Pluralists have not sufficiently established the plausibility of the assumption that there are three distinct types of lineages under the heading 'species'.

One assumption that species pluralists make is that there are three (perhaps more) types of lineages that biologists call ‘species’. Hence when biologists refer with the word ‘species’ they refer to different types of lineages. As we saw earlier, three types of species lineages are brought to the fore by three different species concepts: (1) The Biological Species Concept and related concepts highlight those lineages bound by the process of interbreeding. (2) The Phylogenetic Species Concepts hi