Cristarmadillidium muricatum is a small, spiny woodlouse native to Spain.

 
 It is characterized by its prickly appearance due to the tubers on its body and its color, often pale orange or light brown.
 
 It is a small species, with adults generally measuring less than 1 centimeter.
 
 It is valued in terrarium keeping as a detritivore (substrate cleaner) in bioactive terrariums.
 
 Like many woodlice, it is nocturnal and feeds on decaying plant matter.