Figure 2. Scanning electron photomicrographs show the microstructure of head scales (A, ~400X and B, 5000X) ofP. fieldi .
The microstructure of top of the head and midbody dorsal scales inP. urarachnoides is different from its congeners with an uneven appearance and granular surface (Figures 3A & B). The microstructure of the caudal appendages and knob-like structure on the tip of tail show a smooth and flattened shape with numerous pores at high magnification (Figures. 3C ̵̶ E).