| Size | Usually smaller | Moderate size |
| Canal System | Simple, with a single central spongocoel | More complex, with a system of radial canals leading to the spongocoel |
| Body complexity | Simplest body plan | Intermediate complexity |
| Structure | Tubular and vase-shaped body | Body with a more folded or convoluted structure |
| Osculum | Located at the apex (top) of the body | Typically located on the side or in a depression |
| Surface area for feeding | Limited surface area for water flow | Increased surface area due to folding, allowing more efficient water flow |
| Water circulation | Water enters through dermal ostia, passes through spongocoel, and exits through osculum | Water enters through dermal ostia, moves through radial canals, and exits through spongocoel and osculum |
| Choanocyte chamber | Absent | Present, forming chambers in the radial canals |
| Examples | Leucosolenia | Sycon, commonly used to represent syconoid sponges |
