Muennink's spiny rat or Okinawa spiny rat (Tokudaia muenninki, Japanese: オキナワトゲネズミ, romanized: Okinawa togenezumi or 沖縄棘鼠) is a species of rodent in the family Muridae.

[2] Endemic to Okinawa Island, Japan, its natural habitat is subtropical moist broadleaf forest.

They have a short thick body and dense fur, consisting of fine hairs and coarse, grooved spines (hence the common name “spiny rat”).

The spines cover the body except for the regions around the mouth, ears, feet and tail.

[1] In March 2008, the first wild specimen in over 30 years was caught in the northern part of Okinawa.