In plant parasitic Tylenchids, median valve is present within

Answer: Option B

In plant parasitic Tylenchids, the median valve is present within Metacorpus.
An order of nematodes in which the labial region is variable and may be distinctly set off or smoothly rounded and well developed; the hexaradiate symmetry is most often retained or discernible. The amphids are porelike, oval, slitlike, or clefts located on the lips.
The swollen posterior part of the corpus in the pharynx of a nematode is known as metacorpus. In this median valve is present.