- Branching colonies with rigid skeleton of intermeshed calcium carbonate spicules, colored red (or sometimes pink) by carotenoid pigments -- branching may be relatively sparse or quite dense, resulting in a bushy shape
- In living colony, skeleton overlaid by soft-tissue integument
- Short and hemispheric calyces distributed on branches
- In living colonies, extended radially symmetrical polyps are translucent-white, with eight tentacles and fine pinnules but without sclerites
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