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The life histories of the flatworm Planocera multitentaculata and the pufferfish Takifugu niphobles (at present Takifugu alboplumbeus), connected by the TTX present in the flatworm. The pufferfish ingests TTX by feeding on the flatworm egg plates (present study) and adults/young [29]. Red and black arrows indicate transfer of TTX and hatching, respectively. Horizontal gray bars represent the spawning season of the pufferfish (upper) and the toxic flatworm (lower).
