Abstract
Nematodes that transmit viruses to plants are known to occur only in two suborders of the order Dorylaimida class Adenophorea whereas most other plant parasitic nematodes are in the order Tylenchida class Secernentea. Plant parasitism seems to have developed independently in these two classes. Maggenti (18) suggests that the Adenophorea are the older group and that within the Dorylaimida there are two relatively recent divergent lines; one containing the genera Longidorus, Paralongidorus and Xiphinema, some species of which transmit nepoviruses (see Taylor and Robertson in these Proceedings), is in the family Longidoridae, suborder Dorylaimina. The other line containing the genera Trichodorus and Paratrichodorus, some species of which transmit tobraviruses, is in the family Trichodoridae, suborder Diphtherophorina. Although species of Paralongidorus have not so far been implicated as virus vectors their morphology is so similar to Longidorus that it is probably prudent to treat them as potential virus vectors.
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