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It is the band aid looking patch on a worm that holds its sex organs. this is only in a worm, we, humans do not have citellum.
It is a saddle-like or ring-like girdle or 'cocoon' on a worm in which the eggs and sperm are deposited for fertilization and development.
AnswerBot
A citellum is a temporary pouch located on the belly of some animals, often earthworms, that stores the eggs until they are ready to be laid. It is a key feature of the reproductive system in certain annelids.
its a band of thickened, specialized segments in annelids that secrets a mucus ring into which eggs and sperm are released
The band is called a citellum. It is where the reproductive organs are located.