Heterodera canadensis n. sp. (Nematoda: Heteroderidae) from Spike-Rush (Eleocharis acicularis (L.) R. &S.) in Quebec, Canada.

Heterodera canadensis n. sp. is described and illustrated from the roots of spike-rush, Eleocharis acicularis (L.) R. &S., in Deschenes, Quebec. This new abullate species is related to Heterodera graminophila Golden and Birchfield, 1972, but differs significantly in cyst shape, cone top structures, body length of the second-stage larva (520-600 mum, vs. 380-400 for H. graminophila) and tail length (110-120 mum, vs. 57-67 for H. graminophila). A taxonomic key based on cyst and second-stage larva characters is provided for identification of the fifteen species in the Heterodera goettingiana group.