invertebrate animal aquatic invertebrate An aquatic invertebrate may live entirely beneath the water, or may live upon its surface or on the plants surrounding it. Some breathe air, others breathe water. To move, they may walk, swim, float, skate, fly or glide on their bellies—or they may not move much at all. Because snails are members of gastropod, a subclass of molluscs, ... leading to aquatic invertebrates, we can't make aquatic invertebrates disjoint with terrestrial invertebrates. aquatic invertebrate material