Atelopus sonsonensis 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Atelopus sonsonensis Vélez-Rodríguez & Ruíz-Carranza, 1997
Taxonomic Source(s): Frost, D.R. 2016. Amphibian Species of the World: an Online Reference. Version 6.0 (31 March 2016). New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) D ver 3.1
Year Published: 2017
Date Assessed: 2016-08-05
Assessor(s): IUCN SSC Amphibian Specialist Group
Reviewer(s): Luedtke, J.
Contributor(s): Marin, C., Molina, C., Cano, E., Castro, F. & Bolívar, W.
Facilitator/Compiler(s): Hobin, L., NatureServe
This species is known only from the type locality in the Cordillera Central of Colombia and has not been recorded since its discovery in 1996. Recent efforts directed to find the species at the type locality and nearby areas have not been successful. It is suspected that the number of mature individuals would be fewer than 50. It is therefore listed as Critically Endangered (Possibly Extinct).
Date last seen: 1996
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is only known from its type locality of Mesopotamia, near Páramo de Sonsón, in the municipality of Sonsón, Vereda Caunzal, on the eastern side of the Cordillera Central, about 15 km to the east of the municipality of Argelia, Colombia. It was recorded at 1,500 m asl, and might occur more widely. Its extent of occurrence (EOO) is 359 km2.
Countries occurrence:
Possibly extinct:
Additional data:
Lower elevation limit (metres):1500
Upper elevation limit (metres):1500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There are no recent records for this species, despite surveys at the type locality and nearby areas. It had not been recorded since its discovery in 1996. There are only 13 specimens in museum collections. In 2008, Fundación ProAves reported a rediscovery of this species, but it was a misidentification (Colombia Red List Assessment Workshop August 2016). In 2010, there were surveys to find this species but they were not successful (Colombia Red List Assessment Workshop August 2016).
Current Population Trend:Unknown
Additional data:
Number of mature individuals:0-49
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species occurs on the ground in the understorey of forest along streams; it has not been recorded from disturbed habitats. Breeding and larval development take place in streams.
Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There are no records of this species being utilized.

Threats [top]

Major Threat(s): The main threat to this species is habitat loss and degradation due to agricultural activities (including pollution from agrochemicals). The 2004 assessment reported that chytridiomycosis was probably the major threat, leading to a catastrophic population decline. While there is currently no direct information confirming that chytrid has caused declines in this species, the lack of records since the 1990s is consistent with the pattern of decline in many other montane Atelopus species, and it is therefore reasonable to infer that the disease might have been the cause of declines in this species (Colombia Red List Assessment Workshop August 2016).

Conservation Actions [top]

Conservation Actions: Conservation Actions
This species has not been recorded in any protected areas.

Conservation Needed
In view of the threat of chytridiomycosis, ex situ populations might need to be established should any further individuals be located in the wild.

Research Needed
Research is needed to better determine its distribution, population size and trends and the threats that may be affecting it.

Citation: IUCN SSC Amphibian Specialist Group. 2017. Atelopus sonsonensis. The IUCN Red List of Threatened Species 2017: e.T54553A49537963. . Downloaded on 21 May 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided