Flatworms: British Marine Life Study Society - One page about a planarian and one page about the life cycle of the digenean Cryptocotyle lingua, with a few photographs.

Introduction to the Platyhelminthes - Introduction to the Platyhelminthes, the flatworms: life in two dimensions. One page of text with a few photographs.

Marine Flatworms of the World - This site is mainly devoted to the Polyclads, an order of brightly-colored tropical platyhelminths. A long and detailed presentation of the Platyhelminthes, and hundreds of beautiful pictures of living specimens.

Meiofauna - Matthew Hooge - A personal page with many beautiful photographs of free-living Platyhelminthes, including actin labelling.

Platyhelminthes - A summary of platyhelminth characteristics, with emphasis on the three parasitic classes.

Bibliography on Ultrastructure of Spermatozoa of Parasitic Platyhelminthes - A tool for future research on the parasitic Platyhelminthes (Aspidogastrea, Digenea, Polyopisthocotylea, Monopisthocotylea, Gyrocotylidea, Amphilinidea, and Eucestoda).

Platyhelminthes Hub - Links to research articles and images.

Fredrick the Flatworm - Information and images of different types of Platyhelminthes (flatworms). [Javascript required]

Monogenean Trematodes - A short page about monogeneans parasitic in fishes and how to control them. Also available as PDF file.

Turbellarian Platyhelminths Taxonomy - A regularly updated hierarchical taxonomy of Platyhelminthes, by Seth Tyler.

Monogeneans of the Black Sea - List, descriptions and drawings of several species of monogeneans parasitic in fishes of the Black Sea.