part_of adult malpighian tubule epithelial lining adult malpighian tubule pyramidal cell Fig. 10-7, in Biology of Ticks ISBN:0-19-505910-7. One of the two types of epithelial cells that develop after blood feeding when the malpighian tubules are metabolically active in processing excretory wastes into guanine crystals. These differentiated cells are most prominent in the proximal regions of the malphighian tubules. TADS:0000567 TADS:0000567 default_namespace