Common name: Anthoathecata

Anthoathecata, commonly known as athecate hydroids or naked hydroids, are an order of hydrozoans that lack the protective thecae found in their thecate counterparts. These organisms are often found in reef environments and can be both solitary and colonial. Species within this order, such as those in the genus Hydra, are known for their regenerative abilities. In the aquarium, they can be both a fascinating addition and a potential pest, as some can overgrow other sessile invertebrates.

1. 
   Common name: Violet Lace Coral

   Scientific name: Distichopora violacea
2. 
   Common name: fire coral

   Scientific name: Millepora alcicornis
3. 
   Common name: bladed fire coral

   Scientific name: Millepora complanata
4. 
   Common name: Rose Lace Coral

   Scientific name: Stylaster roseus