Figure 3.
Summary table showing the evolution of all opsin classes in gnathostome vertebrates (teleosts to eutherians), where many opsins present in some classes (yes [Y]) were lost in others (no [N]), especially at the base of the mammalian lineage. For further information relating to opsin class subdivision into six main groups, see Figure 2: (1) visual opsins (green), (2) cone-like nonvisual opsins (blue), (3) opn3/tmt opsins (purple), (4) rgr/rrh/opn5 opsins (yellow), (5) opn4 opsins (black), and (6) the new opsins (red).
