The Ranidae or true frogs can be found in most countries except Antarctica. The true frogs can be found in North America, northern South America, Europe, Asia, Madagascar, Africa, East Indies, New Guinea, and Australia. The bullfrog is the largest true frog in North America. Usually, true frogs are smooth, moist-skinned frogs, with large, powerful legs and have webbed feet. The smallest true frogs are the Wood frog (Rana sylvatica). The largest is the Goliath frog (Conraua goliath). True frogs are semi-aquatic frogs. They live near water.

Subfamilies
Subfamilies included under Ranidae are the following. Some are sometimes treated as separate families:
Ceratobatrachinae (Malaysia, Philippines, Borneo, Papua New Guinea, Bismarck Archipelago)
Conrauinae (Africa)
Dicroglossinae
Micrixalinae (India)
Nyctibatrachinae (Western Ghats, India; Sri Lanka)
Petropedetinae (Africa)
Ptychadeninae (mainly Africa)
Raninae
Ranixalinae (India)

Genera

 Afrana
 Allopaa Ohler & Dubois, 2006
 Amietia
 Amolops
 Anhydrophryne
 Arthroleptella
 Arthroleptides
 Aubria
 Babina (sometimes included in Rana)
 Batrachylodes
 Cacosternum
 Ceratobatrachus
 Chaparana
 Chrysopaa Ohler & Dubois, 2006
 Clinotarsus Mivart 1869 (formerly in Rana, includes Nasirana)
 Conraua
 Dimorphognathus
 Discodeles
 Ericabatrachus
 Euphlyctis
 Fejervarya (formerly in Rana, paraphyletic)
 Fagayman
 Glandirana (formerly in Rana)
 Hildebrandtia
 Hoplobatrachus
 Huia (polyphyletic)
 Hylarana Tschudi 1838 (formerly in Rana)
 Indirana
 Ingerana
 Lankanectes
 Lanzarana
 Limnonectes
 Meristogenys (might belong in Huia)
 Micrixalus
 Microbatrachella
 Minervarya
 Nannophrys
 Nanorana
 Natalobatrachus
 Nothophryne
 Nyctibatrachus
 Occidozyga
 Odorrana (formerly in Rana)
 Paa
 Palmatorappia
 Pelophylax Fitzinger 1843 (formerly in Rana, probably paraphyletic)
 Petropedetes
 Phrynobatrachus
 Phrynodon
 Platymantis
 Pseudoamolops
 Poyntonia
 Pterorana
 Ptychadena
 Pyxicephalus
 Rana
 Sanguirana (formerly in Rana)
 Sphaerotheca
 Staurois
 Strongylopus
 Sylvirana
 Tomopterna

Books 

  (2007): Paraphyly of Chinese Amolops (Anura, Ranidae) and phylogenetic position of the rare Chinese frog, Amolops tormotus. Zootaxa 1531: 49–55. PDF fulltext 
  (2004): Encyclopedia of Reptiles & Amphibians (2nd ed.). Fog City Press. 
  (2006): Amphibian Species of the World Version 3 - Petropedetidae Noble, 1931. American Museum of Natural History, New York, USA. Retrieved 2006-AUG-05.
  (2006): The amphibian tree of life. Bulletin of the American Museum of Natural History. Number 297. New York.
  (1961): Osmotic Regulation in the Crab-Eating Frog (Rana cancrivora). J. Exp. Biol. 38(3): 659–678. PDF fulltext
  (2007) Constraints in naming parts of the Tree of Life. Molecular Phylogenetics and Evolution 42(2): 331–338.  PDF fulltext 
  (2005): Phylogeny of the New World true frogs (Rana). Mol. Phylogenet. Evol. 34(2): 299–314.  PDF fulltext 
  (2008): Genetic Divergences and Phylogenetic Relationships Among the Fejervarya limnocharis Complex in Thailand and Neighboring Countries Revealed by Mitochondrial and Nuclear Genes. Zoological Science 25(4): 381–390.  (HTML abstract)
  (2009): Taxonomic freedom and the role of official lists of species names. Herpetologica 65: 115-128. </small> PDF fulltext 
  (2008): The phylogenetic problem of Huia (Amphibia: Ranidae). Molecular Phylogenetics and Evolution 46(1): 49-60.  PDF fulltext

Other websites 
Amphibian and Frogs of Peninsular Malaysia - Family Ranidae 

Frogs