Hyliola regilla
Pacific Treefrog, Pacific Chorus Frog
family: Hylidae
subfamily: Hylinae
Taxonomic Notes: Duellman and colleagues ( propose resurrecting the unused name Hyliola for western tree frogs (Pseudacris regilla and cadaverina). The western species have been in Pseudacris for only 10 years, so the least destabilizing and likely most robust taxonomic move is to recognize three genera: Acris, Hyliola and Pseudacris. Recuero et al. (2006, Mol Phylog Evol), on the basis of limited mtDNA data and some old allozyme information, divided this taxon into three: P. hypochondrialis in Baja California and southern California, P. sierra in central California, and restricted P. regilla to northwestern California and more northerly regions. However, central Calfornia was poorly sampled and it is impossible to determine the borders of the putative species. Furthermore, there are irregularities in the distribution of mtDNA haplotypes that call the taxonomic decisions into question. The entire complex badly needs to be studied using fine scale sampling and nuclear gene sequences.

© 1999 Joyce Gross (1 of 270)

  hear call (41.1K RM file)
  hear call (3916.1K WAV file)

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Conservation Status (definitions)
IUCN (Red List) Status Least Concern (LC)
NatureServe Status Use NatureServe Explorer to see status.
Other International Status None
National Status None
Regional Status None


View distribution map using BerkeleyMapper.


From the IUCN Red List Species Account:


Range Description

This species occurs from southern British Columbia in Canada through the USA to Baja California, Mexico, then east to Montana, Idaho, and Nevada. It also occurs on the Channel Islands off southern California (Behler and King 1979). Desert populations in southern California were probably introduced. It is introduced on Queen Charlotte Islands, British Columbia (Reimchen 1990), Canada. It was recently found on Revillagigedo Island in Alexander Archipelago, Alaska, where it is probably breeding and was possibly introduced (Waters 1992). It occurs from sea level to over 3,000m asl.

Habitat and Ecology

This species is found in a wide variety of habitats including grassland, chaparral, woodland, forests and farmland. It is usually found among low vegetation near water. It breeds in marshes, lakes, ponds, ditches, reservoirs and slow-moving streams (Stebbins 1985). It lays eggs on submerged plant stems or on the bottom. It sometimes breeds in weakly brackish water.


There are many occurrences of this highly abundant species.

Population Trend


Major Threats

Introduced mosquito fish (Gambusia affinis) prey heavily on larvae and might negatively affect this species' populations (Goodsell and Kats 1999). However, this is not a pervasive threat. It is sometimes found in the international pet trade but at levels that do not currently constitute a major threat.

Conservation Actions

This species' range overlaps numerous protected areas throughout its range.

Red List Status

Least Concern (LC)

Taxonomic Notes

Recuero et al. (2006) examined patterns of mtDNA variation (including new samples and additional samples presented by Ripplinger and Wagner 2004) and reviewed available allozyme data for Pseudacris regilla (sensu lato). They concluded that P. regilla should be partitioned into three species, P. regilla, P. sierra, and P. hypochondriaca (the original proposal included different names based on taxonomic errors that were subsequently corrected). The authors did not provide detailed maps or descriptions of the ranges of the three proposed species and did not describe the contact zones between P. sierra and the other two species.


Geoffrey Hammerson, Georgina Santos-Barrera 2004. Pseudacris regilla. In: IUCN 2014


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