Actinozoa May 2026

: Includes sea anemones and stony corals. They typically have tentacles and mesenteries in multiples of six.

: Includes soft corals, sea pens, and sea fans. They strictly possess eight branched (pinnate) tentacles and eight mesenteries. Ecological Importance actinozoa

Actinozoans are the primary architects of , which are among the most biodiverse ecosystems on Earth. Stony corals secrete calcium carbonate skeletons that form the structural foundation of these reefs, providing habitat for thousands of other marine species. : Includes sea anemones and stony corals