Chile Darwin's frog
|Chile Darwin's frog|
|Range of Rhinoderma rufum (in red)|
The Chile Darwin's frog has a snout to vent length of about 32 mm (1.3 in). It has a fleshy proboscis, slender limbs and feet webbed between the first and second, and the second and third toes. The dorsal colour is variable but is usually some shade of brown or green, or a mixture of the two. The ventral surface is mottled in black and white.
The Chile Darwin's frog is diurnal and feeds on small insects and other invertebrates. The female lays a small clutch of eggs on moist ground. About a week later the embryos are beginning to move within the eggs and the male picks them up and stores them in his vocal sac. He keeps them there until they have developed a functioning gut and then transports them to a suitable water body and releases them. The tadpoles grow further in the water and undergo metamorphosis there. This development is in contrast to that of the Darwin's frog (Rhinoderma darwinii) tadpoles which complete their development in their parent's vocal sac.
Distribution and habitat
The Chile Darwin's frog has a very restricted range in central Chile, being found in Talca Province and southwards to Bío Bío Province, between from 33° 30'S to 37° 50'S. Very little is known about this species, but its natural habitats are probably temperate forests, rivers and swamps. It has been found in wet beech forests at altitudes of between 50 and 500 metres (160 and 1,640 ft) above sea level.
The Chile Darwin's frog is currently listed as "Critically Endangered" by the IUCN, but as there have been no confirmed sightings since around 1978, it may already be extinct. The main threats it faces are destruction of the pine forests in which it lives and building work but its steep decline is unexplained. It may be the victim of disease such as chytridiomycosis but this had not been reported in Chile when the decline started. If still extant, it is likely to be threatened by habitat loss, pollution, and infection from Batrachochytrium dendrobatidis.
On January 21, 2008, Evolutionarily Distinct and Globally Endangered (EDGE), per chief Helen Meredith identified nature's most weird, wonderful and endangered species: "The EDGE amphibians are amongst the most remarkable and unusual species on the planet and yet an alarming 85% of the top 100 are receiving little or no conservation attention." The top 10 endangered species (in the List of endangered animal species include: the Chinese giant salamander (Andrias davidianus), a distant relative of the newt, the tiny Gardiner's Seychelles frog (Sooglossus gardineri), the limbless Sagalla caecilian (Boulengerula niedeni), Table Mountain ghost frog (Heleophryne rosei), Mexican lungless salamanders, the Malagasay rainbow frog (Scaphiophryne gottlebei), Chile's Darwin frog (Rhinoderma rufum) and the Betic midwife toad (Alytes dickhilleni).
- Veloso, Alberto; Núñez, Herman; Díaz-Paéz, Helen; Formas, Ramón (2008). "Rhinoderma rufum". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 2013-12-02.
- Sears, Michael; Soto-Azat, Claudio; Valenzuela-Sánchez, Andrés; Clarke, Barry T.; Busse, Klaus; Ortiz, Juan Carlos; Barrientos, Carlos; Cunningham, Andrew A. (2013). "Is Chytridiomycosis Driving Darwin’s Frogs to Extinction?". PLoS ONE 8 (11): e79862. doi:10.1371/journal.pone.0079862. ISSN 1932-6203.
- Whittaker, Kellie; Chantasirisivisal, Peera (2008-09-08). "Rhinoderma rufum". AmphibiaWeb. Retrieved 2013-12-06.
- EDGE Amphibians: World's Weirdest Creatures Just Got Weirder by Science daily. Sciencedaily.com (January 25, 2008). Retrieved on 2013-01-02.
- Jeremy Lovell (January 20, 2008) Reuters, Giant newt, tiny frog identified as most at risk. Reuters.com. Retrieved on 2013-01-02.
- Ian Sample (January 21, 2008) guardian.co.uk, Drive to save weird and endangered amphibians. Guardian. Retrieved on 2013-01-02.
- World's weirdest amphibians. Guardian (January 21, 2008). Retrieved on 2013-01-02.
- Data related to Rhinoderma rufum at Wikispecies