Xenopus laevis varies in size; males (45.6 to 97.5 mm) tend to be be smaller than females (57 to 147 mm). Their heads and bodies are depressed and flattened and they have small round eyes on the top of their heads. The skin is smooth and the hind limbs are long and robust. The three inner toes of the large fully webbed feet have small black claws on them. The body color is usually dark-gray to greenish-brown dorsally, and pale ventrally (Trueb 2003).
Despite the genomic revolution, the first complete genome of a frog, Xenopus tropicalis, was sequenced only in 2010. Session et al. (2016) have sequenced the genome of Xenopus laevis. Because X. tropicalis is diploid and X. laevis is tetraploid, important inferences can be made about genome evolution. Based on analysis of the rate of synonymous mutations in protein-coding genes, they estimated that the two species diverged from each other about 48 mya, a date is remarkably close to the estimate based on phylogenetic analysis of fossils, morphology, and other genomic sequences. They also calculated that the lineage of tetraploid Xenopus species originated 17–18 mya from two now extinct diploid ancestors.
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Angola, Botswana, Cameroon, Central African Republic, China, Congo, Congo, the Democratic Republic of the, Estonia, Gabon, Kenya, Lesotho, Malawi, Mozambique, Namibia, Nigeria, South Africa, Swaziland, Tanzania, United Republic of, Zambia, Zimbabwe. Introduced: Chile, France, Indonesia, Italy, Mexico, Portugal, United Kingdom, United States.
U.S. state distribution from AmphibiaWeb's database: Arizona, California, Texas
This species occurs in savannas of the Republic of South Africa, Kenya, Uganda, Democratic Republic of Congo, and Cameroon. This frog has high tolerance to change in its environment and will survive in nearly any body of water. It can be found in water bodies ranging from ice-covered lakes to desert oases. Unlike most frogs, the African clawed frog can also survive in water with high salinity (Trueb 2003).
Life History, Abundance, Activity, and Special Behaviors
These frogs spend most of their life-cycle in the water, only to leave when there is a drought. When a drought occurs, they will burrow into the drying mud. They can survive up to a year without food. Their diet consists of a wide range of animals including fish, crustaceans, insects, and other frogs. They will also scavenge on dead frogs, fish, birds, and small mammals (Trueb 2003).
Trends and Threats
Relation to Humans
This is one of the most-studied species of frogs, considered one of the model systems of developmental biology. It is hardy and breeding can be easily induced in the laboratory. Xenopus laevis early development has been studied by developmental biologists for decades and its genome has been fully sequenced. Because it makes a hardy and popular pet, it can also be found in aquariums worldwide. This species has been used as food in African countries (Trueb 2003).
This species was featured as News of the Week on 21 November 2016:
Despite the genomic revolution, the first complete genome of a frog, Xenopus tropicalis, was sequenced only in 2010. Session et al. (2016) have sequenced the genome of another species, Xenopus laevis. Because X. tropicalis is diploid and the X. laevis is tetraploid, important inferences can be made about genome evolution. Based on analysis of the rate of synonymous mutations in protein-coding genes, they estimated that the two species diverged from each other about 48 mya, a date is remarkably close to the estimate based on phylogenetic analysis of fossils, morphology, and other genomic sequences. They also calculated that the lineage of tetraploid Xenopus species originated 17–18 mya from two now extinct diploid ancestors (Written by David Cannatella).
This species was featured as News of the Week on 29 May 2017:
Often conservationists lack information critical to developing recovery strategies for endangered species. The Cape Platanna, Xenopus gilli, is restricted in distribution to a few sites in southwestern Cape, South Africa, always in sympatry with Xenopus laevis, an invasive species. Vogt et al. (2017 PeerJ) assessed niche differentiation at two sites. The diet of X. gilli is much more diverse than that of X. laevis. Both consume large numbers of tadpoles of different amphibian species (reaching as high as 45% of prey), including congeners, but X. laevis, which is about three times as common as its congener, also consumes adult X. gilli and is thus a direct predator as well as a dominant competitor. Furthermore, dietary overlap is greater between smaller members of each species. An effective conservation strategy for X. gilli is likely to require removal of X. laevis (Written by David B. Wake).
Its role as possible vector control agent was highlighted in News of the Week on 19 November 2018:
As a disease vector, it is important to control mosquito populations. However, biological control with introduced mosquitofish (Gambusia affinis) has the unintended consequence of altering ecosystems. Watters et al. (2018) explored the effectiveness of using native amphibian larvae in Missouri instead. They found that Leopard frogs (Rana sphenocephala), while consuming a large number of mosquito larvae, ate fewer mosquitos than mosquitofish. The Spotted Salamander (Ambystoma maculatum), on the other hand, consumed as much mosquitos as mosquitofish. Moreover, there was a positive relationship between mosquito consumption and salamander larvae body size providing encouragement to assess more native amphibians for mosquito control. However Thorpe et al. (2018) indicate other considerations. They found a body size-dependent response to varying prey densities. With small African Clawed frog (Xenopus laevis) tadpoles, a type II functional feeding response is shown, increasing feeding rates with prey density until a threshold when the predator cannot keep up with the prey, while larger tadpoles exhibit type III response, characterized by lower than expected feeding rates at low and high densities but increasing feeding rates at increasing intermediate densities. This suggests a need for size diversity in biological control (Written by Ann T. Chang).
Session AM, Uno Y, Kwon T, Chapman JA, Toyoda A, Takahashi S, Fukui A, Hikosaka A, Suzuki A, Kondo M, van Heeringen SJ, Quigley I, Heinz S, Ogino H, Ochi H, Hellsten U, Lyons JB, Simakov O, Putnam N, Stites J, Kuroki Y, Tanaka T, Michiue T, Watanabe M, Bogdanovic O, Lister R, Georgiou G, Paranjpe SS, van Kruijsbergen I, Shu S, Carlson J, Kinoshita T, Ohta Y, Mawaribuchi S, Jenkins J, Grimwood J, Schmutz J, Mitros T, Mozaffari SV, Suzuki Y, Haramoto Y, Yamamoto TS, Takagi C, Heald R, Miller K, Haudenschild C, Kitzman J, Nakayama T, Izutsu Y, Robert J, Fortriede J, Burns K, Lotay V, Karimi K, Yasuoka Y, Dichmann DS, Flajnik MF, Houston DW, Shendure J, DuPasquier L, Vize PD, Zorn AM, Ito M, Marcotte EM, Wallingford JB, Ito Y, Asashima M, Ueno N, Matsuda Y, Veenstra GJC, Fujiyama A, Harland RM, Taira M, & Rokhsar DS. (2016). ''Genome evolution in the allotetraploid frog Xenopus laevis. .'' Nature, 538, 336-343.
Trueb, L. (2003). ''Common platanna, Xenopus laevis.'' Grzimek's Animal Life Encyclopedia, Volume 6, Amphibians. 2nd edition. M. Hutchins, W. E. Duellman, and N. Schlager, eds., Gale Group, Farmington Hills, Michigan.
Written by Peera Chantasirivisal (Kris818 AT berkeley.edu), UC Berkeley
First submitted 2005-10-13
Edited by Kellie Whittaker, updated by David Cannatella, Sierra Raby, Michelle Koo (2018-12-23)
Species Account Citation: AmphibiaWeb 2018 Xenopus laevis: Common Plantanna <http://amphibiaweb.org/species/5255> University of California, Berkeley, CA, USA. Accessed Feb 19, 2019.
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Citation: AmphibiaWeb. 2019. <http://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 19 Feb 2019.
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