Rocky Mountain Tailed Frog - Ascaphus montanus
Adults are gray or brown with gray, brown, or occasionally yellow blotches; the skin has a distinctly bumpy texture. Adult body length is 1.5 to 2 inches. The outer toe of the hind foot is broader than the other toes. Tailed frogs have no external ear drum. The male has a bulbous "tail" that acts as a penis. Eggs and Tadpoles: Approximately 50 eggs are laid in rosary-like strings attached to the underside of rocks. The tadpole (up to 2 inches long) is unique in that it has a large mouth modified into a sucker; color is variable.
No other frog or toad has the outer toe of the hind foot broader than the other toes; all other frogs and toads have external ear drums.
Western Hemisphere Range
Summary of Observations Submitted for Montana
Number of Observations:
(Click on the following maps and charts to see full sized version)
Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Non-migratory. Has no breeding migration (Daugherty 1982).
Rocky Mountain Tailed Frogs are found in and along small, swift, cold mountain streams. Eggs are laid during late summer and take approximately 4 weeks to hatch. Tadpoles take 1 to 4 years to metamorphose, depending on water temperature. Sexual maturity in Montana is attained at 6 or 7 years of age (the latest of any North American amphibian). Forested streams. In Flathead area, larvae are found only in streams with temperature under 16 C. Prefer fast streams, less than 14 ft wide, with substrate of slabby-flat bottomed rocks with little aquatic vegetation (Franz and Lee 1970).
Ecological Systems Associated with this Species
- Details on Creation and Suggested Uses and Limitations
How Associations Were Made
We associated the use and habitat quality (high, medium, or low) of each of the 82 ecological systems mapped in Montana for
vertebrate animal species that regularly breed, overwinter, or migrate through the state by:
- Using personal observations and reviewing literature that summarize the breeding, overwintering, or migratory habitat requirements of each species (Dobkin 1992, Hart et al. 1998, Hutto and Young 1999, Maxell 2000, Foresman 2001, Adams 2003, and Werner et al. 2004);
- Evaluating structural characteristics and distribution of each ecological system relative to the species’ range and habitat requirements;
- Examining the observation records for each species in the state-wide point database associated with each ecological system;
- Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of “observations versus availability of habitat”.
Species that breed in Montana were only evaluated for breeding habitat use, species that only overwinter in Montana were only evaluated for overwintering habitat use, and species that only migrate through Montana were only evaluated for migratory habitat use.
In general, species were associated as using an ecological system if structural characteristics of used habitat documented in the literature were present in the ecological system or large numbers of point observations were associated with the ecological system.
However, species were not associated with an ecological system if there was no support in the literature for use of structural characteristics in an ecological system, even if
point observations were associated with that system.
High, medium, and low habitat quality was assigned based on the degree to which the structural characteristics of an ecological system matched the preferred structural habitat characteristics for each species in the literature.
The percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system was also used to guide assignments of habitat quality.
If you have any questions or comments on species associations with ecological systems, please contact Bryce Maxell at firstname.lastname@example.org
or (406) 444-3655.
Suggested Uses and Limitations
Species associations with ecological systems should be used to generate potential lists of species that may occupy broader landscapes for the purposes of landscape-level planning.
These potential lists of species should not be used in place of documented occurrences of species (this information can be requested at: http://mtnhp.org/requests/default.asp
) or systematic surveys for species and evaluations of habitat at a local site level by trained biologists.
Users of this information should be aware that the land cover data used to generate species associations is based on imagery from the late 1990s and early 2000s and was only intended to be used at broader landscape scales.
Land cover mapping accuracy is particularly problematic when the systems occur as small patches or where the land cover types have been altered over the past decade.
Thus, particular caution should be used when using the associations in assessments of smaller areas (e.g., evaluations of public land survey sections).
Finally, although a species may be associated with a particular ecological system within its known geographic range, portions of that ecological system may occur outside of the species’ known geographic range.
- Adams, R.A. 2003. Bats of the Rocky Mountain West; natural history, ecology, and conservation. Boulder, CO: University Press of Colorado. 289 p.
- Dobkin, D. S. 1992. Neotropical migrant land birds in the Northern Rockies and Great Plains. USDA Forest Service, Northern Region. Publication No. R1-93-34. Missoula, MT.
- Foresman, K.R. 2001. The wild mammals of Montana. Special Publication No. 12. Lawrence, KS: The American Society of Mammalogists. 278 p.
- Hart, M.M., W.A. Williams, P.C. Thornton, K.P. McLaughlin, C.M. Tobalske, B.A. Maxell, D.P. Hendricks, C.R. Peterson, and R.L. Redmond. 1998. Montana atlas of terrestrial vertebrates. Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT. 1302 p.
- Hutto, R.L. and J.S. Young. 1999. Habitat relationships of landbirds in the Northern Region, USDA Forest Service, Rocky Mountain Research Station RMRS-GTR-32. 72 p.
- Maxell, B.A. 2000. Management of Montana’s amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species. Report to U.S. Forest Service Region 1. Missoula, MT: Wildlife Biology Program, University of Montana. 161 p.
- Werner, J.K., B.A. Maxell, P. Hendricks, and D. Flath. 2004. Amphibians and reptiles of Montana. Missoula, MT: Mountain Press Publishing Company. 262 p.
