All of the species in the family Chlamydoselachidae or common name Frilled Sharks are quite similar. They belong to the order Hexanchiformes. They are considered to be wide-ranging living species. The species that are found in the southeast Atlantic and the southwest Indian Oceans show differences from the ones found in the northwest Pacific Ocean.

In the southeast Atlantic and southwest Indian Oceans, species are found on the southern African coast. In the northwest Pacific, species are found in Japan and Taiwan.

Current research in areas of anatomical differences between the species is important in the development of more knowledge and data to help conserve the Frilled sharks. Some of these areas include the skull, vertebrae and fin structures.

Below are the two, living species belonging to the family Chlamydoselachidae or Frilled sharks.