Phylum Annelida

Class Polychaeta

Nereis sp.

"trunk"

"parapodium"

Class Clitellata

Subclass Oligochaeta

Earthworm

"nephridium"

"pharynx"

"esophagus"

"clitellum"

Subclass Hirudinea

Leech

"anterior"

"middle"

"posterior"

"botyroidal tissue"