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Economic Importance
At one time, researchers were concerned terrestrial planarians might damage plants. Over time, they were deemed harmless to greenery, but then a more insidious threat appeared. Hammerhead worms have the potential to exterminate earthworm populations. Earthworms are vital because they aerate and fertilize the soil. Hammerhead worms are considered a threatening invasive species. Some methods used to control slugs also work on flatworms, however, their longterm impact on ecosystems has yet to be fully determined.
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