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worms > Phylum Platyhelminthes > Subgroup Acoela
Acoel flatworms
awaiting identification
updated Oct 08

Where seen? These tiny flatworms are often seen on other animals, usually cnidarians such as hard corals of all kinds and corallimorphs.

What are aceol flatworms? They belong to Phylum Platyhelminthes like the other larger flatworms, but to a different group called Acoela. Like flatworms, they are unsegmented worms.

Features: 1cm long or less. Often circular in shape and brown, sometimes with a white stripe or short white line. The brown colour comes from the symbiotic algae in their bodies.

A hard coral thickly covered
with acoel flatworms.
Sisters Island, Jun 07
What do they eat? It is believed that they graze on the edible bits that get trapped in the mucus produced by the host animals that they are found on.

Many species reproduce asexually by fragmentation.

What eats them? Among their predators are tailed slugs (Family Aglajidae).

On hard coral.
Sisters Island, Jun 07

Acoel flatworms on Singapore shores


On hard coral.
Pulau Hantu, Apr 06

On hard coral.
Tuas, Apr 05

On hard coral.
Pulau Hantu, Apr 06


On a corallimorph
St. John's Island, Jan 06

On a corallimorph
Pulau Hantu, Feb 08

Tiny spotted acoel flatworms on hard coral.
Sisters Island, Aug 08

more photos of acoel flatworms on Singapore shores
northern shores | southern shores

References
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