[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977 Order Pristiophoriformes Compagno, 1973 [monotypic] - saw sharks Family Pristiophoridae Bleeker, 1859 - saw sharks Genus Pliotrema Regan, 1906 [monotypic] 1 Pliotrema warreniᵀ Regan, 1906 - sixgill sawshark