An adult female citrus nematodes, <i>Tylenchulus semipenetrans,</i> shown imbedded in a root cut in cross section. The  nematode's front end is deep inside the root tissue while the rear end remains outside of the root.
An adult female citrus nematodes, Tylenchulus semipenetrans, shown imbedded in a root cut in cross section. The nematode's front end is deep inside the root tissue while the rear end remains outside of the root.
Credit: Seymour Van Gundy