Summary
An incipient form of tongue projection occurs inPhrynocephalus helioscopus, a generalized agamid lizard. We argue that this condition represents a functional intermediate between typical lingual prehension and chamaeleontid tongue projection, and that tongue projection evolved in chameleons by augmentation of ancestral mechanisms still operating in related, generalized lizards.
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Schwenk, K., Bell, D.A. A cryptic intermediate in the evolution of chameleon tongue projection. Experientia 44, 697–700 (1988). https://doi.org/10.1007/BF01941032
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DOI: https://doi.org/10.1007/BF01941032