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A list of algae, mossy, pteridophytes and gymnosperm plant species to be included into the third edition of the Red Book of the Saratov region is proposed (1 species of algae, 15 mossy species, 13 pteridophytes, 1 gymnosperms). The necessity to correct and extend the protected taxon list in comparison with the second edition is substantiated. Principles of taxon selection for the third edition are discussed.

A list of 277 flowering plant species to be included into the third edition of the Red Book of the Saratov region is proposed. The necessity to correct and extend the protected taxon list in comparison with the second edition is substantiated. Principles of taxon selection for the third edition are discussed.

Rare and disappearing species Cephalaspidomorphi and fich to be included into the third edition of Red Book of the Saratov region has been compiled on the basis of modern field surveys, collection data, analysis of literature. It contains 2 species cephalaspidomorphi and 16 species fich.

Rare and disappearing species reptiles to be included into the third edition of Red Book of the Saratov region has been compiled on the basis of modern field surveys, collection data, analysis of literature. It contains 7 herpetofauna representatives of region belonging to 3 orders and 5 families.

A list of bird species recommended for inclusion in the third edition of the Red Book of the Saratov region. Three groups stand out among the rare and protected bird species are introduced for the first time – 10; excluded –14; with the change in status – 22.

The list of species of the mammals recommended for entering into the third edition of the Red List of the Saratov region is provided. The necessity to correct and extend the protected taxon list in comparison with the second edition is substantiated.

Results of research of flora of a nature sanctuary are given in this article «the Burkinsky wood». 31 types of the protected vascular plants included in the Red book of the Saratov region are revealed. The taksonomichesky, biomorphological and ekologo-tsenotichesky analysis of rare species is carried out. Paths of use of types of a nature sanctuary are defined.