In classification of helminthes the higher taxa platyhelminthes containing helminthes of veterinary importance are

In classification of helminthes the higher taxa Platyhelminthes containing helminthes of veterinary importance are Flatworm.
Flatworms are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
They are acoelomates and have no specialized circulatory and respiratory organs, which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion.