Anemones {sea anemone} {anemone, coral} {coral} use vertical partitions in hollow sac to make chambers to increase digestive surface, have gullet between mouth and hollow sac, and secrete carbonates. Anemones have one stalk with top stinging-tentacle ring. Corals make reefs. Living parts are on top, and sand and dead algae and coral are below.
Reef coral can look like brain cortex {brain coral} (Meandrina).
Coral colonies can have horny flexible branching axial skeletons {gorgonian} (Gorgonacea). Sea whips are gorgonians with long single stems. Sea fans have fan-shaped or tree-shaped skeletons.
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Date Modified: 2022.0225