Figure 2. Phyletic diagram of the West Indian alpha Anolis [modified from (6)]. The highly derived position of A. monticola is shown. An X marks each independent incident of homologous fusion that must have occurred if the karyotype of A. monticola is ancestral, that is, not the result of fission. A + marks each incident of fission according to the premises of this report. Phenacosaurus and Chamaeleolis are, respectively, primitive mainland and island anoline genera.