Idotea urotoma

Idotea urotoma is variable in appearance, but it typically matches the color of the seaweed or seagrass on which it is found, ranging from yellowish gold to reddish brown or black.^[3] At the telson or the rear end of the organism's body, the margin is broadly triangular, where the right and left sides converge without a distinct median projection.^[4] This feature distinguishes the blunt-tailed isopod from other similar isopods. Also, along with I. rufescensand I. ochotensis, the blunt-tailed isopod is the only other Idotea species that has a maxilliped palp with four rather than five articles.^[5]

Like other isopods, the blunt-tailed isopod is gonochoric. Mating usually occurs before and sometimes during the time of molting.^[6]