Blunt-Tailed Isopod

Idotea urotoma

The Blunt-tailed Isopod is a marine crustacean found in the intertidal and shallow subtidal zones along the Pacific coast from Washington's Puget Sound to Mexico's Baja California. This species is adept at blending into its environment, often taking on the color of the seaweed or seagrass it inhabits, with hues ranging from yellowish gold to reddish brown or black. Its telson is broadly triangular, with sides converging smoothly, a feature that helps distinguish it from similar species. Typically found at depths less than 40 meters, with most sightings at under 20 meters, the Blunt-tailed Isopod prefers coastal waters, especially those with seagrass beds. It is a gonochoric species, meaning individuals are distinctly male or female. Mating often occurs before or during molting, and the eggs are carried in a pouch until they hatch into a juvenile form known as manca, which eventually matures into an adult. Although the Blunt-tailed Isopod's conservation status has not been assessed by the IUCN, it is commonly observed at various dive sites. Divers may find it well-camouflaged among vegetation, making it a challenge to spot.