Siderastreidae is a family of reef building stony corals.

Members of the family include symbiotic algae called Zooxanthellae in their tissues which help provide their energy requirements.

The corallites are linked by flowing septa that have granular margins and that are fused in the centre to give fan-shaped or star-shaped groupings.

The corallites do not project from the surface of the coral and have ill-defined walls formed from thickened septa.

[2][3] The World Register of Marine Species includes the following genera in the family:[1][2]