Sting a stiff pointed spine , integumentary sheath , and accompanying venom glands .
一根硬的尖棘，具外皮鞘，而且伴随著毒腺。
Which is why dr zheng was stunned to find on tianyulong confuciusi what are conservatively described in her paper as " long , singular and unbranched filamentous integumentary structures " .
