Estrella Mountain Community College
Estrella Mountain Community College: Phylum Annelida
This section (in table of contents as "Phylum Annelida: Segmented Worms") gives a description of how segmented worms developed certain characteristics as well as it explains the differences in the evolution of different classes of...
University of Michigan
Bio Kids: Critter Catalog: Leeches
This page answers questions that students might ask about leeches, including classification information. It also has excellent photographs of them and links to more in-depth information.
University of California
Ucmp: Annelids
Describes what segmented worms are and gives a brief description of thier evolution through the use of their fossil record.
![Animal Diversity Web: Subclass Hirudinea [Leeches] Handout](https://d15y2dacu3jp90.cloudfront.net/images/attachment_defaults/resource/large/FPO-knovation.png "Animal Diversity Web: Subclass Hirudinea [Leeches] Handout")
University of Michigan
Animal Diversity Web: Subclass Hirudinea [Leeches]
This resource gives a brief description of the subclass Hirudinea and the role they have played in medicine.