Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Ranidae

Scientific Name: Odorrana utsunomiyaorum
Species Authority: (Matsui, 1994)
Rana utsunomiyaorum Matsui, 1994
Taxonomic Source(s): Frost, D.R. 2013. Amphibian Species of the World: an Online Reference. Version 5.6 (9 January 2013). Electronic Database. American Museum of Natural History, New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Needs updating
Assessor(s): Yoshio Kaneko, Masafumi Matsui
Reviewer(s): Global Amphibian Assessment Coordinating Team (Simon Stuart, Janice Chanson and Neil Cox)
Listed as Endangered because its Extent of Occurrence is less than 300km2, its distribution is severely fragmented, there is a continuing decline in the extent and quality of its habitat.

Geographic Range [top]

Range Description: This species is endemic to the Japanese islands of Ishigakijima and Iriomotejima.
Countries occurrence:
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no information on the population status of this species, although the populations on Ishigakijima have undergone substantial declines.
Current Population Trend: Decreasing
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: It inhabits upstream areas surrounded by primary broad-leaved evergreen forest, and breeds in streams.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): The major threats are deforestation and competition with increasing populations of the exotic Bufo marinus, particularly on Ishigakijima.

Conservation Actions [top]

Conservation Actions: In Japan its range includes Iriomote Island which is now protected as a national park, although there is clearly a need for improved protection of forest habitats in these islands. There is also a need to control invasive toads, especially within protected areas.

Citation: Yoshio Kaneko, Masafumi Matsui. 2004. Odorrana utsunomiyaorum. The IUCN Red List of Threatened Species 2004: e.T58743A11835763. . Downloaded on 07 October 2015.
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