Novels by specie and genus
A sword and sandal
Traditionally a gladiatorial novel, but now any work that reflects the arena, featured in many SciFi books.
A horse opera
Traditionally, an American Old West setting, but now has been adopted by fantasy works as well.
Slice of Life
At one time a popular term for a gritty, realistic work that connects to the readers real life. Is less used now since this type can fall in many genres.
a particular type of fantasy where the fantasy world and the real world is express by a slight degree from each other so as to produce an illusive familiarity. Tolkien called his brand of fantasy faerie.
Edward C. Patterson