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  Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

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Revision of Psammosteus livonicus Obruchev (Agnatha, Heterostraci) from the Devonian Amata Regional Stage of the NW of the East European Platform; pp. 1–18

(Full article in PDF format) doi: 10.3176/earth.2016.02


Authors

Vadim N. Glinskiy, Elga Mark-Kurik

Abstract

The Devonian psammosteid agnathan Psammosteus livonicus Obruchev is revised using analysis of fossil material from collections in Russia, Latvia, Lithuania and Estonia that allowed the diagnosis and description of this species to be substantially extended. Psammosteus livonicus is similar to other species of Psammosteus in the characters of the dorsal plate, cyclomorial tesserae and stenobasal shape of the branchial plates. The study of the morphology of the branchial plates and tesserae (genus-level features) with consideration of species-level features of the ornamentation proves that the establishment of the genus Oredezhosteus Moloshnikov is baseless. The species Psammolepis aerata Obruchev in Halstead Tarlo 1965 and Oredezhosteus kuleshovi Moloshnikov 2009 are included as junior synonyms into the revised species based on the ornamentation features.

Keywords

Agnatha, Heterostraci, Pteraspidiformes, Psammosteida, Late Devonian, Latvia, NW Russia.

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Current Issue: Vol. 66, Issue 4, 2017




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