H. The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most commonSecernentea are a class of Nematodes characterised by numerous Caudal papillae and an Excretory system possessing lateral canalsDiplogasterida is an order of Nematodes and the sole order of its subclass Diplogasteria.Tylenchida is an order of Nematodes List of families Superfamily Criconematoidea CriconematidaeTylenchoidea is a Superfamily of Roundworms Its members are either plant Parasites or Detritovores Heteroderidae is a family of nematodes Heteroderinae is a Subfamily of Roundworms Heterodera is a soybean cyst Nematode. Heterodera was first reported from Japan in 1916 schachtii
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