Two nerve rings are present in

Solution(By Examveda Team)

Two nerve rings are present in Longidorus sp. and Xiphinema sp.
Longidorus is a genus of needle nematodes. Some of its species are plant pests. They may also transmit important plant viruses such as the potato virus U or the cacao necrosis virus.
Xiphinema is a genus of ectoparasitic root nematodes commonly known as dagger nematodes.
They have a long protrusible odontostyle, with 3 basal flanges at the posterior end of the stylet and relatively posterior guiding nerve rings. The two nerve rings of the hypostomal nervous system.