![]() (10) Amblyrhynchus is a monophyletic taxon diagnosed by at least 28 synapomorphies and is perhaps the most divergent iguanine from the most recent common ancestor of all of them. (9) Amblyrhynchina is a new monophyletic taxon containing the Galapagos iguanas Amblyrhynchus and Conolophus, and is diagnosed by at least 11 synapomorphies. ![]() (8) Sauromalus is a monophyletic taxon diagnosed by at least 24 synapomorphies, many of which are convergent in Amblyrhynchus. If Enyaliosaurus is separated from Ctenosaura, then Ctenosaura is not monophyletic. (7) Enyaliosaurus is monophyletic, but it is a subgroup of Ctenosaura rather than a separate taxon. (6) Ctenosaura is a monophyletic taxon diagnosed by at least three synapomorphies. (5) Within Iguanini, the relationships among four taxa-Ctenosaura, Sauromalus, Amblyrhynchina, and Iguanina-are unresolved. (4) Iguanini, containing Amblyrhynchus, Conolophus, Ctenosaura, Cyclura, Iguana, and Sauromalus, is a new monophyletic taxon diagnosed by at least three synapomorphies. (3) Brachylophus is a monophyletic taxon diagnosed by at least eight synapomorphies. ![]() (2) Dipsosaurus is a monophyletic taxon diagnosed by at least six synapomorphies. ![]() The distributions of derived characters among iguanine taxa suggest that: (1) Either Brachylophus or Dipsosaurus is the sister group of the remaining iguanines (Iguanini). Evolutionary character polarities are determined by comparison with four closely related taxa, basiliscines, crotaphytines, morunasaurs, and oplurines. Skeletal variation within Iguaninae is described and forms the basis of systematic characters used to determine phylogenetic relationships among eight basic taxa, the currency recognized iguanine genera. Iguaninae is a monophyletic taxon of tetrapodous squamates (lizards) that can be distinguished from other iguanians by at least five synapomorphies. ![]()
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