- Commonly Associated with these Ecological Systems
Forest and Woodland Systems
Shrubland, Steppe and Savanna Systems
Wetland and Riparian Systems
- Occasionally Associated with these Ecological Systems
Forest and Woodland Systems
Wetland and Riparian Systems
Larva feed almost exclusively on diatoms, though also pollen (Metter 1964, Franz 1970) Adults: opportunistic; forage at night in forest near streams. Prey on invertebrates, mainly terrestrial but also aquatic forms (Metter 1964, Bury 1970, Daugherty 1982).
Low reproductive potential: reproductive maturity age 7 to 8; 2 year cycle with first clutch at age 9 (Daugherty 1982). Extremely philopatric; probably very little gene flow between populations (Daugherty 1982).
Mate August to September; sperm stored overwinter (Metter 1964). Ovipost late June to July; hatch August to September but remain in nest (under rocks in stream) until yolk is consumed, October to November or later. Metamorphose July to September of year 4 (ca. 60 days required) (Daugherty 1979). Development of eggs under natural conditions is discussed by Franz (1970).
- Literature Cited AboveLegend: View Online Publication
- Bury, R.B. 1970. Food similarities in the tailed frog, Ascaphus truei, and the Olympic salamander, Rhyacotriton olympicus. Copeia 1970: 170-171.
- Daugherty, C.H. and A.L. Sheldon. 1982a. Age-determination, growth, and life history of a Montana population of the tailed frog Ascaphus truei. Herpetologica 38(4): 461-468.
- Franz, R. and D.S. Lee. 1970. The ecological and biogeographical distribution of the tailed frog, Ascaphus truei, in the Flathead River drainage of northwestern Montana. Bulletin of the Maryland Herpetological Society 6: 62-73.
- Metter, D.E. 1964a. A morphological and ecological comparison of two populations of the tailed frog Ascaphus truei Stejneger. Copeia 1964: 181-195.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- [NDTI] Northrop, Devine, and Tarbell Incorporated. 1994. Cabinet Gorge and Noxon Rapids hydroelectric developments 1993 wildlife study. Northrop, Devine, and Tarbell Incorporated, Portland, ME. 197 p.
- [USFWS] US Fish and Wildlife Service. 1994. Endangered and threatened wildlife and plants; animal candidate review for listing as endangered or threatened species. Federal Register 59(219): 58982-59028.
- Adams, M.J. 1993. Summer nests of the tailed frog (Ascaphus truei) from the Oregon coast range. Northwestern Naturalist 74: 15-18.
- Adams, S. 1998. Tailed frog migration: a local response to seasonally unsuitable habitat? Abstract. Montana Chapter of the American Fisheries Society Meeting. Helena, MT. February 2-5, 1998.
- Adams, S. and C.A. Frissell. 2001. Thermal habitat use and evidence of seasonal migration by Rocky Mountain tailed frogs, Ascaphus montanus, in Montana. Canadian Field Naturalist 115(2): 251-256.
- Altig, R. 1969. Notes on the ontogeny of the osseous cranium of Ascaphus truei. Herpetelogica 25:59-62.
- Altig, R., and E.E. Brodie. 1972. Laboratory behavior of Ascaphus truei tadpoles. Journal of Herpetology 6: 21-24.
- Black, J.H. and J.N. Black. 1968. Frog with a tail. Montana Outdoors 3(3): 3 p.
- Black, J.H. and R. Timken. 1976. Endangered and threatened amphibians and reptiles in Montana. p 36–37. In R.E. Ashton, Jr. (chair). Endangered and threatened amphibians and reptiles in the United States. Society for the Study of Amphibians and Reptiles Herpetological Circular 5: 1-65.
- Blaustein, A.R., J.J. Beatty, H. Deanna, and R.M. Storm. 1995. The biology of amphibians and reptiles in old-growth forests in the Pacific Northwest. General Technical Report PNW-GTR-337. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 98 p.
- Bogart, J.P., E.K. Balon, and M.N. Bruton. 1994. The chromosomes of the living coelacanth and their remarkable similarity to those of one of the most ancient frogs. Journal of Heredity 85(4): 322-325.
- Boundy, J. 2001. Herpetofaunal surveys in the Clark Fork Valley region, Montana. Herpetological Natural History 8: 15-26.
- Brown, H.A. 1975b. Temperature and development of the tailed frog (Ascaphus truei). Comparative Biochemistry and Physiology 50A: 397-405.
- Brown, H.A. 1989a. Developmental anatomy of the tailed frog (Ascaphus truei): a primitive frog with large eggs and slow development. Journal of Zoology London 217: 525-537.
- Brown, H.A. 1990a. Morphological variation and age-class determination in overwintering tadpoles of the tailed frog, Ascaphus truei. Journal of Zoology 220: 171-184.
- Brown, H.A. 1990b. Temperature, thyroxine, and induced metamorphosis in tadpoles of a primitive frog, Ascaphus truei. General and Comparative Endocrinology 79(1): 136-146.
- Brunson, R.B. 1955. Check list of the amphibians and reptiles of Montana. Proceedings of the Montana Academy of Sciences 15: 27-29.
