...and Intermittent: the Lacustrine has two. Littoral and Limnetic: and the Palustrine has no subsystem. Within the subsystems, classes are based on substrate...classes may appear under one or more of the systems or subsystem*. Six classes are based on substrate and flooding regime: (1) Rock Bottom with a substrate...

...Subclass - Subdivision of a class as used in the Cowardin et al. (1 979) wetland classification system. Classes are based on substrate material and flooding regime, or on vegetative life form. Subtidal- The substrate is permanently flooded with tidal water. Surface water- Any water, temporary...