5.
Bullock's False Toad
(Telmatobufo bullocki)
CR
Overview

Bullock’s false toad is a rare and elusive species, usually found under logs in temperate beech woodland. It breeds in fast-flowing water, where its tadpoles develop by scraping algae from rocks. Bullock’s false toad has been found hiding under logs. The stomach contents of the first individual described by scientists were examined and found to comprise the remains of cockroaches, other insects and spiders, as well as a considerable mass of plant material. This species has only been sighted twice since 1992 and, despite occurring in the Parque Nacional Nahuelbuta, a national park, is threatened by wood extraction and the establishment of pine plantations, which causes the siltation of its streams.

Urgent Conservation Actions
Further survey work is required to establish this species' population status of this species; development of a Conservation Action Plan; habitat protection.
Distribution
Arauco Province of Chile
Fact
The closest relative of the false toads is the helmeted water toad (Caudiverbera caudiverbera), which is the only other species in their family. Female helmeted water toads can be over four times the length of Bullock’s false toad. Reaching lengths of over 30 cm, they are one of the world’s largest amphibians.
Associated Blog Posts
23rd May 12
The Nahuelbuta Mountain Range is located within the northern limit of the Valdivian forest ecoregion near the coast of south-central Chile. It is conside...  Read

28th Oct 11
Trying to save one EDGE species was apparently not enough for former EDGE Fellow Claudio Soto-Azat. He has been working for a few years in conservation effor...  Read

Evolutionary Distinctiveness
Order: Anura
Family: Calyptocephalellidae
The Calyptocephalellidae family is a recently defined group of amphibians. Its four members, comprising three false toads (genus Telmatobufo) and the helmeted water toad (genus Caudiverbera) are all found in Chile, and were formerly included in the much lager Leprodactylidae family (commonly known as the “Leptodactylid frogs”). As a group, the Leptodactylidae has been reorganised recently and split into a number of different families, including the Calyptocephalellidae. It is now thought that the redefined Leptodactylidae diverged from all other amphibian groups about 60 million years ago, five milllion years after the extinction of the dinosaurs. However, it seems the Calyptocephalellidae diverged around 70 million years before the Leptodactylid frogs – 130 million years before the present day. They started to evolve separately from all other modern amphibians 30 million years prior to the extinct common ancestor that gave rise to the elephant and the mouse, when dinosaurs were still in abundance!

The false toads are a tiny and little-known genus, all members of which are endangered (Telmatobufo bullocki is Critically Endangered, Telmatobufo venustusis is Endangered, and Telmatobufo australis is Vulnerable). Their closest relative, the Vulnerable helmeted water toad, is a giant among amphibians, with females reaching lengths of over 300 mm. It feeds predominantly on other frogs and toads, although it is also capable of consuming small birds and mammals. Its huge tadpoles can grow to lengths of 15 cm and take about two years to metamorphose. The Calyptocephalellidae family is therefore a highly evolutionarily distinct, unusual and endangered group of amphibians.
Description
Bullock’s false toad is a toad-like frog, with a stocky body, long slender legs, and webbed toes. Adults have a total body length of 60-80 mm. The fingers are not webbed and the tips of all digits are pointed and not dilated into discs. The skin along the back is covered in raised, rounded glands and prominent parotoid glands are present either side of the head just behind the eyes, appearing as large, oval lumps. The ventral skin is smooth. This species is mottled greyish-brown in colour, with darker spots corresponding to the round, elevated glands along the back.
Ecology

Very little is known about this species. Since its formal discovery in 1952, it has been seen very infrequently, and there are records of just two sightings since 1992. Adults may be found hiding under logs in temperate beech forest, and it is known to breed in fast-flowing streams. The tadpoles are free-swimming and feed by scraping algae from submerged rocks.

Bullock’s false toad has been found hiding under logs. The stomach contents of the first individual described by scientists were examined and found to comprise the remains of cockroaches, other insects and spiders, as well as a considerable mass of plant material. This diet indicates that Bullock’s false toad has terrestrial (or ground-dwelling) feeding habits.

Habitat
The habitat of Bullock’s false toad is fast-flowing streams that flow through temperate Nothofagus (southern beech) forest. It can be found hiding under logs and it thought to be tolerant of moderate habitat destruction.
Distribution
This species is known from only a few locations in the Coastal Range, Nahuelbuta in the Arauco Province of Chile, between 37° and 38°S. It has an altitudinal range of 800-1,200 metres above sea level.
Population Estimate

Bullock’s false toad is extremely rare. Extensive fieldwork by several herpetologists within the range of this species between 1992 and 2002 has turned up only a single adult (in 2002). A second individual was recently seen in early 2011.