- Brunson, R.B. and H.A. Demaree, Jr. 1951. The herpetology of the Mission Mountains, Montana. Copeia (4):306-308.
- Bull, E.L. and B.E. Carter. 1996a. Tailed frogs: distribution, ecology, and association with timber harvest in northeastern Oregon. USDA Forest Service, Research Paper PNW-RP-497, Portland, Oregon. 17p.
- Bull, E.L. and B.E. Carter. 1996b. Winter observations of tailed frogs in northeastern Oregon. Northwestern Naturalist 77: 45-47.
- Burkholder, L.L. 2003. Seasonal activity patterns and life history characteristics of post-metamorphic tailed frogs in north coastal California. Abstract. Northwestern Naturalist 84:96.
- Bury, R.B. 1968. The distribution of Ascaphus truei in California. Herpetologica 24(1): 39-46.
- Bury, R.B. and M.J. Adams. 1999. Variation in age at metamorphosis across a latitudinal gradient for the tailed frog (Ascaphus truei). Herpetologica 55(2): 283-291.
- Bury, R.B., G.M. Fellers, and S.B. Ruth. 1969. First records of Plethodon dunni in California, and new distributional data on Ascaphus truei, Rhyacotriton olympicus, and Hydromantes shastae. Journal of Herpetology 3: 157-161.
- Bury, R.B., P. Loafman, D. Rofkar, and K.I. Mike. 2001. Clutch sizes and nests of tailed frogs from the Olympic Peninsula, Washington. Northwest Science 75(4): 419-422.
- Carlson, J. (Coordinator, Montana Animal Species of Concern Committee). 2003. Montana Animal Species of Concern. Helena, MT: Montana Natural Heritage Program and Montana Fish, Wildlife, and Parks. In Press. 12p.
- Cavallo, B.J. 1997. Floodplain habitat heterogeneity and the distribution, abundance, and behavior of fishes and amphibians in the Middle Fork Flathead River Basin, Montana. M.S. Thesis. University of Montana, Missoula, MT. 133 p.
- Clancy, C.G. 1996. Statewide fisheries investigations, Bitterroot Forest inventory July 1, 1995 to June 30, 1996. Job completion report. Montana Department of Fish, Wildlife and Parks, Fisheries Division. 97 p.
- Claussen, D.L. 1971. A comparative study of the thermal and water relations of the tailed frog, Ascaphus truei and the Pacific treefrog, Hyla regilla. Ph.D. Dissertation. University of Montana, Missoula, MT. 103 p.
- Claussen, D.L. 1973a. The thermal relations of the tailed frog (Ascaphus truei) and the Pacific treefrog (Hyla regilla). Comparative Biochemistry and Physiology 44a: 137-153.
- Claussen, D.L. 1973b. The water relations of the tailed frog (Ascaphus truei) and the Pacific treefrog (Hyla regilla). Comparative Biochemistry and Physiology 44a: 155-171.
- Cochran, D.C. 1961. Type specimens of reptiles and amphibians in the United States National Museum. U.S. National Museum Bulletin (220) xv + 291pp.
- Corbit, C.D. 1960. Range extensions of Ascaphus truei in Idaho. Copeia 1960: 240.
- Corn, P.S. and R.B. Bury. 1989. Logging in western Oregon: responses of headwater habitats and stream amphibians. For. Ecol. and Manage. 29:39-57.
- Crother, B.I. (ed.) 2008. Scientific and standard English names of amphibians and reptiles of North America north of Mexico. SSAR Herpetological Circular No. 37:1-84.
- Daugherty, C.H. 1976. Freeze-branding as a technique for marking anurans. Copeia 1976: 836-838.
- Daugherty, C.H. 1979. Population ecology and genetics of Ascaphus truei: an examination of gene flow and natural selection. Ph.D. dissertation, University of Montana. Missoula, MT. 143 pp.
- Daugherty, C.H. and A.L. Sheldon. 1982. Age specific movement patterns of the frog Ascaphus truei. Herpetologica 38(4):468-474.
- Daugherty, C.H. and F.W. Allendorf. 1977a. Divergence of populations: preliminary evidence relating to the Ehrlich-Raven hypothesis from Ascaphus truei. Abstract. Annual Report Issue of the Genetics Society of America 86(2): S14.
- Daugherty, C.H. and F.W. Allendorf. 1977b. The taxonomic value of genetic distance: data from two amphibians. Abstract. American Zoologist 17(4): 973.
- Daugherty, C.H. and F.W. Allendorf. 1979. Temporal genetic stability in a population of the tailed frog, Ascaphus truei. Abstract. American Zoologist 19(3): 962.
- Daugherty, C.H., L.N. Wishard, and L.B. Daugherty. 1978. Sexual dimorphism in an anuran response to severe thermal stress. Journal of Herpetology 12(3): 431-432.
- De Vlaming, V.L., and R.B. Bury. 1970. Thermal selection in tadpoles of the tailed frog, Ascaphus truei. Journal of Herpetology 4: 179-189.
- Diller, L.V. and R.L. Wallace. 1999. Distribution and habitat of Ascaphus truei in streams on managed, young growth forests in north coastal California. Journal of Herpetology 33(1): 71-79.
