Morphology of the Terminal Areas of White Females and Cysts of the Genus Heterodera (s.g. Globodera).

Using a scanning electron microscope and an interference contrast microscope, distinct morphological differences were found in the terminal areas of white females and cysts of six species of the genus Heterodera (s.g. Globodera). Suffident differences to separate species were established on the basis of length of vulval aperture in the white female; arrangement, number and size of the perineal tubercles and vulval bodies in the white female; and presence or absence of a circumfenestral area and width of the cuticular grooves in the cyst.