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Petasidae is a family of cnidarians belonging to the order
Trachymedusae Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by the ...
. Genera: * '' Petasiella'' Uchida, 1947 * '' Petasus'' Haeckel, 1879


References

Trachymedusae Cnidarian families {{hydrozoa-stub