Actinozoa

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

: 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.

(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

: 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: : While sea anemones are typically solitary, many

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

: They use tentacles armed with specialized stinging cells called nematocysts to capture prey, ranging from plankton to small fish. (now more commonly known as the class Anthozoa

The name Actinozoa stems from the Greek words aktis (ray) and zoon (animal), referring to their radial symmetry and the "ray-like" appearance of their tentacles.