The midgut of Acheta domesticus L. (Orthoptera: Gryllidae) is composed of anterior and posterior parts. Midgut epithelium has columnar digestive cells and regenerative cells, the latter of which form regenerative crypts. Differences at the ultrastructural level between digestive and regenerative cells of the anterior and posterior midgut are described. Processes of degeneration and regeneration are more extensive in the posterior midgut, where entire groups of the digestive cells undergo necrosis, whereas only individual degenerating cells are observed in the anterior midgut. Regenerative cells, which occupy the basal regions of regenerative crypts, proliferate intensively, and they are the stem cells of the midgut epithelium. The cells situated in the apical part of the regenerative crypt assume an epithelial character and differentiate into epithelial cells. Those digestive cells that degenerate separate from the basal lamina and are lost. Regeneration in this species proceeds in a continuous manner.
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Vol. 101 • No. 1