Tokudaia osimensis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Tokudaia osimensis
Species Authority: (Abe, 1934)
Common Name(s):
English Amami Spiny Rat, Ryukyu Spiny Rat
Taxonomic Notes: The population from Tokunoshima originally attributed to this species, was recently elevated to species status as Tokudaia tokunoshimensis by Endo and Tsuchiya, 2006.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii,v) ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor(s): Ishii, N. & Kaneko, Y.
Reviewer(s): Amori, G. (Small Nonvolant Mammal Red List Authority) & Chanson, J. (Global Mammal Assessment Team)
Listed as Endangered as the extent of occurrence is less than 5,000 km², its range is severely fragmented, and there is a continuing decline in the extent and quality of the species' habitat due to deforestation, and a decline in the number of individuals due to predation and competition with introduced species.
2000 Endangered
1996 Endangered
1996 Endangered (Baillie and Groombridge 1996)
1994 Vulnerable (Groombridge 1994)
1990 Endangered (IUCN 1990)
1988 Indeterminate (IUCN Conservation Monitoring Centre 1988)
1986 Indeterminate (IUCN Conservation Monitoring Centre 1986)

Geographic Range [top]

Range Description: This species is found only on Amami-oshima island, of the Amami Islands in the Ryukyu Archipelago of Japan. Since 1980, the species has become restricted to the central part of Amami-oshima (Japan RDB, 2002). Currently the species is found in the southwest of Amami-oshima, but there is an isolated population in the northeast (Abe, et al., 2005). Its elevational range is from sea level up to 500 m asl.
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species was common on Amami-oshima until the 1960s, when the population declined. The population has been shown to decline with reductions of chinquapin seedlings following some typhoons (Abe, et al., 2005).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: The species prefers secondary broad-leaved forests, although it can also be found in intact forests (Abe, et al., 2005). It has not been observed in plantations.
Systems: Terrestrial

Threats [top]

Major Threat(s): Habitat destruction has severely decreased the available forest habitat on the island (Japan RDB, 2002). Feral cats and dogs present on the island are known to predate this species (Japan RDB, 2002; Abe, et al., 2005). Introduced mongoose (Herpestes javanicus) are a major predator on the island, and competition also exists with Rattus rattus.

Conservation Actions [top]

Conservation Actions: It is present in Amami Quasi National Park. The control of introduced predators is needed. It is listed as Endangered (EN) in the Japanese Red List (2007).

Citation: Ishii, N. & Kaneko, Y. 2008. Tokudaia osimensis. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 27 March 2015.
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