- Donaldson, L.R. 1934. The occurrence of Ascaphus truei east of the Continental Divide. Copeia 1934(4): 184.
- Dupuis, L.A. and D. Steventon. 1999. Riparian management and the tailed frog in northern coastal forests. Journal of Forest Ecology and Management 124(1): 35-43.
- Dupuis, L.A. and F.L.Bunnell. 1999. Status and distribution of the tailed frog in British Columbia. A report for Forest Renewal British Columbia, Victoria, British Columbia.
- Dupuis, L.A. and P. Friele. 2004. River continuum concept and management efforts--The case of the tailed frog. Abstract. Northwestern Naturalist 85:73.
- Dupuis, L.A., F.L.Bunnell,and P.A. Friele. 2000. Determinants of the tailed frog's range in British Columbia, Canada. Northwest Science 74(2): 109-115.
- Enk, M. 1999. Preliminary results of amphibian monitoring on the Lewis and Clark National Forest. Intermountain Journal of Sciences 5(1-4): 48.
- Farmer, P. and S.B. Heath. 1987. Wildlife baseline inventory, Rock Creek study area, Sanders County, Montana. Western Technology and Engineering, Inc. Helena, MT.
- Feminella, J.W. and C.P. Hawkins. 1994. Tailed frog tadpoles differentially alter their feeding behavior in response to non-visual cues from four predators. Journal of the North American Benthological Society 13: 310-320.
- Flath, D.L. 1998. Species of special interest or concern. Montana Department of Fish, Widlife and Parks, Helena, MT. March, 1998. 7 p.
- Flath, Dennis L., 1979, Nongame species of special interest or concern: Mammals, birds, reptiles, amphibians, fishes. January 1979.
- Fraley, J. 2001. Frog with a tail. Montana Outdoors 32(2): 21-22.
- Franz, R. 1970. Egg development of the tailed frog under natural conditions. Bulletin of the Maryland Herpetological Society 6(2): 27-30.
- Franz, R. 1970b. Food of larval tailed frogs. Bulletin of the Maryland Herpetological Society 6: 49-51.
- Franz, R. 1971. Notes on the distribution and ecology of the herpetofauna of northwestern Montana. Bulletin of the Maryland Herpetological Society 7: 1-10.
- Fritzsch, B., R.C. Drewes and R. Ruibal. The retention of the lateral-line nucleus in adult anurans. Copeia 1987: 127-135.
- Gaige, H.T. 1920. Observations upon the habitats of Ascaphus truei Stejneger. Occassional Papers of the University of Michigan Museum of Zoology 84: 1-9, pl. 1.
- Genter, D.L., A.G. Wilson, and E.M. Simon. 1988. Supplementary report on the status of the Coeur d' Alene salamander (Plethodon idahoensis) in northwestern Montana. Report of Montana Natural Heritage Program, Helena.
- Gradwell, N. 1971. Ascaphus tadpole: experiments on the suction and gill irrigation mechanisms. Canadian Journal of Zoology 49: 307-332.
- Gradwell, N. 1973. On the functional morphology of suction and gill irrigation in the tadpole of Ascaphus, and notes on hibernation. Herpetologica 29: 84-93.
- Gray, L.A. 1992a. Age determination and age at metamorphosis of the tailed frog, Ascaphus truei. Northwest Science 66(2): 115.
- Gray, L.A. 1992b. Larval growth and age at completion of metamorphosis of the tailed frog, (Ascaphus truei). Ellensburg, WA: Central Washington University. 62p. M.S. Thesis.
- Green, D.M., C.H. Daugherty, and J.P. Bogart. 1980. Karyology and systematic relationships of the tailed frog (Ascaphus truei). Herpetologica 36: 346-352.
- Green, D.M., T.F. Sharbel, R.A. Hitchmough and C.H. Daugherty. 1989. Genetic variation in the genus Leiopelma and relationships to other primitive frogs. Zeitschrift Fuer Zoologische Systematik und Evolutionforschung 27(1): 65-79.
- Hailman, J.P. 1982. Extremely low ambient light levels of Ascaphus truei. Journal of Herpetology 16: 83-84
- Hailman, J.P. and R.G. Jaeger. 1974. Phototactic responses to spectrally dominant stimuli and use of colour vision by adult anuran amphibians: a comparative survey. Animal Behavior 22: 757-795
- Hailman, J.P. and R.G. Jaeger. 1978. Photactic responses of anuran amphibians to monochromatic stimuli of equal quantum intensity. Animal Behavior 26: 274-281
- Hansen, B.P., D.H. Olson, and C.D. Moyer. 2000. Demographics and age at metamorphosis of larval tailed frogs, Ascaphus truei, in a coastal Oregon stream. Northwestern Naturalist 81(2):75.
- Hawkins, C.P. and J.R. Sedell. 1990. The role of refugia in the recolonization of streams devastated by the 1980 eruption of Mount St. Helens. Northwest Science 64(5): 271-274.
- Hawkins, C.P., J. Feminella and C.M. Crissafulli. 1994. Patterns of abundance and growth of tailed frog populations near the Mt. St. Helens blast Zone. Northwest Science 68(2): 129.
