Paleontological Journal

, Volume 44, Issue 10, pp 1308–1320 | Cite as

A new Bennettitalean genus from the Middle Jurassic of the Mikhailovskii Rudnik locality (Kursk Region, Russia)

Article

Abstract

Bennettitalean leaves with unusual morphology were found in the Middle Jurassic (Bathonian) deposits of Mikhailovskii Rudnik locality (Kursk Region, European Russia). This morphotype derived on the basis of Pterophyllum-like pinnate leaves by coherent coalescence of segments, through which superficial similarity of leaves of the new genus to Nilssoniopteris Nath., possessing entire leaf blade, is achieved. Each of coalescent segments was completely isolated from neighboring segments by massive cuticular wall. This character distinguishes leaves of the new genus from coherent leaves, known in other gymnosperms. The unique preservation type characteristic of plant remains of the Mikhailovskii Rudnik locality, allowed us to study some details of anatomical structure of leaf segments in the new genus. In particular, it was established, that palisade mesophyll in segments was poorly developed, and metaxylem in vascular bundles comprises tracheids with scalariform to circular bordered pits.

Key words

Middle Jurassic Bathonian gymnosperms Bennettitales morphology anatomy systematics 

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References

  1. 1.
    M. P. Doludenko and Ts. I. Svanidze, Late Jurassic Flora of Georgia (Nauka, Moscow, 1969) [in Russian].Google Scholar
  2. 2.
    B. L. Dower, R. L. Bateman, and D. W. Stevenson, “Systematics, Ontogeny, and Phylogenetic Implications of Exceptional Anatomically Preserved Cycadophyte Leaves from the Middle Jurassic of Bearreraig Bay, Skye, Northwest Scotland,” Bot. Rev. 70(2), 105–120 (2004).CrossRefGoogle Scholar
  3. 3.
    N. V. Gordenko, “New Data on the Middle Jurassic Flora of the Mikhailovskii Rudnik Locality (Kursk Region),” in Questions of Paleofloristics and Systematics of Fossil Plants (Lectures in Commemoration of A.N. Kryshtofovich, Vol. 6.), Ed. by L. Yu. Budantsev (Komarov Bot. Inst. Ross. Akad. Nauk, St. Petersburg, 2008), pp. 61–64 [in Russian].Google Scholar
  4. 4.
    T. M. Harris, The Yorkshire Jurassic Flora, III (Brit. Mus. (Nat. Hist.), London, 1969).Google Scholar
  5. 5.
    T. M. Harris, The Strange Bennettitales (Birbal Sahni Inst. Palaeobot., Lucknow, 1973).Google Scholar
  6. 6.
    S. V. Meyen, Fundamentals of Palaeobotany (Chapman and Hall, London-New York, 1987).Google Scholar
  7. 7.
    T. Ohana and T. Kimura, “Permineralized Otozamites Leaves (Bennettitales) from the Upper Cretaceous of Hokkaido, Japan,” Transact. Proc. Palaeontol. Soc. Japan, New Ser., No. 164, 944–963 (1991).Google Scholar
  8. 8.
    H.-J. Schweitzer and M. Kirchner, “Die rhäto-jurassischen Floren des Iran und Afghanistans: 13. Cycadophyta III. Bennettitales,” Palaeontogr. Abt. B 264, 1–166 (2003).Google Scholar
  9. 9.
    J. Watson and C. A. Sincock, “Bennettitales of the English Wealden,” Monogr. Palaeontogr. Soc. Lond. 588, 1–228 (1992).Google Scholar
  10. 10.
    S. Wu, “Upper Triassic Plants from Sichuan,” Bull. Nanjing Inst. Geol. Paleontol., Acad. Sin. 14, 70–157 (1998).Google Scholar
  11. 11.
    T. Yamada, J. Legrand, and H. Nishida, “Structurally Preserved Nilssoniopteris from the Arida Formation (Barremian, Lower Cretaceous) of Southwest Japan,” Rev. Palaeobot. Palynol. 156(3), 410–417 (2009).CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  1. 1.Borissiak Paleontological Institute of the Russian Academy of SciencesMoscowRussia

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