Actinozoa Apr 2026

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

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.

(now more commonly known as the class Anthozoa ) is a major group of marine invertebrates within the phylum Cnidaria . This class includes well-known sea creatures like sea anemones, stony corals, soft corals, and sea fans. Key Characteristics actinozoa

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

: While sea anemones are typically solitary, many Actinozoans (like reef-building corals) form massive colonies of interconnected clones. Classification : Includes soft corals, sea pens, and sea fans

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

: 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. Stony corals secrete calcium carbonate skeletons that form

: They use tentacles armed with specialized stinging cells called nematocysts to capture prey, ranging from plankton to small fish.