Fig. 6. Sections of the opaque-white region of the prosoma of the yellow spider. (A) Unstained section showing the distribution of the yellow type III granules (arrow) over the granules with microcrystal inclusions (bar, 50 µm). (B) Same region of tegument as in A observed under UV light, showing the autoflorescence of the granules with microcrystal inclusions (bar, 50 µm). (C) Same region as A and B, observed through a linear polarizer. The granules with microcrystal inclusions were birefringent whereas the type III granules (ommochromes) remained dark (arrows) (bar, 50 µm). (D) Electron micrograph of the epidermal cells of the same region, showing the granules full of inclusions of microcrystals (bar, 5 µm). (E) Detail of D showing a structure of accumulation of microcrystals (arrow) (bar, 1 µm). C, cuticle; E, epidermis.