- Hawkins, C.P., L.J. Gottschalk, and S.S. Brown. 1988. Densities and habitat of tailed frog tadpoles in small streams near Mt. St. Helens following the 1980 eruption. Journal of the North American Benthological Society 7: 246-252.
- Hayes, M.P., D.J. Dugger, T.L. Hicks, and T. Quinn. 2003b. Headwater habitat variation: Its relationship to stream amphibian distribution. Abstract. Northwestern Naturalist 84:100.
- Hayes, M.P., T. Quinn, D.E. Runde, L.L.C. Jones, M.G. Raphael, and T. Hicks. 2002. Is the Olympic tailed frog (Ascaphus truei) a biodiversity indicator? Northwestern Naturalist 83(2):71.
- Hazelwood, W.G. 1993. Extending the known range of tailed frog populations in British Columbia. Unpublished report. Alpenglow Resources, Terrace, British Columbia.
- Held, S.P. 1984. Captive maintenance of the tailed frog (Ascaphus truei) at the Washington Park Zoo, Portland Oregon. Animal Keepers’ Forum 11(12): 402-410.
- Held, S.P. 1985. Maintenance, exhibition, and breeding of the tailed frog, Ascaphus truei, in a zoological park. Herpetological Review 16(2): 48-51.
- Hendricks, P. 1997. Lee Metcalf National Wildlife Refuge preliminary amphibian and reptile investigations: 1996. Montana Natural Heritage Program, Helena, MT. 21 p.
- Hendricks, P. and J. D. Reichel. 1996. Amphibian and reptile survey of the Bitterroot National Forest: 1995. Montana Natural Heritage Program. Helena, MT. 95 p.
- Hossack, B.R. 2006. Amphibians and wildfire in the U.S. Northwest. International Journal of Wilderness 12(1):26.
- Hossack, B.R. and P.S. Corn. 2005. Changes in counts of Rocky Mountain tailed frog tadpoles after wildfires in Glacier National Park, Montana. Abstract. Northwestern Naturalist 86:99.
- Jaeger, R.G. and Hailman, J.P. 1973. Effects of intensity on the phototactic responses of adult anuran amphibians: a comparative survey. Zoological Tierpsychology 33: 352-407.
- Jamieson, B.G.M., M.S.Y. Lee and K. Long. 1993. Ultrastructure of the spermatozoon of the internally fertilizing frog Ascaphus truei (Ascaphidae: Anura: Amphibia) with phylogenetic considerations. Herpetologica 49(1): 52-65.
- Jones L.C. and M.G. Raphael. 1998. Ascaphus truei (Tailed frog). Predation. Herpetological Review 29: 39.
- Jones, J.L., C.R. Peterson, and C.V. Baxter. 2006. Factors influencing Rocky Mountain tailed frog (Ascaphus montanus) distribution and abundance. Department of Biological Sciences Idaho State University. pp. 25 plus tables.
- Karraker, N.E. 2001. Ascaphus truei (tailed frog) predation. Herpetological Review 32(2): 100.
- Karraker, N.E., and G.S. Beyersdorf. 1997. A tailed frog (Ascaphus truei) nest site in northwestern California. Northwestern Naturalist 78(3): 110-111.
- Karraker, N.E., D.S. Pilliod, E.L. Bull, S.P. Corn, L.V. Diller. 2004. Taxonomic and geographic variation in the oviposition of tailed frogs (Ascaphus spp.). Abstract. Northwestern Naturalist 85:79.
- Kelsey, K.A. 1994. Responses of headwater stream amphibians to forest practices in western Washington. Northwest Science 68(2): 133.
- L. L. C. Jones, W. P. Leonard and D. H. Olson, eds. 2005. Amphibians of the Pacific Northwest. Seattle Audubon Society: Seattle, WA, 227 pp.
- Lamberti, G.A., S.V. Gregory, and C.P. Hawkins. 1988. Of frogs and phyton: the importance of herbivory in devastated streams of Mount St. Helens. Bulletin of the Ecological Society of America 69(2): 201.
- Landreth, H.F. and D.E. Ferguson. 1967. Movements and orientation of the tailed frog, Ascaphus truei. Herpetologica 23: 81-93.
- Lapsansky, J.M. and H.A. Brown. 1992. Oviduct histology and sperm storage in the tailed frog (Ascaphus truei). American Zoologist 32(5):147A.
- Lohman, K. 2000. Temporal and spatial variability in the abundance of tailed frog tadpoles (Ascaphus truei) in a Nothern Idaho watershed. Northwestern Naturalist 81(2):81.
- Lohman, K. 2000. Temporal and spatial variability in the abundance of tailed frog tadpoles (Ascaphus truei) in streams of the Mica Creek Experimental Watershed. Northwest Sectional Meeting of The Wildlife Society, University of Idaho, Moscow, Idaho. p
- Manville, R.H. 1957. Amphibians and reptiles of Glacier National Park, Montana. Copeia 1957: 308-309.
- Marnell, L. E. 1997. Herpetofauna of Glacier National Park. Northwestern Naturalist 78:17-33.
- Marnell, L.F. 1996. Amphibian survey of Glacier National Park, Montana. Abstract. Intermountain Journal of Sciences 2(2): 52.
- Matsuda, B.M. and J.S. Richardson. 2000. Assessing the effects of clear-cut timber harvest on the movement patterns tailed frogs (Ascaphus truei) in southwestern British Columbia. Northwestern Naturalist 81(2):82.
