Paleontological Journal

, Volume 40, Issue 3, pp 234–243 | Cite as

New Cambrian lobopods and chaetognaths of the Siberian Platform

  • Yu. E. Demidenko


The association of isolated remains of lobopods with a netlike structure, including plates of Microdictyon rozanovi sp. nov. and sclerites with spinelike process of Onychomicrodictyon spiniferum gen. et sp. nov., as well as saberlike sclerites of Protohertzina yudomica sp. nov. interpreted as grasping spines of chaetognaths, is described from the middle part of the Inikan Formation of the Toyonian Stage of the Lower Cambrian (Lermontovia dzevanovskii Zone). The diagnoses and species composition of the genera Microdictyon and Protohertzina are refined.

Key words

lobopods protoconodonts Chaetognatha Early Cambrian Toyonian Stage Yudoma River Siberian Platform Russia 


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  1. 1.
    S. Bengtson, “The Structure of Some Middle Cambrian Conodonts, and the Early Evolution of Conodont Structure and Function,” Lethaia 9(2), 185–206 (1976).Google Scholar
  2. 2.
    S. Bengtson, “The Early History of the Conodonta,” Fossils and Strata, No. 15, 5–19 (1983).Google Scholar
  3. 3.
    S. Bengtson, “Oddballs from the Cambrian Start to Get Even,” Nature 351, 184–185 (1991).CrossRefGoogle Scholar
  4. 4.
    S. Bengtson, Morris S. Conway, B. J. Cooper, et al., Early Cambrian Fossils from South Australia (Assoc. Australas. Paleontol., Brisbane, 1990).Google Scholar
  5. 5.
    S. Bengtson, S. C. Matthews, and V. V. Missarzhevsky, “The Cambrian Netlike Fossil Microdictyon,” in Problematic Fossil Taxa (Univ. Press, New York, 1986), pp. 97–115.Google Scholar
  6. 6.
    J. Chen, X. Hou, and H. Lu, “Early Cambrian Netted Scale-Bearing Worm-Like Sea Animal,” Acta Palaeontol. Sin. 28, 1–16 (1989).Google Scholar
  7. 7.
    J. Chen, G. Zhou, M. Zhu, et al., The Chengjiang Biota: A Unique Window of the Cambrian Explosion (Natl. Museum Nat. Sci., Taichung, Taiwan, 1996).Google Scholar
  8. 8.
    E. N. K. Clarkson, “The Eye: Morphology, Function, and Evolution,” in Treatise on Invertebrate Paleontology: Part O. Arthropoda 1: Trilobita, Revised (Univ. Kansas Press, Lawrence, 1997), Vol. 1, pp. 114–132.Google Scholar
  9. 9.
    J. Dzik, “Early Cambrian Lobopodian Sclerites and Associated Fossils from Kazakhstan,” Palaeontology 46 Part 1, 93–112 (2003).CrossRefGoogle Scholar
  10. 10.
    N. V. Esakova and E. A. Zhegallo, Biostratigraphy and Fauna of the Lower Cambrian of Mongolia (Nauka, Moscow, 1996) [in Russian].Google Scholar
  11. 11.
    R. L. Ethington and D. L. Clark, “Lower and Middle Ordovician Conodonts from the Ibex Area, Western Millard County, Utah,” Brigham Young Univ. Geol. Stud. 28(2), 1–160 (1981).Google Scholar
  12. 12.
    D. I. Gravestock, E. M. Alexander, Yu. E. Demidenko, et al., The Cambrian Biostratigraphy of the Stansbury Basin, South Australia (MAIK Nauka/Interperiodica, Moscow, 2001).Google Scholar
  13. 13.
    N. V. Grigorieva, “Skeletal Problematical Organisms,” in Subdivision of the Lower Cambrian of Siberia into Stages: Atlas of Fossils (Nauka, Moscow, 1983), pp. 155–169 [in Russian].Google Scholar
  14. 14.
    Y. Hao and D. Shu, “The Oldest Known Well-Preserved Phaeodaria (Radiolaria) from Southern Shaanxi,” Geoscience 1(3/4), 301–310 (1987).Google Scholar
