Quills are modified hairs formed into sharp, barbed, hollow spines. Lionfish venomous dorsal spines are used purely for defense. Bony fish have fin spines and rays called lepidotrichia. They end mainly on the dendritic spines of the spiny neurons. The illicium is the detached and modified first three spines of the anterior dorsal fin. Some species are covered with spines and tubercles. There may also be protrusions such as microvilli, cilia, bristles, spines and tubercles. The legs are robust and often clad in bristles, hairs or spines. The most common injuries were fractures of ribs, spines, pelvises, and lower extremities. The pronotum bears several sharp, conical spines. The body is covered with short hairs and black spines and white dots. The fruits are oval and flattened, with short styles and hooked spines. The leaves can be herbaceous, leathery, or transformed into spines. They have pointed spines towards the broader base on one side, i.e. lateral spines. Notochaetae stout with distinct rows of spines and blunt tip.