Clitellum - Wikipedia

Phylum Annelida- characteristics, classification, examples

Lumbricus terrestris – 10,000 Things of the Pacific Northwest

Earthworm - Wikipedia

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Annelid - Leech, Parasitic, Bloodsucking

What is the function of the clitellum on an earthworm and why is that important? - Quora

Megascolex konkanensis. A. Preclitellar region, B. Clitellum and female

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Earthworm - Lampito mauritii - Morphology, Anatomy, Digestive system, Respiratory System, Circulatory system, Nervous System, Excretory System, Reproductive System, Life cycle

Notes and Resources: Phylum Annelida

Earthworm - CreationWiki, the encyclopedia of creation science