copepoda(n = noun.animal) subclass copepoda - minute planktonic or parasitic crustaceans;
is a kind of class
is a member of class crustacea, crustacea
An order of Entomostraca, including many minute Crustacea, both fresh-water and marine. [1913 Webster]
" They have a distinct carapace. The eggs are carried in a pair of external pouches. Some are parasites of fishes." [1913 Webster]