In the binomial nomenclature used worldwide, the name of an organism is composed of two parts: its genus name and a species modifier. In the game Final Fantasy XII, the bestiary also names monsters in a 2 part format: the genus and the classification, which functions as species in the game universe.
The genera of monsters in Final Fantasy XII corresponds with the monographs bought by the player, which gives additional loot dropped by a monster. The monographs are bought at a shop's bazaar as "Forgotten Grimoire".