“…Studies with electron microscopy revealed that the gut epithelium usually consists of a single layer of cells joined by junctional complexes at the apical margin, and separated by lateral intercellular spaces (Komuro & Yamamoto, 1968;Georgi, 1969;Koulish, 1971;Talbot, Clark & Lawrence, 1972;Hootman & Conte, 1974;Holdich & Mayes, 1975;Quaglia, Sabelli & Villani, 1976;Mykles, 1977Mykles, , 1979Johnson, 1980;see Gibson & Barker, 1979 for a review on the hepatopancreas). Commonly observed features include microvillous apical borders, and elaborate infoldings of the lateral and basal membranes that are closely associated with numerous mitochondria.…”