True frogs is the common name for the frog family Ranidae. They have the widest distribution of any frog family. They are abundant throughout most of the world, occurring on all continents except Antarctica. The true frogs are present in North America, northern South America, Europe, Africa (including Madagascar), and Asia. The Asian range extends across the East Indies to New Guinea and a single species, the Australian wood frog (Hylarana daemelii), has spread into the far north of Australia.
|Cyprus water frog (Pelophylax cypriensis)|
Typically, true frogs are smooth and moist-skinned, with large, powerful legs and extensively webbed feet. The true frogs vary greatly in size, ranging from small—such as the wood frog (Lithobates sylvatica)—to large.
Many of the true frogs are aquatic or live close to water. Most species lay their eggs in the water and go through a tadpole stage. However, as in most families of frogs, there is large variation of habitat within the family. There are also arboreal species of true frogs, and the family includes some of the very few amphibians that can live in brackish water.
The Ranidae are related to several other frog families that have Eurasian and Indian origins, including Rhacophoridae, Dicroglossidae, Nyctibatrachidae, Micrixalidae, and Ranixalidae. They are thought to be most closely related to the Indian-endemic Nyctibatrachidae, from which they diverged in the early Eocene. However, other studies recover a closer relationship with the Dicroglossidae.
It was previously thought that the Ranidae and their closest relatives were of Gondwanan origins, having evolved on Insular India during the Cretaceous. They were then entirely restricted to the Indian subcontinent until the late Eocene, when India collided with Asia, allowing the Ranidae to colonize Eurasia and eventually the rest of the world. However, more recent studies instead propose that the Ranidae originated in Eurasia, and their close relationship with India-endemic frog lineages is due to those lineages colonizing India from Eurasia during the Paleogene.
The subdivisions of the Ranidae are still a matter of dispute, although most are coming to an agreement. Several former subfamilies are now recognised as separate families (Petropedetidae, Cacosterninae, Mantellidae, and Dicroglossidae). The genus Rana has now been split up and is much reduced in size.
While too little of the vast diversity of true frogs has been subject to recent studies to say something definite, as of mid-2008, studies are going on, and several lineages are recognizable.
- The genus Staurois is probably a very ancient offshoot of the main Raninae lineage.
- Amolops has been generally delimited as a monophyletic group.
- Odorrana and Rana plus some proposed minor genera (which probably ought to be included in the latter) form another group.
- A group including Clinotarsus, Huia in the strict sense and Meristogenys
- An ill-defined assemblage of Babina, Glandirana, Hylarana, Pulchrana, Sanguirana, and Sylvirana, as well as Hydrophylax and Pelophylax, which are probably not monophyletic. Some authorities have treated them as junior synonyms of the genus Hylarana.
The following phylogeny of some genera was recovered by Che et al., 2007 using mitochondrial genes.
Most of the subfamilies formerly included under Ranidae are now treated as separate families, leaving only Raninae remaining. The following genera are recognised in the family Ranidae:
- Abavorana Oliver, Prendini, Kraus, and Raxworthy, 2015
- Amnirana Dubois, 1992
- Amolops Cope, 1865
- Babina Thompson, 1912
- Chalcorana Dubois, 1992
- Clinotarsus Mivart 1869
- Glandirana Fei, Ye, and Huang, 1990
- Huia Yang, 1991
- Humerana Dubois, 1992
- Hydrophylax Fitzinger, 1843
- Hylarana Tschudi 1838
- Indosylvirana Oliver, Prendini, Kraus, and Raxworthy, 2015
- Lithobates Fitzinger, 1843
- Meristogenys Yang, 1991
- Nidirana Dubois, 1992
- Odorrana Fei, Ye, and Huang, 1990
- Papurana Dubois, 1992
- Pelophylax Fitzinger 1843
- Pseudorana Fei, Ye, and Huang, 1990
- Pterorana Kiyasetuo and Khare, 1986
- Pulchrana Dubois, 1992
- Rana Linnaeus, 1758
- Sanguirana Dubois, 1992
- Staurois Cope, 1865
- Sumaterana Arifin, Smart, Hertwig, Smith, Iskandar, and Haas, 2018
- Sylvirana Dubois, 1992
- Wijayarana Arifin, Chan, Smart, Hertwig, Smith, Iskandar, and Haas, 2021
A number of taxa are placed in Ranidae incertae sedis, that is, their taxonomic status is too uncertain to allow more specific placement.
