Darwin's view of the evolutionary tree is beautifully expressed in the ... intended to imply that the last common ancestor of a fish clade and a tetrapod clade was itself a fish.

Tree diagrams have been used in evolutionary biology since the time ... whereas external branches connect a tip and a node. A clade is a piece of a phylogeny that includes an ancestral lineage ...

A simplified evolutionary tree for the genus Psilocybe. Clade I and Clade II represent the Psilocybe species with the same gene order patterns within their psilocybin-producing gene clusters.

The oldest known lizard has reclaimed its crown clade. A contentious fossil has ... This involves figuring out where a species belongs in the evolutionary tree, based on the traits it shares ...