[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977 Order Hexanchiformes Compagno, 1973 - six-gill sharks Family Chlamydoselachidae Garman, 1884 [monotypic] - frill sharks 1 Genus Chlamydoselachus Garman, 1884 [monotypic]