Systematics
There are now some 90 species placed in this genus; many other species formerly placed in Rana are now placed elsewhere. Rana is now restricted to the New World true frogs and the Eurasian brown and pond frogs of the common frog R. temporaria group. The validity and delimitation of the subgenera are somewhat disputed.
Genera recently split from Rana are Babina, Clinotarsus (including Nasirana), Glandirana, Hydrophylax, Hylarana, Odorrana (including Wurana), Pelophylax, Pulchrana, Sanguirana and Sylvirana. Of these, Odorrana is so closely related to Rana proper that it could conceivably be included here once again. The others seem to be far more distant relatives, in particular Pelophylax.
New species are still being described in some numbers.
Read more about this topic: Rana (genus)