PRESUMED PARENTAL SPECIES (SAURIA: TEIIDAE)

Karyotypes of the parthenogenetic Cnemidophorus laredoensis and its presumed parental species Cnemidophorus gularis and Cnemidophorus sexlineatus are presented and compared. Cnemidoph- orus laredoensis is a diploid species (2n = 46) with a typical sexlineatus species group karyotype but with two pairs of heteromorphic chromosomes. C-bands of C. laredoensis show that constitutive hetero- chromatin is mostly confined to centromeric regions. The karyotypic data are consistent with the hy- pothesis that C. gularis and C. sexlineatus are the parental species of C. laredoensis.