Cnemidophorus tigris marmoratusBurger, 1950Aspidoscelis tigris marmorataReeder, 2002 The marbled whiptail (Aspidoscelis marmoratus) is a species of lizard found in the United States, in southern New Mexico and Texas, and in northern Mexico, in Coahuila, Chihuahua and Durango.

It is grey or black overall in color with 4 to 8 yellow or white stripes, often with dark mottling, giving it a marbled appearance.

Facultative parthenogenesis can occur in A. mamoratus haploid unfertilized oocytes by a post-meiotic mechanism resulting in genome wide homozygosity.

[1] In many species that are facultatively parthenogenetic, the transition to the completely homozygous condition results in exposure of the genetic load leading to embryonic mortality and an elevated rate of congenital malformations.

Thus, in this case, facultative parthenogenesis has the potential for allowing purifying selection to occur with the result that all lethal recessive alleles are purged in just one generation.