- Maughan, O.E, P. Laumeyer, R.L. Wallace, and M.G. Wickham. 1980. Distribution of the tailed frog, Ascaphus truei Stejneger, in several drainages in northcentral Idaho. Herpetological Review 11(1): 15-16.
- Maxell, B. A. 2000. Management of Montana's amphibians: a review of factors that may present a risk to population viability and accounts on the identification, distribution, taxonomy, habitat use, natural history, and the status and conservation of individual species. Report to USFS Region 1, Order Number 43-0343-0-0224. University of Montana, Wildlife Biology Program. Missoula, MT. 161 p.
- Maxell, B. A., J. K. Werner, P. Hendricks and D. L. Flath. 2003. Herpetology in Montana: a history, status summary, checklists, dichotomous keys, accounts for native, potentially native, and exotic species, and indexed bibliography. Society for Northwestern Vertebrate Biology, Northwest Fauna Number 5. Olympia, WA. 135 p.
- Maxell, B.A. 2002a. Amphibian and aquatic reptile inventories in watersheds in the South and Middle Forks of the Flathead River drainage that contain lakes being considered for application of piscicides and subsequent stocking of west slope cutthroat trout. Report to the Region 1 Office of the U.S. Forest Service and the Montana Department of Fish, Wildlife, and Parks. Montana Cooperative Wildlife Research Unit and Wildlife Biology Program, University of Montana, Missoula, MT. 62 pp.
- Metter, D.E. 1963. Stomach contents of Idaho larval Dicamptodon. Copeia (2): 435-436.
- Metter, D.E. 1963a. A morphological and ecological comparison of two populations of Ascaphus truei Stejneger. Ph.D. Dissertation, University of Idaho. 73 pp.
- Metter, D.E. 1964b. On breeding and sperm retention in Ascaphus. Copeia 1964(4): 710-711.
- Metter, D.E. 1966. Some temperature and salinity tolerances of Ascaphus truei Stejneger. Journal of Idaho Academy of Sciences 4: 44-47.
- Metter, D.E. 1967. Variation in the ribbed frog Ascaphuss truei Stejneger. Copeia 1968: 634-649.
- Metter, D.E. 1968a. Ascaphus and Ascaphus truei. Catalogue of American Amphibians and Reptiles. Pp 69.1-69.2.
- Metter, D.E. 1968b. The influence of floods in the population structure of Ascaphus truei Stejneger. Journal of Herpetology 1: 105-106.
- Metter, D.E. and R.J. Pauken. 1969. An analysis of the reduction of gene flow in Ascaphus truei in the northwest U.S. since the Pleistocene. Copeia 1969: 301-307.
- Mittleman, M.B. and G.S. Meyers. 1949. Geographical variation in the ribbed frog Ascaphus truei. Proceedings of the Biological Society of Washington 62: 57-68.
- Morgan, G.T. and K.M. Middleton. 1988. Organization and sequence of the compact ribosomal DNA spacer of the tailed frog, Ascaphus-truei. Nucleic Acids Research 16(22): 10917.
- Morgan, G.T. and K.M. Middleton. 1992. Conservation of intergenic spacer length in ribosomal DNA of the tailed frog, Ascaphus truei. Gene (Amsterdam) 110(2): 219-223.
- Myers, G.S. 1931. Ascaphus truei in Humboldt County, California, with a note on the habits of the tadpole. Copeia 1931: 56-67.
- Myers, G.S. 1943. Notes on Rhyacotriton olympicus and Ascaphus truei in Humboldt County, California. Copeia 1943: 125-126.
- Nielson, M. and K. Lohman. 2000. Genetic structure within an ancient lineage: the phylogeography of tailed frogs (Ascaphus truei). Northwest Sectional Meeting of The Wildlife Society, University of Idaho, Moscow, Idaho. p. 22.
- Nielson, M., K. Lohman, and J. Sullivan. 2001. Phylogeography of the tailed frog (Ascaphus truei): implications for the biogeography of the Pacific Northwest. Evolution 55: 147-160.
- Nielson, M.K. 2000. Phylogeography of the tailed frog (Ascaphus truei) : implications for the biogeography of the Pacific Northwest and a taxonomic revision within Ascaphus. M.S. Thesis. Department of Fish and Wildlife Resources, University of Idaho, Moscow, ID. 82 p.
- Nishikawa, K.C. 1991. Kinematics of prey capture in the tailed frog Ascaphus truei (Anura: Ascaphidae). Zoological Journal of the Linnean Society 103(3): 289-307.
- Noble, G.K. 1922. Editorial note on Asacaphus truei. Copeia 102: 6.
- Noble, G.K., and P.G. Putnam. 1931. Observations on the life history of Ascaphus truei Stejneger. Copeia 1931(3): 97-101.
- Pauken, R.J. and D.E. Metter. 1971. Geographic representation of morphologic variation among populations of Ascaphus truei Stejneger. Systematic Zoology 20: 434-441.
- Pilliod, D.S. and P.S. Corn. 2003. Changes in stream amphibian populations following large fires in Idaho. Abstract. Northwestern Naturalist 84:110.
