No alternation of generations the medusoid phase being entirely suppressed sea anemones

• Corals

WordNet Word definitions in WordNet
See anthozoan

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Anthozoa \An`tho*zo"a\, n. pl. [NL., fr. Gr. 'a`nqos flower + ? animal.] (Zo["o]l.) The class of the C[oe]lenterata which includes the corals and sea anemones. The three principal groups or orders are Acyonaria , Actinaria , and Madreporaria .

Wikipedia Word definitions in Wikipedia
Anthozoa is a class within the phylum Cnidaria . Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula , which attaches to some substrate on which the cnidarian grows. ...