What genus do reptiles belong to?

The genus of geckos is actually one specific subfamily with multiple genus's. For example. Family: Gekkonidae Subfamily: Diplodactylinae Genus: Rhacodactylus. There are multiple genus of gecko all from different subfamily's, ranging from different parts of the world. Researchers will categorize animals by specifics; Location, scale sizes, temperament, nocturnal/ diurnal dwelling, claws/ setae etc..