A parasitic flatworm (trematode) with two mouth-like openings, one at each end of the body.
From Greek amphi- (both sides) + stoma (mouth). The term was coined in the 19th century to describe these dual-opening parasites discovered in animal hosts.
These worms are biological marvels of symmetry—having functional mouths at both ends means they can feed and reproduce with remarkable efficiency, making them successful parasites in fish and reptiles for millions of years.
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