Stegocephali is a clade of four limbed vertebrates that is broadly equivalent to the term Tetrapod, although some scientists choose to restrict the term “Tetrapod” only to the last common ancestor of Amphibians and amniotes, along with all its descendants. The term was coined in 1868 by American paleontologist Edward Drinker Cope and comes from Greek στεγοκεφαλια - "roofed head", and refer to the copious amounts of dermal armor some of the larger primitive forms evidently had. In recent times, Canadian paleontologist Michel Laurin has used as a phylogenetic expression to encompass all vertebrates with toes rather than fins, i.e. tetrapods.