Monophyly

Property of a group of including all taxa descendant from a common ancestral species

In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of taxa which meets these criteria:the grouping contains its own most recent common ancestor, i.e. excludes non-descendants of that common ancestor the grouping contains all the descendants of that common ancestor, without exception

This keyword could refer to multiple things. Here are some suggestions: