. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. FIG. 5. Various views of the head of Natrix megalocephala from Lagodekhi, Georgia. Great Caucasus Ridge and then streatches along thefoothills up to the area where the Urushten and Malaya Laba rivers merge in Krasnodarsky Territory, Russia. Isolated populations are found along the southern slope of the western Caucasus in the vacinity of Lagodekhi, Georgia and Vartashen, Azerbaijan. Isolated populations are also found on the eastern slope of Adjaro-Imeretinsky Ridge, in the vicinity of Borjomi, Geo
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. FIG. 5. Various views of the head of Natrix megalocephala from Lagodekhi, Georgia. Great Caucasus Ridge and then streatches along thefoothills up to the area where the Urushten and Malaya Laba rivers merge in Krasnodarsky Territory, Russia. Isolated populations are found along the southern slope of the western Caucasus in the vacinity of Lagodekhi, Georgia and Vartashen, Azerbaijan. Isolated populations are also found on the eastern slope of Adjaro-Imeretinsky Ridge, in the vicinity of Borjomi, Georgia (Fig. 8). The species habitat is associated with the Colchida or western Transcaucasian botanico-geographical province (Kuznetsov, 1891, 1909). Distributions of isolated populations of Natrix megalocephala coincide with vegetation refugia of the Colchida type in Belo- Labinsky district, in the canyon of mid- flow of the Kura River and a number of refugia on the southern slopes of the Eastern FIG. 6. Juvenile specimen megalocephala (ZIN 19967). of Natrix Biotopic and Elevational Distribution.— In western Transcaucasia Natrix megalocephala ranges from the Black Sea slope of the Great Caucasus Ridge up to the subalpine belt. On the northern slope and in the eastern refugia this species occurs in the mountains up to 1000 m (Table 2). The biotypes of N. megalocephala are represented by forests of the Colchida type: evergreen secondary trees, Fag us orientalis, Quercus iberica, Taxus baccata, Buxus colchica, Laurocerasus officinalis, Fagetum nudum, Castanetum colchicum, Alnetum strutiopteridosum, Fageto-Abieta athirio-mixtogerbosa. More seldom Quercetum azaleosum. This snake also occurs in transformed areas such as forest edge meadows, tea plantations, and secondary hornbeam woods. Natrix megalocephala is a mesophyllic species, but unlike Natrix natrix and Natrix tesselata, it is well adapted to swift montane rivers. In case of danger, this species can hide in swift
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