Syntopy between clonal complexes A and B of parthenogenetic Cnemidophorus laredoensis (Sauria : Teiidae) and both of their gonochoristic progenitors

We searched for areas: of syntopy between hybrid-derived clonal complexes A and B of Cnemidophorus laredoensis and both of their gonochoristic progeni tors, C. sexlineatus and C. gularis, in Texas and Mexico from 1983 through 2000. We discovered that all sites inhabited syntopically or separately by these two clonal complexes of lizards are contained within the vast binatio nal range of C. gularis, a widely tolerant species that is either present, or exists in neighboring plant communities, at all sites inhabited hy these parthenogenetic Forms. Conversely, the only rites of syntopy between C. la redoensis A and B and C. sexlineatus discovered during our study were clust ered in a small area of northern Webb County, Texas. The: basis for extensi ve syntopy between C. laredoensis A and B and maternal progenitor C: gulari s and limited syntopy between there parthenogenetic forms and paternal prog enitor C. sexlineatus includes components of both species-specific ecologic al adaptations and zoogeographical histories.