- "Hylarana" chitwanensis (Das, 1998)
- "Hylarana" garoensis (Boulenger, 1920)
- "Hylarana" latouchii (Boulenger, 1899)
- "Hylarana" margariana Anderson, 1879
- "Hylarana" montivaga (Smith, 1921)
- "Hylarana" persimilis (Van Kampen, 1923)
- Halipegus eccentricus, a monoecious, digenea parasitic trematode commonly found in true frogs in North America
- ^ Gordon, Malcolm S.; Schmidt-Nielsen, Knut; Kelly, Hamilton M. (1961): Osmotic Regulation in the Crab-Eating Frog (Rana cancrivora). J. Exp. Biol. 38 (3): 659–678. PDF fulltext
- ^ a b Feng, Yan-Jie; Blackburn, David C.; Liang, Dan; Hillis, David M.; Wake, David B.; Cannatella, David C.; Zhang, Peng (2017-07-18). "Phylogenomics reveals rapid, simultaneous diversification of three major clades of Gondwanan frogs at the Cretaceous–Paleogene boundary". Proceedings of the National Academy of Sciences. 114 (29): E5864–E5870. doi:10.1073/pnas.1704632114. ISSN 0027-8424. PMC 5530686. PMID 28673970.
- ^ a b Bossuyt, Franky; Brown, Rafe M.; Hillis, David M.; Cannatella, David C.; Milinkovitch, Michel C. (2006-08-01). "Phylogeny and Biogeography of a Cosmopolitan Frog Radiation: Late Cretaceous Diversification Resulted in Continent-Scale Endemism in the Family Ranidae". Systematic Biology. 55 (4): 579–594. doi:10.1080/10635150600812551. ISSN 1076-836X. PMID 16857652.
- ^ Karanth, K. Praveen (2021). "Dispersal vs. vicariance: the origin of India's extant tetrapod fauna". Frontiers of Biogeography. 13 (1). doi:10.21425/F5FBG48678. S2CID 231519470.
- ^ Cai, Hong-xia; Che, Jing; Pang, Jun-feng; Zhao, Er-mi; Zhang, Ya-ping (2007): Paraphyly of Chinese Amolops (Anura, Ranidae) and phylogenetic position of the rare Chinese frog, Amolops tormotus. Zootaxa 1531: 49–55. PDF fulltext
- ^ Kotaki, Manabu; Kurabayashi, Atsushi; Matsui, Masafumi; Khonsue, Wichase; Djong, Tjong Hon; Tandon, Manuj; Sumida, Masayuki (2008): Genetic Divergences and Phylogenetic Relationships Among the Fejervarya limnocharis Complex in Thailand and Neighboring Countries Revealed by Mitochondrial and Nuclear Genes. Zool. Sci. 25 (4): 381–390. doi:10.2108/zsj.25.381 (HTML abstract)
- ^ Stuart, Bryan L. (2008): The phylogenetic problem of Huia (Amphibia: Ranidae). Mol. Phylogenet. Evol. 46 (1): 49-60. doi:10.1016/j.ympev.2007.09.016 PDF fulltext
- ^ Amphibian Species of the World 5.5, an Online Reference. "Hylarana Tschudi, 1838". American Museum of Natural History.
- ^ Che, Jing; Pang, Junfeng; Zhao, Hui; Wu, Guan-fu; Zhao, Er-mi; Zhang, Ya-Ping (2007-04-01). "Phylogeny of Raninae (Anura: Ranidae) inferred from mitochondrial and nuclear sequences". Molecular Phylogenetics and Evolution. 43 (1): 1–13. doi:10.1016/j.ympev.2006.11.032. ISSN 1055-7903. PMID 17300963.
- Cogger, H.G.; Zweifel, R.G.; Kirschner, D. (2004): Encyclopedia of Reptiles & Amphibians (2nd ed.). Fog City Press. ISBN 1-877019-69-0
- Frost, Darrel R. (2006): Amphibian Species of the World Version 3 - Petropedetidae Noble, 1931. American Museum of Natural History, New York, USA. Retrieved 2006-AUG-05.
- Frost, Darrel R. et al. (2006): The amphibian tree of life. Bulletin of the American Museum of Natural History. Number 297. New York.
- Hillis, D.M. (2007) Constraints in naming parts of the Tree of Life. Mol. Phylogenet. Evol. 42 (2): 331–338. doi:10.1016/j.ympev.2006.08.001 PDF fulltext Archived 2011-09-27 at the Wayback Machine
- Hillis, D.M.; Wilcox, T.P. (2005): Phylogeny of the New World true frogs (Rana). Mol. Phylogenet. Evol. 34 (2): 299–314. doi:10.1016/j.ympev.2004.10.007 PDF fulltext Archived 2008-05-28 at the Wayback Machine
- Pauly, Greg B.; Hillis, David M.; Cannatella, David C. (2009): Taxonomic freedom and the role of official lists of species names. Herpetologica 65: 115-128.
- Rafinesque, C.S. (2007): "Fine del prodromo d'erpetologia siciliana ". Specchio delle Scienze, o, Giornale Enciclopedico di Sicilia 2: 102-104. (Ranidae, new family). (in Italian).