- Agnathans
- Chondrichthyes
- Osteichthyes
- Chromatophores
- Iridocytes
- Countershading
- Placoid
- Ectotherm
- Endotherm
- Cetaceans
- Baleen
- Pinnipedia
- Sirenians
- Shunting
- Lateral line
- Barbel
- Operculum
- Dorsal fin
- Pectoral fin
- Caudal fin
- Pelvic fin
- Anal fin
(source)
(source)