http://www.biology.ualberta.ca/courses.hp/zool250/animations/Polychaete.swf
this is a flash animation created by University of Alberta
Polychaete diversity
http://www.wetwebmedia.com/polychaetes.htm
http://www.wetwebmedia.com/polychaetes.htm
Figure 1, Gametogenesis
Annelida clade
Earthworm life cycle
Oligochaeta
http://kentsimmons.uwinnipeg.ca/16cm05/16labman05/lb6pg2.htm
Poylchaete
http://concise.britannica.com/ebc/art-389/The-structure-of-polychaetes
Hirudinea
http://cache.eb.com/eb/image?id=26996&rendTypeId=4