 Another version of species pluralism is found in Ereshefsky (2001). This version of pluralism adopts Hull’s conclusion that species must be spatiotemporally continuous lineages. Nevertheless, this version of pluralism asserts that there are different types of lineages called ‘species.’ The Biological Species Concept and related concepts highlight those lineages bound by the process of interbreeding. The Phylogenetic Species Concepts highlight those lineages of organisms that share a common and unique ancestry. Ecological approaches to species focus on lineages of organisms that are exposed to common sets of stabilizing selection. According to this form of species pluralism, the tree of life is segmented by different processes into different types of species lineages.