Alsodes vanzolinii


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Alsodes vanzolinii
Species Authority: (Donoso-Barros, 1974)
Common Name(s):
English Vanzolini's Spiny-chest Frog
Eupsophus vanzolinii Donoso-Barros, 1974

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2ac; B2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2008-11-17
Assessor(s): Alberto Veloso, Herman Núñez, Juan Carlos Ortiz
Reviewer(s): Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson, Neil Cox and Bruce Young)
Listed as Critically Endangered because of a drastic population decline, estimated to be more than 80% over the last ten years, inferred from the apparent disappearance of most of the population and habitat; and because its Area of Occupancy is probably less than 10km2, all individuals are in a single sub-population, and the extent of its habitat on the Nahuelbuta Range is declining.
2004 Critically Endangered
1996 Data Deficient

Geographic Range [top]

Range Description: This species is endemic to the western slopes of the Nahuelbuta Range, Arauco Province (37° 59'S; 73° 22'W), Chile, at 50m asl.
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The most recent collection was of tadpoles in 2002 which were found in the only pool in the area.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species can be found in small patches of Nothofagus forest, and is not tolerant of habitat modification. It reproduces in pools within permanent streams and has free-swimming tadpoles.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): It is highly threatened by habitat destruction due to expanding pine plantations and human settlement. In the last 10 years, in particular, the range of this species has been nearly completely destroyed as a result of afforestation with pine plantations.

Conservation Actions [top]

Conservation Actions: The species is not known to occur in any protected area, and protection and maintenance of its remaining native habitat is an urgent priority. Further survey work is necessary to determine the current population status of this species and the limits of its range.

Citation: Alberto Veloso, Herman Núñez, Juan Carlos Ortiz 2010. Alsodes vanzolinii. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 30 August 2015.
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