[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977 Order Lamniformes Berg, 1958 - mackerel sharks Family Megachasmidae Taylor, Compagno & Struhsaker, 1983 [monotypic] - megamouth sharks 1 Genus Megachasma Taylor, Compagno & Struhsaker, 1983 [monotypic]