Final answer:
The excretory antennal glands in decapods are known as green glands. They are responsible for filtering and excreting waste from the blood, located near the base of the antennae.
Step-by-step explanation:
The excretory antennal glands in decapods are also called green glands. Decapods, which are a group of crustaceans, have evolved specialized structures for excretion and osmoregulation. The green glands, also known as antennal glands, are located near the base of the antennae and serve the purpose of filtering waste from the blood and excreting it out of the body. This is different from other excretory mechanisms such as Malpighian tubules in insects or nephridia in annelids like earthworms, which also serve to remove waste but are structured and function differently. Additionally, these should not be confused with coxal glands, which are present in some other arthropods, or with nephridia, which have a tubule system for reabsorption and excrete waste through a nephridiopore.