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Further Observations On Helicotylenchus Vulgaris Yuen

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For more content, see Nematology.

The oval-shaped nuclei surrounding the oesophagus and glands and in the ventral hypodermal chord of H. vulgaris seem to be nuclei of the hypodermal cells and not nerve nuclei. The oesophageal glands do not envelop the intestine except perhaps at the oesophago-intestinal junction. Three larval stages of H. vulgaris were found and are best characterised by the structures of the genital primordium which consists of 4 cells in L2, 12 in L3 and 84 in L4. The structure of the genital primordium remained unchanged between moults and the length of the genital primordium did not overlap between stages. Specimens ensheathed in moulted cuticles possess the genital primordium of the next stage.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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