links [ edit ] Taxonomy Krill belong to the large arthropod subphylum , the Crustacea . The most familiar and largest group of crustaceans, the class Malacostraca , includes the superorder Eucarida comprising the three orders, Euphausiacea or krill, Decapoda (shrimp, lobsters, crabs), and the planktonic Amphionides . The order Euphasiacea