•Sponges,
hydroids, flatworms, polychaetes, oligochaetes,
bryozoans, amphipods, copepods, shipworms, ascidians
(many species occur in Caribbean but some are
considered cryptogenic)
Carlton and Ruckelshaus, 1997
These
are the kinds of organisms that can are introduced into US waters. But
because some of the introductions took place so long ago. We cannot be sure
if some species are indeed introduced. The term we use for those is
cryptogenic.