Imperial shrimp riding on a sea cucumber.

 (Bunama, Milne Bay, Papua New Guinea)

arthropod; crustacean; decapod; shrimp; commensal shrimp; imperial shrimp; Arthropoda; subP Crustacea; Malacostraca; Decapoda; subOrder Pleocyemata; infraOrder Caridea; superFamily Palaemonoidea; Palaemonidae; subFamily Pontoniinae; Periclimenes imperator; commensal behavior;

echinoderm; holothurian; sea cucumber; Echinodermata; Holothuridea; Apodida; Synaptidae; Synapta oceanica, South Pacific