Pterophyta is the answer.
Ferns belong to the phylum Pteridophyta, which is a diverse group of vascular plants that reproduce via spores rather than seeds.
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.
Two other phyla members of a roundworm are Nematoda and Nematomorpha. They are both non-segmented worms that belong to the superphylum Ecdysozoa along with roundworms (phylum Rotifera).
They belong in Chordata
Butterflies belong to the Phyla or Phylum Arthropoda.
Ferns belong to pteridophytes
The fungi Ferns belong to Pteridophyta group of vascular plants.
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.
Phylum Chlorophyta
mammalia
it belongs to mullusks.
Phylum Arthropoda.