Acoel Flatworm

Waminoa brickneri

Waminoa brickneri is a worm from the Convolutidae family, which belongs to the Acoelomorpha strain. While the majority of acoels live in marine sediments, some, usually identified as Waminoa sp., have been found associated with corals, living closely appressed to their external surfaces.
Acoel Flatworms (Waminoa brickneri) on Fungia coral Diver's lodge House Reef, Lembeh.
These worms can infect corals in large numbers (see also next spotting) and harm their host by shading and by destroying the protective mucus layer, reducing the coral defenses. So no good news to see many of these on a coral. Acoel Flatworm,Geotagged,Indonesia,Spring,Waminoa brickneri


Waminoa brickneri can infest corals in high numbers, often forming clusters in non-overlapping arrays. It is bronze-colored, owing to the presence of two types of dinoflagellate endosymbionts, and speckled white with small scattered pigment spots. Its body is disc-shaped, highly flattened and circular in profile except for a small notch at the posterior margin where the reproductive organs lie. The male copulatory organ is poorly differentiated, but comprises a seminal vesicle weakly walled by concentrically layered muscles, and a small penis papilla with serous glands at its juncture with the male pore. The female system comprises a separate female pore, ciliated vagina, seminal bursa, 4–8 weakly sclerotized nozzles, and paired ovaries.
Acoel Flatworm - Waminoa brickneri The 2 small brown thing are the Acoel Flatworm, seen here on Bubble Corals, one of their food source. Acoel Flatworm,Anilao,Batangas,Philippines,Waminoa brickneri


Waminoa brickneri was first scientifically described in 2005 by Ogunlana, Hooge, Tekle, Benayahu, Barneah & Tyler.


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SpeciesWaminoa brickneri