- Pilliod, D.S. and P.S. Corn. 2004. Effects of wildfires on stream amphibian populations in the greater Northwest. Abstract. Northwestern Naturalist 85:85.
- Pusey, H.K. 1943. On the head of the liopelmid frog Ascaphus truei. Quarterly Journal of Microscopical Science 84: 105-185.
- Putman, P.J. 1931. Life history and habits of Ascaphus truei. Unpublished M.S. Thesis, Washington State University Library.
- Reichel, J. and D. Flath. 1995. Identification of Montana's amphibians and reptiles. Montana Outdoors 26(3):15-34.
- Reichel, J. D. 1995. Preliminary amphibian and reptile survey of the Lewis and Clark National Forest: 1994. Montana Natural Heritage Program. Helena, MT. 92 p.
- Reichel, J.D. 1996. Preliminary amphibian and reptile survey of the Helena National Forest: 1995. Montana Natural Heritage Program. Helena, MT. 87 pp.
- Reichel, J.D. 1997. Amphibian, reptile and northern bog lemming survey on the Rocky Mountain Front: 1996. Montana Natural Heritage Program, Helena, MT. 81 p.
- Ritland, K., L.A. Dupuis, F.L. Bunnell, W.L.Y. Hung, and J.E. Carlson. 2000. Phylogeography of the tailed frog (Ascaphus truei). Canadian Journal of Zoology 78: 1749-1758.
- Ritland, R.M. 1955. Studies on the post-cranial morphology of Ascaphus truei. (I) skeleton and spinal nerves. Journal of Morphology 97: 119-177.
- Rodgers, T. L. and W. L. Jellison. 1942. A collection of amphibians and reptiles from western Montana. Copeia (1):10-13.
- Roedel, M.D. and P. Hendricks. 1998. Amphibian and reptile survey on the Bureau of Land Management Lewistown District: 1995-1998. Montana Natural Heritage Program, Helena, MT. 53 p.
- Roedel, M.D. and P. Hendricks. 1998b. Amphibian and reptile inventory on the Headwaters and Dillon Resource Areas in conjunction with Red Rocks Lakes National Wildlife Refuge: 1996-1998. Montana Natural Heritage Program, Helena, MT. 46 p.
- Roper, B.B. and D.L. Scarnecchia. 2001. Patterns of diversity, density, and biomass of ectothermic vertebrates in ten small streams along a North American river continuum. Northwest Science 75(2): 168-175.
- Rundio, D.E. and C.P. Hawkins. 2000. Effects of tailed frog tadpole density on tadpole growth, invertebrate abundance, and algal abundance. Northwestern Naturalist 81(2):87.
- Schell, S.C. 1964. Bunoderella metteri gen. and sp. N. (Trematoda: Allocreadiidae) and other trematode parasites of Ascaphus truei Stejneger. Journal of Parasitology 50(5): 652-655.
- Schell, S.C., G. Anderson and I. Pratt. 1965. The life cycle of Bunoderella metteri (Allocreadiidae: Bunoderinae), a trematode parasite of Ascaphus truei. Journal of Parasitology 51(4): 579-582.
- Schmidt, K.P. 1953. A checklist of North American Amphibians and Reptiles. Sixth edition. American Society of Icthyologists and Herpetologists. 280 p.
- Schmidt, P.S. 1970. Auditory receptors of two mating call-less anurans. Copeia 1970: 169-170.
- Simons, L.H. and M. Simons. 1998. Ascaphus truei (tailed frog). Herpetological Review 29(2):106.
- Slater, J.R. 1931. The mating behavior of Ascaphus truei Stejneger. Copeia 1931(2): 62-63.
- Slipp, J.W. and G.C. Carl. 1943. Northward extensions of the range of Ascaphus. Copeia 1943(2): 127.
- Smith, H.M. 1932. Ascaphus truei Stejneger in Montana. Copeia 1932(2): 100.
- Smith, S.N. 1997. Ascaphus truei (tailed frog). Herpetological Review 28(1):47.
- Stebbins, R. C. 2003. A field guide to western reptiles and amphibians. 3rd Edition. Houghton Mifflin Company, Boston and New York. 533 p.
- Stejneger, L.H. 1899. Description of a new genus and species of discoglossoid toad from North America. Proceedings of the U.S. National Museum. Volume 21, p.899-901, pl. 89, figs. 1-4.
- Stephenson, N.G. 1951. Observations on the development of the amphicoelous frogs, Leiopelma and Ascaphus. Journal of the Linnaean Society 14: 18-28.
- Stoddard, M.A. and J.P. Hayes. 2005. The influence of forest management on headwater stream amphibians at multiple spatial scales. Ecological Applications 15(3): 811-823.
- Storm, G.L., G.J. Fosmire, and E.D. Bellis. 1994. Persistence of metals in soil and selected vertebrates in the vicinity of the Palmerton Zinc Smelters. Journal of Environmental Quality 23(3): 508-514.
- Thompson, Richard W., Western Resource Dev. Corp., Boulder, CO., 1996, Wildlife baseline report for the Montana [Montanore] Project, Lincoln and Sanders counties, Montana. In Application for a Hard Rock Operating Permit and Proposed Plan of Operation, Montanore Project, Lincoln and Sanders Counties, Montana. Vol. 5. Stroiazzo, John. Noranda Minerals Corp., Libby, MT. Revised September 1996.
