Molecular data, both published and unpublished, indicates that the Coastal Tailed Frog (Ascaphus truei) consists of 4 clades south of the Columbia River.
Other anurans living today in California include the spadefoot toads (Spea, Scaphiopus; Scaphiopodidae), tailed frog (Ascaphus; Ascaphidae), true toads (Anaxyrus, Bufo, Incilius; Bufonidae), and true frogs (Lithobates, Rana; Ranidae) (Stebbins 2003; Green et al.
Studies on the postcranial morphology of Ascaphus truei.
Both assays were validated using the following target and non-target species: Northern Red-legged Frog (from northern California and British Columbia, Canada), California Red-legged Frog (from this study area and Plumas National Forest, California), Western Toad (Anaxyrus boreas), American Bullfrog (Rana catesbeiana), Foothill Yellow-legged Frog (Rana boylii), Coastal Tailed Frog (Ascaphus truei), and Pacific Treefrog (Pseudacris regilla).
Elevated genetic structure in the Coastal Tailed Frog (Ascaphus truei) in managed redwood forests.
The 1st observations of the stream-dwelling species Ascaphus truei (Coastal Tailed Frog; u = 12 adults), present in the outlet stream of the lake, were also made in 2008, 2009, 2010, and 2012 (Table 1).
Ascaphus truei were also observed during VES of the Hidden Lake outlet stream.