AmphibiaWeb - Anaxyrus microscaphus
AMPHIBIAWEB
Anaxyrus microscaphus
Arizona Toad
family: Bufonidae

© 2007 Diego Ortiz (1 of 11)

  hear call (85.2K RM file)
  hear call (9048.2K WAV file)

[call details here]

Conservation Status (definitions)
IUCN (Red List) Status Least Concern (LC)
NatureServe Status Use NatureServe Explorer to see status.
CITES No CITES Listing
National Status None
Regional Status None
Access Conservation Needs Assessment Report.

   

 

View distribution map in BerkeleyMapper.
View Bd and Bsal data (5 records).

Description
Small to medium sized toad, with a maximum snout-vent length of 80 mm in females and 75 mm in males. These toads typically possess a pale mark on each sacral hump, and a pale bar extending across the head onto each eyelid. Mid-dorsal stripe is weak or absent. Parotoid glands are rounded. Cranial crests weak, if apparent.

Distribution and Habitat

Country distribution from AmphibiaWeb's database: United States

U.S. state distribution from AmphibiaWeb's database: Arizona, California, New Mexico, Nevada, Utah

 

View distribution map in BerkeleyMapper.
View Bd and Bsal data (5 records).
The Arizona Toad occurs in a series of isolated populations from the Mogollon plateau of southwestern New Mexico to northwestern Arizona, southern Nevada, and southwestern Utah. Preferred habitat is near permanent or intermittent shallow water flowing over sandy or rocky substrates, from desert to pine-fir forest. Increasingly common in artificial habitats such as irrigated cropland and reservoirs.

Trends and Threats
Human alteration has allowed Anaxyrus woodhousii to invade habitat previously occupied only by A. microscaphus. Studies show some indication that A. woodhousii may be replacing A. microscaphus in some drainages.

Possible reasons for amphibian decline

General habitat alteration and loss

Comments
Former subspecies A. m. californicus, which ranges from southwestern California to northern Baja, extending into the Mojave desert along the Mojave river, is now considered A. californicus. Former subspecies A. m. mexicanus is found at high elevations in the Sierra Madre Occidental of Chihuahua, Durango, and Sonora (Stebbins 2003).

See another account at californiaherps.com.

References

Price, A. H. and Sullivan, B. K. (1963). ''Bufo microscaphus.'' Catalogue of American Amphibians and Reptiles. American Society of Ichthyologists and Herpetologists, 415.1-415.3.

Stebbins, R. C. (2003). Western Reptiles and Amphibians, Third Edition. Houghton Mifflin, Boston.



Originally submitted by: April Robinson (first posted 2001-01-31)
Distribution by: Michelle S. Koo (updated 2021-06-03)
Trends and threats by: Michelle S. Koo (updated 2021-06-03)
Comments by: Michelle S. Koo (updated 2021-06-03)

Edited by: Kellie Whittaker, Michelle S. Koo (2021-06-03)

Species Account Citation: AmphibiaWeb 2021 Anaxyrus microscaphus: Arizona Toad <https://amphibiaweb.org/species/237> University of California, Berkeley, CA, USA. Accessed Sep 17, 2021.



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Citation: AmphibiaWeb. 2021. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 17 Sep 2021.

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