These flatworms were all photographed in the Marshalls Islands. We are not flatworm experts and positive identification of species and genera often require detailed examination of the internal anatomy, but Newman & Cannon (2003), Newman & Cannon (CD) and Ryanskiy (2021) were very helpful in guiding identification of these variable and often colorful animals. Much remains to be learned about them, and many species are likely to still lack names.
Measurements were rarely taken in the field and animals were not collected, so any sizes given are usually very rough eyeball estimates often based on distant memories, and are provided only as a general guideline of what to look for.
We welcome corrections or comments at uwkwaj@yahoo.com. Clicking on the thumbnails below brings up a page for that species.
Acoela flatworms
Suborder Acotylea
Family Cestoplanidae
Family Euryleptidae
Family Leptoplanidae (or Hoploplanidae?)
Family Planoceridae
Family Pericelidae
Family Prosthiostomidae
Family Pseudocerotidae
Stylochidae
Family Unknown
A few flatworms from other areas
