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These sharks have six or more sill slits, only one dorsal fin without any spines, and one anal fin. They are ovoviviparous.
FAMILY Chlamydoselachidae| Chlamydoselanchus anguineus | Frilled Shark |
| Heptranchias perlo | Seven-Gill Shark |
| Hexanchus griseus | Cow Shark |
| Hexanchus nakamurai | Bigeyed Six-Gill Shark |
| Notorhynchus cepedianus | Seven-Gill Shark |