Population Trend
This species is thought to be in decline by the IUCN Red List of Threatened Species.
Status
Bullock’s false toad is listed as Critically Endangered in the IUCN Red List of Threatened Species, because its area of occupancy is probably less than 500 km sq., with all individuals in fewer than five locations, and there is a continuing decline in the extent and quality of its habitat in Arauco Province, Chile.
Threats
The major threat to the species is wood extraction from its temperate beech forest habitat and the establishment of pine plantations, which causes siltation of streams, making it difficult for the tadpoles to feed.
Conservation Underway
Bullock’s false toad occurs in the Parque Nacional Nahuelbuta, although there are no specific conservation measure ongoing for this species, and additional protection and maintenance of existing habitat is still urgently required.
Conservation Proposed
Additional survey work is required to determine the current population status of this species. All information collected should be used to develop a Conservation Action Plan for this species, addressing all relevant threats and determining the best way to conserve remaining populations. It is also important to protect existing habitat of this species against wood extraction and pine plantations. This may involve planting a buffer of native vegetation along its breeding streams to prevent siltation.

In addition to conserving native habitat for this species, the IUCN Technical Guidelines for the Management of Ex situ Populations, part of the IUCN Red List of Threatened Species, recommend that all Critically Endangered species should have an ex situ population managed to guard against the extinction of the species. An ex situ population is ideally a breeding colony of a species maintained outside of its natural habitat, giving rise to individuals from that species that are sheltered from problems associated with their situation in the wild. This can be located within the species’ range or in a foreign country that has the facilities to support a captive breeding programme for that species. Since the Bullock’s false toad is categorised as Critically Endangered, the possibility of a captive breeding programme for this species should be investigated.
Links
References
AmphibiaWeb: Information on amphibian biology and conservation [web application]. 2006. Berkeley, California: AmphibiaWeb. Available: amphibiaweb. Accessed: 08 December 2006.

Duellman, W. E. and Trueb, L. 1986. Biology of Amphibians. McGraw-Hill, New York.

Formas, J.R. 1995. Anfibios. In: J.M. Simonetti, T.K. Arroyo, A. Spotorno and E. Loz (eds), Diversidad Biológica de Chile. Comisión nacional de ciencia y tecnología (CONICYT), Santiago-Chile.

Formas, J.R., Núñez, J.J. and Brieva, L.M. 2001. Osteología, taxonomía y relaciones filogenéticas de las ranas del género Telmatobufo (Leptodactylidae). Revista Chilena de Historia Natural 74: 365-387.

Frost, Darrel R. 2006. Amphibian Species of the World: an Online Reference. Version 4 (17 August 2006). Electronic Database accessible at: . American Museum of Natural History, New York, USA.

Frost, D. R., Grant, T., Faivovich, J., Bain, R.H., Haas, A., Haddad, C. F. B., De Sá, R.O., Channing, A., Wilkinson, M., Donnellan, S.C., Raxworthy, C.J., Campbell, J.A., Blotto, B.L., Moler, P., Drewes, R.C., Nussbaum, R.A., Lynch, J.D., Green, D.M., and Wheeler, W.C. 2006. The Amphibian Tree of Life. Bulletin of the American Museum of Natural History 297: 1-370.

Glade, A. (ed.) 1993. Red List of Chilean Terrestrial vertebrates. Corporación nacional forestal (CONAF) Santiago-Chile.

Groombridge, B. (ed.) 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland.

Halliday, T. and Adler, C. (eds.). 2002. The new encyclopedia of reptiles and amphibians. Oxford University Press, Oxford.

IUCN, Conservation International and NatureServe. 2006. Global Amphibian Assessment. Global Amphibian Assessment. Accessed on 08 December 2006.

Mattison, C. 1987. Frogs and toads of the world. Blandford Press, U.K.

Núñez, J.J. and Formas, J.R. 2000. Evolutionary history of the Chilean frog genus Telmatobufo (Leptodactylidae): an immunilogical approach. Amphibia-Reptilia 21: 351-356.

Obst, F.J., Richter, K. and Jacob, U. 1984. The Completely Illustrated Atlas of Reptiles and Amphibians for the Terrarium. T.F.H. Publication Inc., N.J., U.S.A.

Roelants, K., Gower, D. J., Wilkinson, M., Loader, S. P., Biju, S. D., Guillaume, K., Moiau, L. and Bossuyt, F. 2007. Global patterns of diversification in the history of modern amphibians. Proceedings of the National Academy of Sciences 104: 887-892.

Servicio Agrícola Ganadero. 1998. Cartilla der caza. Subdepartamento de vida silvestre (DIPROREN). Imp. I. Flores Santiago de Chile.

Veloso, A. and Navarro, J. 1988. Lista Sistemática y distribución geográfica de anfibios y reptiles de Chile. Bollettino del Museo Regionale di Scienze Naturali - Torino 6(2): 481-539.

Veloso, A., Núñez, H. & Formas, R. 2004. Telmatobufo bullocki. In: IUCN 2006. 2006 IUCN Red List of Threatened Species. IUCN Red List of Threatened Species. Downloaded on 09 August 2007.

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