Earth Reptile was a title used by Silurians to refer to themselves, ignoring other terms such as "Silurian," "Eocene," and "Homo Reptilia." They refered to their Sea Devil cousins, considered a sub-species, as "Sea Devil Warriors," possibly excluding them from the title. (PROSE: The Scales of Injustice)

During the time of the Earth Empire, it was a broad term for the Silurians, Sea Devils and related species, now accepted by humanity because of their Earth-born ancestry. It was considered to be more politically correct to refer to them as such, (PROSE: Love and War) though some thought the term was offensive and the sign of an assimilationist. (PROSE: Burning Heart)