Pterophyta is the answer.
Hydroids belong to the phylum Cnidaria.
A butterfly belongs to the phylum Arthropoda and the class Insecta.
The five main plant phyla are the Anthocerotophyta (hornworts), Bryophyta (mosses), Marchantiophyta (liverworts), Pteridophyta (ferns), and Spermatophyta (seed plants). Each phylum represents different groups of plants with unique characteristics and reproductive strategies.
Organisms that belong to the same class must also belong to the same phylum. Classes are subdivisions of phyla in the classification hierarchy of organisms.
A domain is bigger than a phyla. A domain is the highest level of biological classification, encompassing multiple kingdoms. Phyla belong within the kingdom level of classification.
They belong in Chordata
Butterflies belong to the Phyla or Phylum Arthropoda.
Ferns belong to pteridophytes
Platyhelminthes is the phyla of the marine flatworm.
Chordata
Echinodermata
They belong to the phyla Platyhelminthes, along with the flatworms. Members in this phyla are acoelomates.
mammalia
it belongs to mullusks.
Phylum Chlorophyta
Phylum Arthropoda.
they belong to the plantae kingdom