Phylum Cnidaria, Class Hydrozoa
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Hydra belongs to the phylum Cnidaria.
Insects belong to the phylum Arthropoda and the class Insecta.
Nautilus belongs to the phylum Mollusca and the class Cephalopoda.
The house cat belongs to the phylum Chordata and the class Mammalia.
A butterfly belongs to the phylum Arthropoda and the class Insecta.