Acoelomorpha

Acoelomorpha
The acoelomorph Waminoa sp. (orange structure) on the Plerogyra sp. coral (whitish bubbles).
Scientific classification
Kingdom: Animalia
Phylum: Xenacoelomorpha
Subphylum: Acoelomorpha
Ehlers, 1985
Classes

Acoelomorpha is a subphylum of very simple and small soft-bodied animals with planula-like features that live in marine or brackish waters. They usually live between grains of sediment, swimming as plankton, or crawling on other organisms, such as algae and corals. Except for two acoel freshwater species, all known acoelomorphs are marine.