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Geologija / Geology

ISSN 1392-110X
ISSN 2029-056X (online)

2006 m. Nr. 2

Discoveries: evolution of the earliest Palaeozoic vertebrates
Algimantas GRIGELIS, Susan TURNER

Researches of the Devonian and Silurian geology and palaeontology in all of Northern Eurasia performed in latest twenty years are of great importance for better understanding of evolution of the earliest Palaeozoic vertebrates. Palaeoichthyologists have discovered and described many new taxa belonging to the Thelodonti, Tesakoviaspidida, Heterostraci, Osteostraci, Monogolepidida, Chondrichthyes, and Acanthodii. Dr. Habil. Valentina Karatajūtė-Talimaa (Vilnius, Lithuania) and her colleagues took part in a large international team which compiled the Silurian and Devonian biozonation schemes based on the research data on the Palaeozoic microvertebrates. The IGCP project No. 328 Palaeozoic Microverterbrates was devoted to this work and its results were approved in 2000 by the International Devonian Stratigraphic Commission.
In the last several years V. Karatajūtė-Talimaa’s work has been devoted to the thelodonts, heterostracans and acanthodians of the Ordovician and Lower Silurian and Lower–Upper Devonian of the Russian Arctic, Severnaya Zemlya Archipelago, and Siberian Plate. The most important achievement of recent years is the detection of a new type of bone tissue and description of a new Upper Ordovician–Lower Silurian vertebrate order, Tesakoviaspidida n. ord. Karatajute-Talimaa, Smith, 2004, that was distinguished after a new type of dentinous tissue without dentine canals, and the recognition of a major group of early shark-like vertebrates, the Mongolepidida.

Keywords: palaeontology, palaeoichthyology, palaeohistology, evolution, Palaeozoic, early vertebrates, agnatha, fishes

Issues:

2011 - Vol.53
No. 1, No. 2, No. 3

2010 - Vol.52
No. 1-4

2009 - Vol.51
No. 1-2, No. 3-4

2008 - Vol.50
No. 1, No. 2, No. 3, No. 4, No. Priedas

2007
No. 1, No. 2, No. 3, No. 4

2006
No. 1, No. 2, No. 3, No. 4

2005
No. 1, No. 2, No. 3, No. 4

2004
No. 1, No. 2, No. 3, No. 4

2003
No. 1, No. 2, No. 3, No. 4

2002
No. 1, No. 2, No. 3, No. 4

2001
No. 1, No. 2, No. 3, No. 4