Paleontological Journal

, Volume 48, Issue 1, pp 74–78 | Cite as

New data on the exoskeleton of the osteostracan genus Aestiaspis (Agnatha) from the Silurian of Saaremaa Island (Estonia) and the Severnaya Zemlya Archipelago (Russia)

Article

Abstract

The histological structure of exoskeleton of the osteostracan genus Aestiaspis Janvier et Lelievre, 1994 from the Silurian of Saaremaa Island is examined for the first time. The preservation of the material enables the fine exoskeleton structure to be described in detail. The study of Aestiaspis from Saaremaa Island and the Severnaya Zemlya Archipelago has shown structural details of exoskeleton sculpture. The formation of consolidated cephalothoracic shield in the phylogeny of Tremataspidoidei is discussed. The taxonomic position of the genus Aestiaspis in the Osteostraci system is analyzed.

Keywords

Agnatha osteostracans Aestiaspis morphology Silurian Saaremaa Island Estonia Severnaya Zemlya Archipelago Russia 

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References

  1. Afanassieva, O.B., Exoskeleton features of thyestins (Agnatha), Paleontol. Zh., 1985, no. 4, pp. 70–75.Google Scholar
  2. Afanassieva, O.B., Tsefalaspidy Sovetskogo Soyuza (Agnatha) (Cephalaspids of the Soviet Union (Agnatha)), Moscow: Nauka, 1991.Google Scholar
  3. Afanassieva, O.B., On the morphology and systematic position of the tremataspid osteostracan Aestiaspis viitaensis (Agnatha), Paleontol. Zh., 1996, no. 4, pp. 68–72.Google Scholar
  4. Afanassieva, O.B., New osteostracans from the Silurian of Severnaya Zemlya Archipelago (Russia) and some problems relating to the parataxonomy of armored agnathans, Paleontol. J., 2000, vol. 34, suppl. 2, pp. 138–146.Google Scholar
  5. Afanassieva, O.B., Osteostracans (Osteostraci), in Iskopaemye pozvonochnye Rossii i sopredel’nykh stran. Beschelyustnye i drevnie ryby (Fossil vertebrates of Russia and adjacent countries: Agnathans and ancient fishes), Novitskaya, L.I. and Afanassieva, O.B., Eds., Moscow: GEOS, 2004a, pp. 210–268.Google Scholar
  6. Afanassieva, O.B., Microrelief on the exoskeleton of some early osteostracans (Agnatha): Preliminary analysis of its significance, in The Gross Symposium 2: Advances in Palaeoichthyology, Lukševičs, E., Ed., Riga, Latvia: Univ. Latviensis, 2004b, pp. 14–21.Google Scholar
  7. Afanassieva, O.B. and Karatajūtė-Talimaa, V.N., The histology of the Upper Silurian osteostracan Timanaspis kossovoii Obruchev (Agnatha) from north Timan, Russia, Acta Zool., 2009, vol. 90, suppl. 1, pp. 38–43.CrossRefGoogle Scholar
  8. Afanassieva, O.B. and Märss, T., Exoskeleton structure and distribution of Aestiaspis viitaensis (Agnatha) from the Silurian of Estonia, Paleontol. Zh., 1997, no. 6, pp. 75–80.Google Scholar
  9. Denison, R., Early Devonian fishes from Utah: Part 1. Osteostraci, Fieldiana: Geol., 1952, vol. 11, no. 6, pp. 265–287.Google Scholar
  10. Janvier, P., Norselaspis gracialis n. g., n. sp. et les relations phylogénétiques entre les Kiaeraspidiens (Osteostraci) du Dévonien inférieur du Spitsberg, Palaeovertebrata, 1981, vol. 11, nos. 2/3, pp. 19–131.Google Scholar
  11. Janvier, P., Les Céphalaspides du Spitsberg. Anatomie, phylogénie et systématique des Ostéostracés siluro-dévoniens. Révision des Ostéostracés de la Formation de Wood Bay (Dévonian inférieur du Spitsberg), Paris: Cahiers de Paléontologie CNRS, 1985.Google Scholar
  12. Janvier, P., Early Vertebrates: Oxford Monographs on Geology and Geophysics, Oxford: Clarendon Press, 1996.Google Scholar
  13. Janvier, P. and Lelievre, H., A new tremataspid osteostracan, Aestiaspis viitaensis n. g., n. sp., from the Silurian of Saaremaa, Estonia, Proc. Eston. Acad. Sci. Geol., 1994, vol. 43, no. 3, pp. 122–128.Google Scholar
  14. Kossovoi, L.S. and Obruchev, D.V., On the Lower Devonian of northern Timan, Dokl. Akad. Nauk SSSR, 1962, vol. 147, no. 5, pp. 1147–1150.Google Scholar
  15. Märss, T., Ultrasculpture pattern on the exoskeleton of lower vertebrates, in 10th International Symposium on Early Vertebrates/Lower Vertebrates, Gramado, 24–28th May 2004: Program and Abstracts, Richter, M., Ed., Gramado: Univ. Fed. Rio Grande Sul., 2004, pp. 25–26.Google Scholar
  16. Märss, T., Exoskeletal ultrasculpture of early vertebrates, J. Vertebr. Paleontol., 2006, vol. 26, no. 2, pp. 235–252.CrossRefGoogle Scholar
  17. Obruchev, D.V., Subclass Osteostraci (Cephalaspides), in Osnovy paleontologii. Beschelyustnye, ryby (Fundamentals of Paleontology: Agnathans and Fishes), Moscow: Nauka, 1964, pp. 84–107.Google Scholar
  18. Ørvig, T., Histologic studies of placoderms and fossil elasmobranchs: 1. The endoskeleton, with remarks on the hard tissues of lower vertebrates in general, Arkiv Zool., 1967, vol. 2, no. 2, pp. 321–454.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  1. 1.Borissiak Paleontological InstituteRussian Academy of SciencesMoscowRussia
  2. 2.Institute of GeologyTallinn University of TechnologyTallinnEstonia

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