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 based on their symmetry and tentacle count:
: Includes sea anemones and stony corals. They typically have tentacles and mesenteries in multiples of six. actinozoa
: 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 ) 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 The name Actinozoa stems from the Greek words
: Includes soft corals, sea pens, and sea fans. They strictly possess eight branched (pinnate) tentacles and eight mesenteries. Ecological Importance
: 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. : They use tentacles armed with specialized stinging
: While sea anemones are typically solitary, many Actinozoans (like reef-building corals) form massive colonies of interconnected clones. Classification