Okinawa Spiny Rat
Tokudaia muenninki
Overview
Muennink's spiny rat or Okinawa spiny rat is a species of rodent in the family Muridae. Endemic to Okinawa Island, Japan, its natural habitat is subtropical moist broadleaf forest. The karyotype has 2n = 44. Its sex chromosomes are abnormally large, while the other two species in Tokudaia have lost their Y chromosome. It is found only on the northern part of the island, above 300 m, and is thought to inhabit an area of less than 3 km2.
Tokudaia muenninki faces severe threats from habitat destruction due to deforestation and agricultural expansion on Okinawa Island. The species' extremely restricted range makes it particularly vulnerable to habitat fragmentation, while introduced predators such as cats and mongooses pose additional pressure on remaining populations. Climate change and typhoons further threaten the limited forest patches this endemic rodent depends upon for survival.
Habitat
This endemic rodent inhabits the remaining subtropical evergreen forests of Okinawa Island in the Ryukyu archipelago of Japan. It prefers dense forest understory with thick leaf litter and fallen logs, typically in areas with minimal human disturbance.
Conservation measures underway
Other threatened species in MURIDAE
Threatened in Japan
Frequently asked questions
Why is Okinawa Spiny Rat classified as Critically Endangered?
Where does Okinawa Spiny Rat live?
What are the main threats to Okinawa Spiny Rat?
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