Hard Corals consist of two types: SPS and LPS. SPS stands for Small Polyp Stonies and LPS stands for Large Polyp Stonies.
- Small stony polyps are corals like acropora species.
- Large Polyp Stonies are chalices, lobophyllia, trachaphyllia, etc. An amazing example of Large Polyp Stonies is
I like to think of mouth size when thinking about this classification. SPS corals are filter feeders, using hair like fingers to catch small microscopic food sources such as phytoplankton &/or zooplankton.
LPS corals have much larger mouths and numerous visible sticky fingers which can catch and move food toward the oral cavity.