A swollen, glandular, saddlelike region in the epidermis of certain annelid worms, such as the earthworm, that secretes a viscous fluid to form a cocoon for their eggs.

• 环带，生殖带某些环节动物蠕虫表皮的膨胀、含腺的鞍状带，例如蚯蚓，分泌一种粘性液体而在其卵上形成一层防护层