the functional design of the insect excretory system - The Journal of ...
the functional design of the insect excretory system - The Journal of ...
the functional design of the insect excretory system - The Journal of ...
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<strong>Journal</strong> <strong>of</strong> Experimental Biology, Vol. 90 Fig.<br />
Fig. 2. Electron micrographs <strong>of</strong> sections through <strong>the</strong> walls <strong>of</strong> <strong>the</strong> Malpighian tubules <strong>of</strong> (a) a<br />
millipede, Glomeris marginata ( x 20000; micrograph courtesy <strong>of</strong> Dr J. A. Riegel), and (b) an<br />
<strong>insect</strong>, Rhodnius proluxus (X3000; micrograph courtesy <strong>of</strong> Dr B. S. Hill). In <strong>the</strong> wall <strong>of</strong> <strong>the</strong><br />
tubule <strong>of</strong> FViodnius, intercellular clefts that could act as pathways for materials to cross <strong>the</strong> wall<br />
passively are not <strong>of</strong>ten encountered even in low-power micrographs such as that shown. In<br />
contrast, <strong>the</strong> wall <strong>of</strong> <strong>the</strong> tubule <strong>of</strong> Glomeris shows many such clefts, even in a higher-power<br />
micrograph <strong>of</strong> a section taken from a part <strong>of</strong> <strong>the</strong> cell near <strong>the</strong> nucleus.<br />
S. H. P. MADDRELL
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