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absorptive feeder

A parasitic tapeworm is an absorptive feeder. The narrowest point is the "head" or scolex which attaches the parasite to the intestinal lining by means of suckers and/or little hooks. Predigested nutrients are absorbed through the wall of each of the progressively larger segments. These animals have no digestive canal.
An absorptive feeder is an animal, such as a tapeworm, that ingests food through its body wall.

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Source: NOAA