Bornean flat-headed frog
| Bornean flat-headed frog | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Amphibia |
| Order: | Anura |
| Family: | Bombinatoridae |
| Genus: | Barbourula |
| Species: | B. kalimantanensis
|
| Binomial name | |
| Barbourula kalimantanensis Iskandar, 1978
| |
| |
| Map of Borneo depicting range of Bornean flat-headed frog | |
The Bornean flat-headed frog (Barbourula kalimantanensis) is a species of frog in the family Bombinatoridae.[2] Many salamanders are lungless, and for a long time the Bornean flat-headed frog was thought to be the first frog with no lungs.[3] However, extremely tiny lungs were discovered using micro CT scanning in 2024.[4]
Djoko Iskandar, an Indonesian zoologist, first described the Bornean flat-headed frog based on a single specimen.[5] However, he did not know the frog was lungless until he was in the field with David Bickford's expedition. Bickford et al. were able to dissect some of the specimens and discovered for the first time that the frogs had no lungs. The frog breathes entirely through its skin, and its internal organs (the stomach, spleen and the liver) take up much of the space which normally would be filled by the lungs. By retaining the lunglessness of their tadpole stage, the frogs are much flatter than typical frogs, which might help absorb oxygen and avoid being swept away in fast streams.[3]
Description
[edit]This frog grows to a snout-to-vent length of 77 mm (3.0 in) for females and males are slightly smaller. It has a dorsoventrally flattened body with a broad head with a rounded snout. The limbs are robust and both hands and feet are fully webbed. The dorsal skin is smooth with small tubercles on the posterior end and the hind legs and the ventral skin is smooth. Its general colour is brown with black mottling.[6]
Distribution and habitat
[edit]This aquatic frog lives in cold, clear, and fast rivers in remote areas of the rain forests of Kalimantan, the Indonesian part of the island of Borneo. It is known from only two localities, both in the Kapuas River basin.[3]
Status
[edit]The Bornean flat-headed frog is listed as Endangered by the IUCN. It is threatened by habitat loss from severe degradation of the river habitats because of increased turbidity and toxic metals used in mining and other negative consequences of development on the island.[1][3]
See also
[edit]References
[edit]- ^ a b IUCN SSC Amphibian Specialist Group (2018). "Barbourula kalimantanensis". IUCN Red List of Threatened Species. 2018: e.T54444A3015179. doi:10.2305/IUCN.UK.2018-2.RLTS.T54444A3015179.en. Retrieved 17 November 2021.
- ^ Frost, Darrel R. (2013). "Barbourula kalimantanensis Iskandar, 1978". Amphibian Species of the World 5.6, an Online Reference. American Museum of Natural History. Retrieved 21 October 2013.
- ^ a b c d Bickford, David; Iskandar, Djoko; Barlian, Anggraini (2008). "A lungless frog discovered on Borneo". Current Biology. 18 (9): R374–R375. doi:10.1016/j.cub.2008.03.010. PMID 18424139. S2CID 1427952.
- ^ Quaglia, Sofia (2024). "Worlds only lungless frog species actually does have lungs after all". New Scientist. Retrieved 23 May 2024.
- ^ Iskandar, Djoko T. (1978). "A new species of Barbourula: first record of a discoglossid anuran in Borneo". Copeia. 1978 (4): 564–566. doi:10.2307/1443681. JSTOR 1443681.
- ^ Boisvert, Adam (2008-11-24). "Barbourula kalimantanensis". AmphibiaWeb. Retrieved 2013-12-11.
External links
[edit]- CBC: Gasp! Scientists find first lungless frog
- http://calphotos.berkeley.edu/imgs/512x768/1111_1111/1111/7442.jpeg
- [1] Science Daily article
- [2] New Scientist article
