Morphological comparison of fourteen species of the genus Meriones Illiger, 1811 (Rodentia: Gerbillinae) from Asia and North Africa

Genus Meriones is the dominant member of gerbils in the Palaearctic region, particularly in aride region of Asia. This is also one of the most typical genus of subfamily Gerbillinae with about 17 morphospecies namely: M. persicus, M. hurrianae, M. zarudnyi M. vinogradovi, M. meridianus, M. libycus, M. crassus, M. tristrami, M. rex, M. tamariscinus, M. unguiculatus, M. shawi, M. grandis, M. sacramenti, M.dahli, M.chengi, M.arimalius. Of which first eight species have been recorded from the Iranian Plateau. There are minor differences between some species and hence, interspecific discrimination of specimens from each species is not always possible, even by polythetic methods using different taxonomic characters such as tympanic bullae, suprameatal triangle and external characters on material from museums and dental characters on archeozoological materials. Here, 26 morphological characters of 384 museum specimens belonging to 14 morphospecies of Meriones from North Africa, Iran and Central Asia were studied. This study review, 14 species of Meriones and based on the results, it seems that M.libycus, M. crassus and M. meridianus are complex species and need taxonomic revision. The cladistics analysis shows that M. vinogradovi could be forming ancestral species of genus Meriones, and west of Caspian Sea could be the center of origin for Meriones. Due to the presence of convergence regarding adaptation of different species of Meriones to similar environment, subgeneric morphological characters may cause homoplasies and paraphyletic subgenera the analysis of morphological character states matrix, using Mix program of Phylip shows different four clades that did not conform to the nominative subgenera and unveil probable homoplasy.