clitellum

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clitellum
of an earthworm

cli·tel·lum

 (klī-tĕl′əm)
n. pl. cli·tel·la (-tĕl′ə)
A glandular swelling of the epidermis of certain annelid worms, such as earthworms, that secretes a viscous fluid to form a cocoon in which the eggs are deposited.

[New Latin clītellum, sing. of Latin clītellae, packsaddle; see klei- in Indo-European roots.]

clitellum

(klɪˈtɛləm)
n, pl -la (-lə)
(Zoology) a thickened saddle-like region of epidermis in earthworms and leeches whose secretions bind copulating worms together and later form a cocoon around the eggs
[C19: from New Latin, from Latin clītellae (plural) packsaddle]