Rana cascadae Slater, 1939

Casacdes frog

Species recognized by The Integrated Taxonomic Information System external link, T Orrell (custodian) in 
IUCN Red List Status: Near Threatened (NT) external link Showing: scientific names

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General Description

Description

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AmphibiaWeb external link
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See http://www.amphibiaweb.org/datause.html.. Some rights reserved external link
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John Romansic
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Brown to olive brown on back. Inky black spots, usually well defined, on back. Dark spotting on legs. Few or no black flecks between spots. Lower abdomen and underside of rear legs yellow, orange-yellow, or yellowish tan. Groin usually bright yellow with dark mottling. Lower sides yellowish or cream. Dorsolateral folds. Male has darkened and enlarged thumb base (Stebbins 1985). Males measure 50-60 mm in snout-vent length, females, 50-75 mm (Ronald and Dumas 1971).

Range overlaps slightly with ranges of Rana pretiosa (Spotted frog) and R. Aurora (Red-legged frog). R. pretiosa has a more conspicuous light-colored upper jaw stripe and nostrils that are set closer together an higher on the snout than R. cascadae. R. Aurora usually has red mottling on its groin and generally has smoother skin than R. cascadae (Stebbins 1985)..
 
The Cascades frog is rather non-mobile in its behavior, often allowing one to inspect it closely (Stebbins 1985).

See another account at californiaherps.com.

"Rana cascadae Slater, 1939". Encyclopedia of Life, available from "http://www.eol.org/pages/330264". Accessed 21 Mar 2010.