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Paleontological Journal

, Volume 43, Issue 2, pp 153–161 | Cite as

New records of bryozoans from the Lower Ordovician of the Leningrad Region and intercolonial variability in Esthoniopora lessnikowae (Modzalevskaya)

  • A. V. Koromyslova
  • P. V. Fedorov
  • V. B. Ershova
Article

Abstract

The structure of vesicular tissue in bryozoans Esthoniopora lessnikowae (Modzalevskaya, 1953) from the Latorp Horizon (Lower Ordovician) of the Leningrad Region is studied for the first time. The intercolonial variability of this species, which is expressed in the variations in the thickness of the walls of autozooecia, shape of apertures, and the structure of vesicular tissue, is thoroughly studied. New data are used to supplement the description of the species E. lessnikowae (Modzalevskaya, 1953) and the diagnosis of the genus Esthoniopora Bassler, 1911.

Key words

new bryozoans Lower Ordovician Leningrad Region intercolonial variability 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • A. V. Koromyslova
    • 1
  • P. V. Fedorov
    • 2
  • V. B. Ershova
    • 2
  1. 1.Department of Paleontology, Geological FacultyMoscow State UniversityMoscowRussia
  2. 2.Department of Dynamic and Historical Geology, Geological FacultySt. Petersburg State UniversitySt. PetersburgRussia

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