The phrase "entire subgenre" refers to a specific type or category within a larger genre. It means that all the different types or styles within that subgenre are being considered or represented. Full definition
Both franchises have spurred entire subgenres of games - with the best efforts adopting a more liberal, rather than direct interpretation of their source material. (tech-gaming.com)
Both franchises have spurred entire subgenres of games - with the best efforts... (tech-gaming.com)
Added to the handful of films that can truly claim the right to being the forbearer of an entire subgenre, Robert Aldrich's What Ever Happened to Baby Jane? (bloodygoodhorror.com)