**2. Taxonomic position**

When the SCN was discovered, it was believed as a race of *Heterodera schachtii,* the sugar beet cyst nematode, since these 2 species are closely related biologically. Around that time, cyst nematodes were generally considered races of *H. schachtii*. In 1940 Franklin's comparative morphological studies led to many "races" being elevated to species. It was morphologically consistent that the morphological distinctions of the SCN led Ichinohe to elevate the race to a new species in 1952.

Phylum Nematoda,

 Class Secernentea, Order Tylenchida, Suborder Hoplolaimina, Superfamily Hoplolaimoidea, Family Heteroderidae, Genus *Heterodera*, Species *Heterodera glycines* (Ichinohe 1952)
