| 391ManChXVII.htm (550 words) |
 | Draw phylogenies of cichlids and their closest relatives lacking this jaw structure, and of the Beloniformes and their closest relatives lacking this jaw structure, that would support the hypothesis that this jaw structure is a key innovation. |
| For each phylogeny, use as many species is each group (cichlids, beloniforms, and their relatives) as is necessary to demonstrate whether or not the trait could be a key innovation. |
| It is hypothesized that the evolution of venom in snakes acted as a key innovation. |
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