How do key innovations in the animal kingdom arise? To explore this question, gecko expert Timothy Higham, Ph.D., an Associate Professor of Biology at the University of California, Riverside, led a team of evolutionary biologists to study Gonatodes, a genus of dwarf geckos. In the process, the researchers found a gecko, Gonatodes humeralis, that they suggest offers a "snapshot" into the evolution of adhesion in geckos. "The gecko adhesive apparatus, one of the most spectacular innovations displayed by vertebrates, has been intensively studied for the last 16 years and is of considerable interest to nanotechnologists and biomimeticists," Dr. Higham said. "But almost nothing is known about the origin of this adhesive capability. G. humeralis, found in South America, shows how the adhesive capabilities of geckos may have come about. Our integrative analysis of this gecko shows that, unexpectedly, it has microscopic hairs, called setae, underneath its toes, which allow it to do something dramatically different than all other geckos in the Gonatodes genus: cling to smooth surfaces such as leaves. It does this without all of the complex structure of the toes that typify the geckos that we are more familiar with. In the lab, this gecko can climb smooth vertical surfaces using its incipient adhesive system." Dr. Higham explained that the setae interact with surfaces through attractive van der Waals forces. The relatively simple expression of setae on the digits of G. humeralis thus provide an enormous advantage in sectors of the habitat typified by smooth, low-friction, inclined surfaces, such as leaves and slippery stems, allowing G. humeralis to avoid predators by occupying habitat that other members of the genus cannot. While G.
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