. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. February 1992 Asiatic Herpetological Research Vol. 4, p. 85. FIG. 8. Habiat of Phrynocephalus mystaceus (large sand dunes), Phrynocephalus interscapularis (sand dune edges), Phrynocephalus raddei (hard packed soil to the left) from the Kara Kum Desert 80 km north of Ashkabad (37° 57' N 58° 23' E), Turkmenistan. mystaceus and relatively poor food availability of the sand dunes could have driven the small P. interscapularis back to the dune valleys. This species, sharing a common southern origin with
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. February 1992 Asiatic Herpetological Research Vol. 4, p. 85. FIG. 8. Habiat of Phrynocephalus mystaceus (large sand dunes), Phrynocephalus interscapularis (sand dune edges), Phrynocephalus raddei (hard packed soil to the left) from the Kara Kum Desert 80 km north of Ashkabad (37° 57' N 58° 23' E), Turkmenistan. mystaceus and relatively poor food availability of the sand dunes could have driven the small P. interscapularis back to the dune valleys. This species, sharing a common southern origin with P. mystaceus, could not spread beyond the limit of the subtropical climatic belt during the next geological epoch. Its present distribution almost completely lies in the climatic zone of the continental southern Turanian region with a small penetration to the extreme southern part of the continental north Turanian region (after Alisov, 1969). These species occur were the temperature during January -3°C in the north, up to 2°C in the south and annual precipitation from 100 to 200 mm. According to Kashkarov and Korovin (1936) P. interscapularis inhabits Mediterranian deserts with a winter-spring period of precipitation and vegetation of the ephemeral type (Table 1). The relatively restricted range of P. interscapularis may be explained by some ecological peculiarities. This lizard is very small. It is not capable of digging deep into the sand, and it also has a greater tolerance to high temperatures. The temperature preference of P. interscapularis may fluctuate only 3°C, whereas in P. mystaceus it may fluctuate 4°C and in Eremias grammica up to 5°C (Cherlin and Muzicnenko, 1983). The mode of preference of temperatures in P. mystaceus and Eremias grammica is 39°C which may be comparable with the very high level of tolerance known for Dipsosaurus dorsalis. However, for P. interscapularis this index is still higher (°C). This may be considered an outstanding example o
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