Refertina

• Acroporidae
• Agariciidae
• Dendrophylliidae
• Euphylliidae
• Flabellidae
• Fungiacyathidae
• Pachyseridae
• Poritidae
• Rhizangiidae
• Turbinoliidae
• Elkhorn coral Acropora palmata

  These branching structures belong to an animal, not a plant. Elkhorn coral grows in shallow Caribbean waters; thickets shelter fish and other creatures.