Question: what are the coxal glands?
Answer: Coxal gland, in certain arthropods, one of a pair of excretory organs consisting of an end sac where initial urine is collected, a tubule where secretion and reabsorption may take place, and an excretory pore at the base (coxa) of one of the legs. ... In many higher crustaceans the excretory glands are located in the head.