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

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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.

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Authors and Affiliations

  1. Borissiak Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ul. 123, Moscow, 117997, Russia

    O. B. Afanassieva

  2. Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn, 19086, Estonia

    T. Märss

Authors
  1. O. B. Afanassieva
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  2. T. Märss
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Correspondence to O. B. Afanassieva.

Additional information

Original Russian Text © O.B. Afanassieva, T. Märss, 2014, published in Paleontologicheskii Zhurnal, 2014, No. 1, pp. 75–79.

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Afanassieva, O.B., Märss, T. New data on the exoskeleton of the osteostracan genus Aestiaspis (Agnatha) from the Silurian of Saaremaa Island (Estonia) and the Severnaya Zemlya Archipelago (Russia). Paleontol. J. 48, 74–78 (2014). https://doi.org/10.1134/S003103011401002X

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  • DOI: https://doi.org/10.1134/S003103011401002X

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