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Hydrozoans

Animal
Hydrozoa is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialized individual... Wikipedia
Scientific name: Hydrozoa
Phylum: Cnidaria
Class: Hydrozoa; Owen, 1843
Kingdom: Animalia
Domain: Eukaryota
Subphylum: Medusozoa