Actinozoa ⭐

: The body consists of a central gastrovascular cavity divided by vertical partitions called mesenteries or septa. These mesenteries increase the surface area for digestion and support the gonads.

Historically, Actinozoa was divided into two main groups based on their symmetry and tentacle count: actinozoa

: Unlike many other cnidarians (such as jellyfish), Actinozoans do not have a medusa (free-swimming) stage in their life cycle. They remain as polyps throughout their lives. : The body consists of a central gastrovascular

: Includes sea anemones and stony corals. They typically have tentacles and mesenteries in multiples of six. They remain as polyps throughout their lives

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.