Way different...Annilids are a phylum of the lophotrochozoa and
nematodes are a phylum of ecdysozoa...
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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).
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Both groups molt using the ecdysone hormone, making a close
relation probable. ^^ The name's quite unimaginative, zoa meaning
'animals'. :P