Figure 4.

COI Neighbor-joining tree of selected vertebrate taxa. Neighbor-joining tree of selected vertebrate taxa based on the fragment of the COI gene amplified by primers LCO1490 and HCO2198. Numbers in black circles indicate major clades that were recovered by this analysis, corresponding to the numbering in Supp. material D. Only two of the clades recovered by the 16S analysis are also monophyletic here: (1) cartilaginous fishes, (8) birds.