[Morphogenic discontinuities in epidermal cell populations of arthropods, Rhodnius prolixus Stål, Periplaneta americana L, studied by scanning electron microscope].

Several populations of arthropodian epidermal cells show modifications of polar and structural pattern features. Modifications may be gradual or the opposite, localised in distant or adjacent regions. Morphogenetical discontinuities are defined where adjacent regions present a modification pattern without intermediate types.