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The two complete mitochondrial genomes of endangered form of the Sevan trout Salmo ischchan aestivalis are published in this paper. The mitochondrial DNA (mtDNA) is 16,677 base pairs (bp) in length and contained 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes. The overall base composition of the genome in descending order was 29.4% – C, 27.9% – A, 26.0% – T, 16.7% – G, without a significant AT bias of 53.9%.

Here, we present the complete mitochondrial genome of the Blotched snake, Elaphe sauromates (Pallas, 1814). Mitogenome complete sequence is 17,187 bp long and consists of 13 protein-coding genes (PCGs), two rRNA genes, and 22 tRNA genes and two control regions. The species mitochondrial genome has the same gene order as other mitogenomes of Elaphe spp. Their analysed genome has base composition as: 34.8% (A), 26.8% (C), 25.7% (T), and 12.7% (G), with an A + T bias (60.5%). Presented mitogenome will provide new data for phylogenetic analysis within the genus Elaphe.

Here, we present complete mitochondrial genome of the four-lined snake, Elaphe quatuorlineata (Bonnaterre, 1790) and its comparison with closely related E. sauromates (Pallas, 1814). The complete sequence of the mitogenome is 17,183 bp long and consists of 13 protein-coding genes, two rRNA and 22 tRNA genes, and two control regions. It possesses the same gene order as other mitogenomes of Elaphe spp. and the base composition is as follows: 35.0% (A), 26.7% (C), 25.6% (T), and 12.7% (G), with an A + T bias (60.6%). The presented mitogenome will provide new data for phylogenetic analysis within phylogenetically close western Palearctic species of the genus Elaphe.

The mitochondrial genomes from two individuals of the extinct subspecies of the Sevan trout Salmo ischchan danilewskii are published in this paper. The mitochondrial DNA (mtDNA) is 16,665 base pairs (bp) in length and contained 13 protein-coding genes, 2 rRNA genes, and 22 tRNA genes. The overall base composition of the genome in descending order was 27.9% of A, 29.4% of C, 16.7% of G, and 26.0% of T without a significant AT bias of 53.9%.