 "P. sedentaria" is found in temperate, subtropical, and tropical waters of all the world's oceans, including the Mediterranean Sea.It is usually found in midwater pelagic habitats, but can be found migrating all the way to the surface.Females of "P. sedentaria" live in the barrel-like bodies of salps and pyrosomas, and use their strong pleopods to propel their homes through the water.