  15. 15.
    I. Hinz, “The Lower Cambrian Microfauna of Comley and Rushton, Shropshire, England,” Palaeontogr. Abt. A 198(1/2), 41–100 (1987).Google Scholar
  16. 16.
    X. G. Hou and J. Bergström, “Cambrian Lobopodians—Ancestors of Extant Onychophorans?,” Zool. J. Linn. Soc. 114, 3–19 (1995).CrossRefGoogle Scholar
  17. 17.
    A. Yu. Ivantsov, A. Yu. Zhuravlev, V. A. Krassilov, et al., Unique Sinian Localities of Early Cambrian Organisms (Siberian Platform) (Nauka, Moscow, 2005) [in Russian].Google Scholar
  18. 18.
    V. V. Missarzhevsky, “Paraconodont Organisms from the Cambrian-Precambrian Boundary Beds of the Siberian Platform and Kazakhstan,” in Problems in Paleontology and Biostratigraphy of the Lower Cambrian of Siberia and the Russian Far East (Nauka, Novosibirsk, 1973), pp. 53–57 [in Russian].Google Scholar
  19. 19.
    V. V. Missarzhevsky, The Earliest Skeletal Fossils and the Stratigraphy of the Precambrian-Cambrian Boundary Beds (Nauka, Moscow, 1989) [in Russian].Google Scholar
  20. 20.
    V. V. Missarzhevsky and A. M. Mambetov, The Stratigraphy and Fauna of the Cambrian-Precambrian Boundary Beds of the Lesser Karatau Range (Nauka, Moscow, 1981) [in Russian].Google Scholar
  21. 21.
    K. J. Müller, “Milaculum n. g., ein phosphatisches Microfossil aus dem Altpaläozoikum,” Paläontol. Z. 473(4), 217–228 (1973).Google Scholar
  22. 22.
    M. N. Nitecki, R. C. Gutschick, and J. E. Repitski, “Phosphatic Microfossils from the Ordovician of the Unites States,” Fieldiana Geol. 35(1), 1–9 (1975).Google Scholar
  23. 23.
    Yi Qian, “Early Cambrian Small Shelly Fossils of China with Special Reference to the Precambrian-Cambrian Boundary,” in Stratigraphy and Palaeontology of Systemic Boundaries in China: Precambrian-Cambrian Boundary (Univ. Publ. House, Nanjing, 1989), No. 2.Google Scholar
  24. 24.
    Yi Qian and S. Bengtson, “Palaeontology and Biostratigraphy of the Early Cambrian Meishucunian Stage in Yunnan Province, South China,” Fossils and Strata, No. 24, 156 (1989).Google Scholar
  25. 25.
    N. P. Suvorova, “The Section of the Lower-Middle Cambrian Boundary Beds of the Yudoma and Inikan Rivers (the Eastern Siberian Platform),” in Biostratigraphy and Fauna of the Lower-Middle Cambrian Boundary Beds of Siberia (Nauka, Novosibirsk, 1983), pp. 49–55 [in Russian].Google Scholar
  26. 26.
    H. Szaniawski, “Chaetognath Grasping Spines Recognized among Cambrian Protoconodonts,” J. Paleontol. 56(3), 806–810 (1982).Google Scholar
  27. 27.
    The Cambrian System on the Siberian Platform, Ed. by J. H. Shergold, A. Yu. Rozanov, and A. R. Palmer (IUGS Publ., Trondheim, 1991).Google Scholar
  28. 28.
    H. Tong, “A Preliminary Study of the Microdictyon from the Lower Cambrian of Zhenba, South Shaanxi,” Acta Micropalaeontol. Sin. 6(1), 97–101 (1989).Google Scholar
  29. 29.
    Yang Xianhe and He Yuanxiang, “New Small Shelly Fossils from Lower Cambrian Meishucun Stage of Nanjiang Area, Northern Sichuan,” Prof. Pap. Stratigr. Palaeontol. 13, 35–47 (1984).Google Scholar

Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • Yu. E. Demidenko
    • 1
  1. 1.Paleontological InstituteRussian Academy of SciencesMoscowRussia

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