Homologies that appeared most recently and are therefore shared by a relatively small group of closely related taxa are called:

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Shared derived features, also called synapomorphies, are homologies that appeared most recently and are shared by a relatively small group of closely related taxa. Autapomorphic features are unique to a particular taxon, shared ancestral features are homologies that are present in multiple taxa but originated in a common ancestor, and shared archetypical features are hypothetical homologies that reflect the idealized forms of a structure or function.

Homologies That Appeared Most Recently and Are Therefore Shared by a Relatively