Paleontological Journal

, Volume 51, Issue 5, pp 480–490 | Cite as

Shell microstructure of Discinisca suborbicularis sp. nov. (Brachiopoda, Lingulata) from the Upper Jurassic of Western Siberia

  • T. N. Smirnova
  • G. T. Ushatinskaya
  • E. A. Zhegallo
  • I. V. Panchenko
Article

Abstract

A new species of the phosphatic brachiopod Discinisca suborbicularis (family Discinidae) from the Upper Jurassic of Western Siberia (latitudinal Priob’e) is established. The shell microstructure under protegulum and brephic shell and the microstructure of adult shell (that corresponds to three developmental stages) are described in detail. The shell microstructure of new species considerably differs from Paleozoic discinids and is similar to Recent discinids. D. suborbicularis differs from recent discinids in the presence of protegulum and thicker organophosphatic primary layer.

Keywords

microstructure Discinoidea protegulum brephic shell Upper Jurassic southwestern Siberia 

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • T. N. Smirnova
    • 1
  • G. T. Ushatinskaya
    • 2
  • E. A. Zhegallo
    • 2
  • I. V. Panchenko
    • 1
  1. 1.Moscow State UniversityMoscowRussia
  2. 2.Borissiak Paleontological InstituteRussian Academy of SciencesMoscowRussia

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