hydrozoan
Noun
Meaning
colonial coelenterates having the polyp phase dominant
Source: WordNetSynonyms
Hypernyms
Hyponyms
Examples
Scyphozoan and hydrozoan larvae have little yolk and most lack endosymbiotic algae, and therefore have to settle quickly and metamorphose into polyps.
Unlike the hydrozoan jellyfish, Hydromedusae, Scyphomedusae lack a vellum, which is a circular membrane beneath the umbrella that helps propels the (usually smaller) Hydromedusae through the water.