title: New speciation theories.
authors.forename: Phillip L
authors.initials: PL
authors.lastname: Engle
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003469:Culture; D055593:Geological Phenomena; D005844:Geology; D008954:Models, Biological; D017711:Nonlinear Dynamics; D010684:Philosophy; D012641:Selection, Genetic; D013045:Species Specificity