.
Steiner, M., Zhu, M.Y., Weber, B. & Geyer, G. 2001. The Lower Cambrian of eastern Yunnan, trilobite-based biostratigraphy and related faunas. Acta Palaeontologica Sinica 40 (Supplement), 63-79.
Topper, T.P., Skovsted, C.B., Brock, G.A. & Paterson, J.R. 2007. New bradoriids from the lower Cambrian Mernmerna Formation, South Australia, systematics, biostratigraphy and biogeography. Memoirs of the Association of Australasian Palaeontologists 33, 67-100.
Xie, Y.S. 1988. Small shelly fossils in Qiongzhusi Stage of Lower Cambrian in Zhenba County, Shaanxi Province. Journal of Chengdu College of Geology 15(4), 21-29. [in Chinese with English summary]
Yang, A.H., Zhu, M.Y., Zhang, J.M. & Li, G.X. 2003. Early Cambrian eodiscoid trilobites of the Yangtze Platform and their stratigraphic implications. Progress in Natural Science 13, 861-866. [in Chinese with English summary]
Yuan, J.L. & Zhao, Y.L. 1999. Subdivision and correlation of Lower Cambrian in southwest China, with a discussion of the age of Early Cambrian Series biotas. Acta Palaeontologica Sinica 38 (Supplement), 116-131. [in Chinese with English summary]
Zhang, W.T. 1987. World’s oldest Cambrian trilobites from Yunnan, 1-17. In Nanjing Institute of Geology and Palaeontology, Academia Sinica (ed.) Stratigraphy and Palaeontology of Systemic boundaries in China, Precambrian-Cambrian boundary 1. Nanjing University Publishing House, Nanjing.
Zhang, W.T., Lu, Y.H., Zhu, Z.L., Qian, Y.Y., Lin, H.L., Zhou, Z.Y., Zhang, S.G. & Yuan, J.L. 1980. Cambrian trilobite faunas of southwestern China. Palaeontologica Sinica, New series B 16, 1-497. [in Chinese with English summary]
Zhang, X.G. 1989. Ontogeny of an Early Cambrian eodiscoid trilobite from Henan, China. Lethaia 22, 13-29.
Zhang, X.G. & Clarkson, E.N.K. 1990. The eyes of Lower Cambrian eodiscid trilobites. Palaeontology 33, 911-932.
Zhang, X.G. & Clarkson, E.N.K. 1993. Ontogeny of the eodiscid trilobite Shizhudiscus longquanensis from the Lower Cambrian of China. Palaeontology 36, 785-806.
Zhu, C.F., Li, G.X.&Dong, X.P. 2004. Ornamented tubules from Middle Cambrian of Huayuan, west Hunan, China. Acta Scientiarum Naturalium Universitatis Pekinensis 40, 193-202. [in Chinese with English summary]
Zhu, M.Y., Babcock, L.E. & Peng, S.C. 2006. Advances in Cambrian stratigraphy and paleontology, integrating correlation techniques, paleobiology, taphonomy and paleoenvironmental reconstruction. Palaeoworld 15, 217-222.