Types of Organisms
•Mollusks
•Crustaceans
•Fish
•Algae
•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.