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AIntroFIG 5: TEM showing wrinkling and changes in body structure with age.
A.TEM of young adult exhibiting thin cuticle with annuli appearing in regular, evenly spaced patterns. Note organized muscle structure and gonad (gonad is seen obliquely so that the rachis is not in frame of thin section). (Image source: [Hall] N533 F1_Z731.)
B. Lengthwise electron microscopy image of 7-day-old adult (class B) with thickened cuticle that has deep wrinkles with annuli that are less even and distinct in appearance. Electron dense yolk protein fills the body cavity (pseudocoelom) and there is extensive vacuolization of the intestinal cell cytoplasm while the lumen is filled with live bacteria. (Image source: {Hall] N824 5073.)
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