Atelopus onorei 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Atelopus onorei Coloma, Lötters, Duellman & Miranda-Leiva, 2007
Taxonomic Source(s): Frost, D.R. 2017. Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History, New York, USA Available at:
Taxonomic Notes: Atelopus onorei can be distinguished from other similar species by its colour patterns (Coloma et al. 2007).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) A2ace; B2ab(i,ii,iii) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Luis A. Coloma
Reviewer(s): Ariadne Angulo and Simon Stuart
Listed as Critically Endangered (Possibly Extinct) 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, perhaps due to climate change and chytridiomycosis.
Date last seen: 1990

Geographic Range [top]

Range Description:Atelopus onorei is only known from near Río Chipla (2 47' 24" S, 79 21' 36" W, ca. 2,500 m asl), 10–15 Km E Luz María, and a nearby creek, in the Azuay Basin of the Cordillera Occidental of Ecuador, Azuay Province, Ecuador (Coloma et al. 2007).
Countries occurrence:
Possibly extinct:
Ecuador (Ecuador (mainland))
Additional data:
Lower elevation limit (metres):2500
Upper elevation limit (metres):2500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Although this species was previously abundant at the type locality, no individuals have been found after 1990, despite at least four occasional search efforts to locate the species at the same site as before and surroundings (Coloma et al. 2007).
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:The species inhabits humid cloud montane forest on the Pacific versant of the Cordillera Occidental. Individuals were found close to running water, and were active during the day, with numerous pairs found in amplexus. A female was found to contain 133 ovarian eggs ca 2.14 mm in diameter. The species occurs in sympatry with A. nanay at one of the localities (Coloma et al. 2007). The species requires a permanent source of water (L. Coloma pers. comm. 2008).
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): The area of occurrence of Atelopus onorei is close is to areas where climate abnormalities have occurred and Atelopus and Telmatobius extinctions have been reported. They are also close to areas where the chytrid fungus has occurred, or its presence is predicted. Given this scenario and considering the overwhelming evidence that Atelopus has been affected by these two key factors in the highlands, it is likely that A. onorei may be extinct, although the possibility of existing relictual populations may not be overlooked (Coloma et al. 2007).

Conservation Actions [top]

Conservation Actions: This species is not known to occur in any protected areas in Ecuador.

Citation: Luis A. Coloma. 2008. Atelopus onorei. The IUCN Red List of Threatened Species 2008: e.T136173A4254841. . Downloaded on 25 June 2018.
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