hydrozoa

• Таксономический класс кишечнополостных, у которых обычно наблюдается чередование поколений, при котором гидроидная фаза обычно колониальна и даёт начало медузоидной фазе путём почкования; включает гидр и медуз.

A taxonomic class of coelenterates that typically exhibit alternation of generations, where the hydroid phase is usually colonial and gives rise to the medusoid phase by budding; includes hydras and jellyfishes.

uncountable · proper noun

1. Class of aquatic animalsC2formalscientific

   A class of small, predatory aquatic animals within the phylum Cnidaria, typically having both a polyp and a medusa stage in their life cycle.

   Гидрозои

   • The class Hydrozoa includes familiar animals like hydras and some jellyfish.
   • Many Hydrozoa species form complex colonies, such as the Portuguese man o' war.
   • The life cycle of Hydrozoa often alternates between a sessile polyp stage and a free-swimming medusa stage.