The form of the skull of Chamaeleo nasutus, especially the broad, trigonal parietal, is strikingly similar to the skull of Rhampholeon. This supports the hypothesis (Hillenius, 1986) that of all chameleons the group of species around Ch. nasutus is the most closely related to Rhampholeon.

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Journal Bijdragen tot de dierkunde
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Citation
Hillenius, D. (1988). The skull of Chamaeleo nasutus adds more information to the relationship of Chamaeleo with Rhampholeon and Brookesia (Chamaeleonidae, Reptilia). Bijdragen tot de dierkunde, 58(1), 7–11.