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Mesenterial Filament. mesenterial filament: a thickened rim or ribbon-like extension running along the free border of a mesentery from the end of the actinopharynx downwards. They aid in the capture and digestion of food materials and may also assist in inhibiting substrate competitors.
The Mesenteric Filaments originate from the laterally arranged mesenteries (which increase surface area for digestion) on the internal edge of the coral oral disc or stomach and contain nematocysts. These filaments can protrude from the mouth or even from temporary opens in the side of the column (this is most clearly seen with Aiptasia sp.). Some coral species use the mesenteric filaments as a way to compete with neighbouring corals for space (see Coral Competition) and cleaning the substrate for their subsequent colonisation. Function