- Timken, R. No Date. Amphibians and reptiles of the Beaverhead National Forest. Western Montana College, Dillon, MT. 16 p.
- Van Denburgh, J. 1912. Notes on Ascaphus, the discoglossoid toad of North America. Proceedings of the California Academy of Sciences (4) 3: 259-264.
- Van Dijk, D.E. 1955. The "tail" of Ascaphus. Ann. University Stellenbosch 31: 1-71.
- Van Eeden, J.A. 1951. The development of the condo-cranium of Ascaphus truei Stejnegar. Acta Zoologica 32: 41-176.
- Villiers, 1934a. On the morphology of the epipubis, the Nobelian bones and the phallic organ of Ascaphus truei Stejneger. Anatomischer Anzeiger 98: 23-47.
- Villiers, 1934b. Studies on the cranial anatomy of Ascaphus truei Stejneger the American "liopelmid". Bulletin Museum of Comparative Zoology Harvard 77: 1-38.
- Visalli, D. and W.P. Leonard. 1994. Ascaphus truei (tailed frog). Herpetological Review 25(1): 31
- Wahbe, T.R. 1996. Tailed frogs (Ascaphus truei, Stejneger) in natural and managed coastal temperate rainforests of southwestern British Columbia, Canada. M.S. Thesis, University of British Columbia, Vancouver, British Columbia.
- Wahbe, T.R. and F.L. Bunnell. 2001. Preliminary observations on movements of tailed frog tadpoles (Ascaphus truei) in streams through harvested and natural forests. Northwest Science 75(1): 77-83.
- Wahbe, T.R., C. Ritland, F.L. Bunnell, and K. Ritland. 2005. Population genetic structure of tailed frogs (Ascaphus truei) in clearcut and old-growth stream habitat in south coastal British Columbia. Canadian Journal of Zoology 83:1460-1468.
- Wahbe, T.R., F.L. Bunnell, and B. Bury. 2001. Philopatry and movements of tailed frogs in coastal British Columbia. Northwestern Naturalist 82(2):83.
- Wahbe, T.R., F.L. Bunnell, and R.B. Bury. 2004. Terrestrial movements of juvenile and adult tailed frogs in relation to timber harvest in coastal British Columbia. Canadian Journal of Forest Research 34:2455-2466.
- Wallace, R.L., and L.V. Diller. 1998. Length of the larval cycle of Ascaphus truei in coastal streams of the redwood region, northern California. Journal of Herpetology 32: 404-409.
- Welsh, H. H., Jr. 1990. Relictual amphibians and old-growth forests. Conservation Biology 4: 309-319.
- Welsh, H.H. Jr. and L.M. Ollivier. 1998. Stream amphibians as indicators of ecosystem stress: a case study from California's redwoods. Ecological Applications 8(4): 1118-1132.
- Welsh, H.H., Jr. 1985. Geographic distribution. Ascaphus truei (tailed frog). Herpetological Review 16(2): 59.
- Welsh, H.H., Jr. and R.J. Reynolds. 1986a. Ascaphus truei (Tailed Frog). Behavior. Herpetological Review 17(1):19.
- Welsh, H.H., Jr. and R.J. Reynolds. 1986b. Life history notes. Anura. Ascaphus truei (tailed frog). Herpetological Review 17(1): 19.
- Werner, J.K. and J.D. Reichel. 1994. Amphibian and reptile survey of the Kootenai National Forest: 1994. Montana Natural Heritage Program. Helena, MT. 104 p.
- Werner, J.K. and J.D. Reichel. 1996. Amphibian and reptile monitoring/survey of the Kootenai National Forest: 1995. Montana Natural Heritage Program. Helena, MT. 115 pp.
- Werner, J.K. and T. Plummer. 1995. Amphibian and reptile survey of the Flathead Indian Reservation 1993-1994. Salish Kootenai College, Pablo, MT. 55 pp.
- Werner, J.K. and T. Plummer. 1995. Amphibian monitoring program on the Flathead Indian Reservation 1995. Salish Kootenai College, Pablo, MT. 46 p.
- Werner, J.K., B.A. Maxell, P. Hendricks and D.L. Flath. 2004. Amphibians and Reptiles of Montana. Mountain Press Publishing Company: Missoula, MT. 262 pp.
- Werner, J.K., T. Plummer, and J. Weaselhead. 1998b. The status of amphibians on the Flathead Reservation, Montana. Intermountain Journal of Sciences 4(3-4): 88.
- Werner, J.K., T. Plummer, and J. Weaslehead. 1998. Amphibians and reptiles of the Flathead Indian Reservation. Intermountain Journal of Sciences 4(1-2): 33-49.
- Wernz, J.G. 1969. Spring mating of Ascaphus. Journal of Herpetology 3: 167-169.
- Wernz, J.G. and R.M. Storm. 1969. Pre-hatching stages of the tailed frog (Ascaphus truei Stejneger). Herpetologica 25: 86-93.
- Wickbom, T. 1950. The chromosomes of Ascaphus truei and the evolution of the annuran karyotypes. Hereditas 36: 406-418.