†Order Squatinactiformes †Order Protacrodontiformes †Infraclass Cladoselachimorpha †Order Cladoselachiformes †Infraclass Xenacanthimorpha †Order Xenacanthiformes †Order Ctenacanthiformes Infraclass Euselachii (sharks and rays) †Order Hybodontiformes Division Neoselachii †Order Synechodontiformes Subdivision Selachii (Selachimorpha) (modern sharks) Order Echinorhiniformes (bramble sharks) Superorder Galeomorphii Order Heterodontiformes (bullhead sharks) Order Orectolobiformes (carpet sharks) Order Lamniformes (mackerel sharks) Order Carcharhiniformes (ground sharks) Superorder Squalomorphii Order Hexanchiformes (frilled and cow sharks) Order Squaliformes (dogfish sharks) †Order Protospinaciformes Order Squatiniformes (angel sharks) Order Pristiophoriformes (sawsharks) Subdivision Batoidea (rays, skates, and sawfish) Order Torpediniformes (electric rays) Order Pristiformes (sawfishes) Order Rajiformes (skates and relatives) Order Myliobatiformes (stingrays and relatives) Incertae sedis Ptychodontidae Recent molecular studies suggest the Batoidea are not derived selachians as previously thought. Instead, skates and rays are a monophyletic superorder within Elasmobranchii that shares a common ancestor with the selachians. See also Cartilaginous versus bony fishes List of Elasmobranch cestodes, tape worms which infect sharks, rays and skates References External links Skaphandrus.com Elasmobranchii Wenlock first appearances Vertebrate subclasses Taxa named by Charles Lucien Bonaparte