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