. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. February 1992 Asiatic Herpetological Research Vol. 4, p. 91. FIG. 10. Pleistocene changes of Phrynocephalus. 1 to 1'- the river course of the Amu Darya River (Kelif Uzboi and Uzboi) flowing in to the Caspian Sea before the Lower Pliocene. The distribution of Phrynocephalus raddei before the change of the Amu Darya River course to the Aral Sea is hatched. The relictual populations (Upper Pliocene to present) after the change of the Amu Darya River course to the Aral Sea are depicted by cross hatchin
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. February 1992 Asiatic Herpetological Research Vol. 4, p. 91. FIG. 10. Pleistocene changes of Phrynocephalus. 1 to 1'- the river course of the Amu Darya River (Kelif Uzboi and Uzboi) flowing in to the Caspian Sea before the Lower Pliocene. The distribution of Phrynocephalus raddei before the change of the Amu Darya River course to the Aral Sea is hatched. The relictual populations (Upper Pliocene to present) after the change of the Amu Darya River course to the Aral Sea are depicted by cross hatching. A- present distribution of Phrynocephalus guttatus kushakewichi; B- the transformed distribution of Phrynocephalus rossikowi during the Upper Pleistocene from pre- Pleistocene center of speciation (B'). remaining loess and other valley originated forms of the mouth of the Murgab and Tedjen rivers, and the dry bed of the Uzboi. P. raddei boettgeri was formed in the eastern isolated part and it is possible that the western populations also present combinations of different forms (now the nominative subspecies P. raddei raddei, (Fig. 10). The genesis of the area inhabited by P. rossikowi (Figs. 11 and 12) is also correlated with the change of course of the Amu Darya River. This area decreased in the south and reached the southern coast of the Aral Sea in the north (Fig. 10). Owing to the constant change of the configuration of the Amu Darya estuary also observed now (Voskresensky, 1968). The northern part of the range of P. rossikowi was also changing repeatedly, resulting in the isolation and long existence of this isolated western population. It was described recently as a distinct subspecies, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Asiatic Herpetological Research Society; Chung-kuo liang chi p
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