Fig. 8. Tissue structure of M. posthuma before and after exposure to 1500 J m^-2 of UV-B. (A) Cross-section of M. posthuma without UV-B exposure, showing the cuticle (C) and epidermis (E). (B) Right after UV-B exposure, no obvious damage was seen in the cuticle or epidermis. (C) After 36 h exposure to UV-B, the cuticle and epidermis are pleated, and some epidermal cells show necrosis. (D) After 48 h exposure, the epidermis is destroyed and some circular muscle (CM) is deformed (arrow). L, longitudinal muscle. Scale bar, 50 µm.