Figure 1. Distribution of karyotypic variation in the family Iguanidae. The sets of numbers associated with the generic names provides a summary in the following format: the known range of 2n's in the genus / the number of species karyotyped from that genus / the total number of species in the genus (where it has been possible to determine this). An asterisk after the number of species indicates that many species in the genus appear to result from isolation on oceanic islands.