New Guinea flatworm introduced to Samoa in 1990s devastates native snails

AI digestMimile.ai EditorialAugust 22, 2026 at 09:56 AM

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New Guinea flatworm introduced to Samoa in 1990s devastates native snails

A predatory New Guinea flatworm introduced to Samoa in the 1990s to control giant African snails has instead decimated native land snail populations. The worm, which climbs trees and reproduces rapidly, has driven endemic Partula and Samoana species toward extinction. Scientists have launched captive breeding programs and imposed strict inter-island biosecurity measures to protect remaining populations.

Key Facts

The New Guinea flatworm was introduced to Samoa in the 1990s to control giant African snails.
The flatworm preys on endemic tree snails of the genera Partula and Samoana, which have no natural defense against it.
The invasion, combined with habitat loss and climate change, has made Pacific land snails the fastest declining animal group.
Scientists have started captive breeding programs for the last remaining populations.
Strict biosecurity inspections and quarantine measures are being implemented for soil, plant, and agricultural product transport between islands.

Ecological Impact

The nocturnal, fast-reproducing predator targets not only ground-dwelling organisms but also climbs trees to prey on endemic tree snails of the genera Partula and Samoana. These sensitive species, which live only in a single valley or on a single island, have no natural defense mechanism against the introduced worm. The disappearance of native snails, which decompose organic matter and drive nutrient cycling in rainforests, has disrupted ecosystem balance. The flatworm is difficult to detect due to its small size, and once established in the soil, it is impossible to completely eradicate from the region.

Conservation Response

As the disaster escalated, scientists launched captive breeding programs to save the last remaining populations. Strict biosecurity inspections and quarantine measures are being enforced on soil, plant, and agricultural product transport between islands to protect clean areas not yet reached by the predatory worm.

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New Guinea flatworm introduced to Samoa in 1990s devastates native snails

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New Guinea flatworm introduced to Samoa in 1990s devastates native snails

Key Facts

Ecological Impact

Conservation Response

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