Abstract
The midgut basal lamina of third instar Oryctes rhinoceros larvae was observed to consist of three structured layers. Each layer contained two structural elements regularly arranged with respect to one another. Type I elements appeared to be morphological variations of closed cylinders with increasing diameters in each layer. The layer of basal lamina closest the midgut epithelium had the smallest, most regular Type I elements. In that layer furthest from the midgut cells the Type I elements were the largest and irregular in shape. Type II elements were morphologically similar in all layers, appearing as dense rod-like elements with a triangular cross section in the plane of the lamina. These elements were interconnected by fine fibrils to form a basic repeating unit: One Type II element surrounded by three Type I elements. Perfect packing of the basic units within the layers of the basal lamina resulted in a pattern of each element type surrounded by three elements of the opposite type. However, variability in the packing of the basic repeating unit frequently occurred.
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