Assertion: earthworm's clitellum | /r/HasProperty | swelling
Facets:
value: towards the head of the animal
type: TRANSITIVE-OBJECT
Source sentences:
text: They belong to the Class Clitellata (along with earthworms, Subclass Oligochaeta) because of the presence of a clitellum, which is a swelling towards the head of the animal, where the gonads are located.