Evolutionary Relationships of Rotifers and Acanthocephalans
- A review of various proposed cladograms showing the interrelationships of the pseudocoelomates.
- http://chuma.cas.usf.edu/~garey/rotacanth.html

Introduction to the "Aschelminth" Phyla
- Berkeley's introduction to the pseudocoelomate or "Aschelminth" group of phyla.
- http://www.ucmp.berkeley.edu/aschelminthes/aschelminthes.html