 However, Kripke (1980) himself argues that a person’s parentage is essential to them. If that is so, then if individual S is descended from N, then S is necessarily descended from N. McGinn (1976) suggests that this extends to species also. LaPorte (2004) argues that essentialism holds with respect to facts relating individuals, species, and other taxa to the higher taxa (genus and above) within which they are nested. These taxa are clades, that is to say kinds defined by shared descent from a common ancestral group: an individual or group that is a member or part of clade is necessarily a member or part of that clade. Thus biological kinds (species, genera, etc.) do have essential properties, and these are historical rather than intrinsic properties.