. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. Vol. 4, p. 92 Asiatic Herpetological Research February 1992. FIG. 11. Phrynocephalus rossikowi (size x 2) from along the Amu Darya River, 30 km WNW of Deynau (39° 15' N 63° 11' E), Turkmenistan. rossikowi shammakovi. It is also possible that the extreme northeastern population has been isolated from the main distribution for a long time and represents a distinct taxonomical form. After the formation of sand ridges and the deeping of the dune valleys slowed, the process of washing away the subtle ma
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. Vol. 4, p. 92 Asiatic Herpetological Research February 1992. FIG. 11. Phrynocephalus rossikowi (size x 2) from along the Amu Darya River, 30 km WNW of Deynau (39° 15' N 63° 11' E), Turkmenistan. rossikowi shammakovi. It is also possible that the extreme northeastern population has been isolated from the main distribution for a long time and represents a distinct taxonomical form. After the formation of sand ridges and the deeping of the dune valleys slowed, the process of washing away the subtle material from the ridges to the valleys with the formation of the "takyr" landscapes began in the Pleistocene (Voskresensky, 1968). Under such new conditions P. helioscopus became widerspread in the plains of Middle Asia. The Pleistocene glaciation in Europe resulted in the sharp displacement of vegetation zones in the southern Russian plains and vegetation belts in the Caucasus Mountains. As a result, the distribution of P. mystaceus in the deserts north of the Caucasus Mountains was separated into a number of isolated parts. Its range increased in the piedmont regions north of the Caucasus Mountains to the westward, probably in the postglacial xerothermic time of the Holocene. At this time P. mystaceus reached the present border of Dagestan and Stavropolsky Territory along the Terek- Kuma rivers sands. During the Pleistocene, P. mystaceus and P. interscapularis dispersed into mountainous Kukhistan along the sands formed from the alluvial of the Amu Darya (River). Phrynocephalus sogdianus evolved as a result of the disjunction of the Kukhistan enclave during the Upper Quaternary from the continuous range of P. interscapularis. This species was described by Chernov (1959) as a subspecies, P. interscapularis sogdianus. This form was given the status of a distinct species after. Please note that these images are extracted from scanned page images that may have been digi
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