Fishes Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Order Lamniformes Berg, 1958 - mackerel sharks Family Megachasmidae Taylor, Compagno & Struhsaker, 1983 [monotypic] - megamouth sharks Genus Megachasma Taylor, Compagno & Struhsaker, 1983