Taken primarily from Kozloff, 1987, 1996 p. 71 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Colonial, the bases of the polyps connected; column with sand and other foreign material embedded in it | Zoanthids:
Order Zoanthidea , Epizoanthus scotinus |
| 1b | Not colonial (but some species form large aggregations by asexual multiplication); column without sand or other foreign material embedded in it, although such material may adhere to the outside of it, and an external calcareous skeleton may be present | 2 |
| 2a | Polyps with a calcareous external skeleton | Corals:
Order Scleractinia |
| 2b | Polyps without a calcareous skeleton | 3 |
| 3a | Tentacles with knobs on their tips (picture) | Corallimorphs:
Order Corallimorpharia, Corynactis californica |
| 3b | Tentacles without knobs at their tips | Anemones:
Order Actiniaria |
