Atelopus arthuri Peters, 1973
In life, dorsally Atelopus arthuri is light to dark brown and dark brown pattern with heavy reticulations of orange-yellow on both body and limbs. The sides are reversed, with a dull reddish orange background and brown reticulations. The ventral surfaces of the thighs, chest, and belly have a tomato red spot surrounded by green. Some individuals have been found with a brown patch on the buttocks and a brownish spotting on the chin and throat. Soles and palms are dull orange. The pupil is black surrounded by a bright green ring and a black iris with minute green spots. In alcohol the dorsum, sides, and limbs are a light grayish brown color with some darker brown spotting or streaks. Sides also have white spots on the tips of the pustules. Some individuals have clear, colorless limbs with yellow on the first two digits and webbing. The chest, the belly, and the ventral surfaces of the thighs and humerus are light yellow color allowing transparency into the abdominal cavity. Ventral surfaces of limbs is dark brown with puncated yellow, while the hands and feet are completely yellow to brown. A large brown patch is present on the thighs below the vent extending on to the ventrum. The chin and throat are yellow with brown spotting or streaking (Peters 1973).
Individual Atelopus arthuri are noted to be very different from each other in how their colors are distributed on their body. In addition the actual patterns and colors themselves are more or less unique to each frog (Peters 1973).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Ecuador
Life History, Abundance, Activity, and Special Behaviors
Trends and Threats
While A. arthuri was protected in Bosque Protector Cashca Totoras (in Bolívar Province), it is not found in any protected areas. It has since disappeared from Cashca Totoras with some speculating that it is extinct, and thus has no conservation options. To address this speculation, additional survey work is required (Ron et al. 2004).
Possible reasons for amphibian decline
General habitat alteration and loss
Peters, J. A. (1973). ''The frog genus Atelopus in Ecuador (Anura: Bufonidae).'' Smithsonian Contributions to Zoology, 145, 1-49.
Ron, S., Coloma, L. A., Bustamante, M. R., Cisneros-Heredia, D., Yánez-Muñoz, M. 2004. Atelopus arthuri. In: IUCN 2012
Originally submitted by: Robert Tom and Ann T. Chang (first posted 2013-07-03)
Edited by: Ann T. Chang (2013-12-06)
Species Account Citation: AmphibiaWeb 2013 Atelopus arthuri <https://amphibiaweb.org/species/32> University of California, Berkeley, CA, USA. Accessed May 31, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 31 May 2023.
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