The major hypotheses of the basal hexapod relationships proposed in recent studies. (A) Traditional view based on morphology [20,49]. (B) Based on mitogenomic data [22,23]. (C) Based on fossil data , comparative embryological evidence [33,34], morphological data [28,35], and some molecular sequences (EF-1α, EF-2, and RAN polymerase II) . (D) Based on nuclear molecular data [7,8,29,30,37].
Sasaki et al. BMC Evolutionary Biology 2013 13:236 doi:10.1186/1471-2148-13-236