phylum platyhelminthes(n = noun.animal) platyhelminthes - flatworms;
is a kind of phylum
is a member of animal kingdom, animalia, kingdom animalia

phylum, phylum acanthocephala, phylum annelida, phylum arthropoda, phylum aschelminthes, phylum brachiopoda, phylum bryozoa, phylum chaetognatha, phylum chordata, phylum cnidaria, phylum coelenterata, phylum cryptophyta, phylum ctenophora, phylum cycliophora, phylum echinodermata, phylum ectoprocta, phylum entoprocta, phylum mollusca, phylum nematoda, phylum nemertea, phylum nemertina, phylum phoronida, phylum pogonophora, phylum porifera, phylum protozoa, phylum pyrrophyta, phylum rotifera, phylum sipuncula, platyhelminthes