Diplozoon paradoxum

Rarity: Common

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What Wikipedia says

Diplozoon paradoxum is a flatworm (platyhelminth) from the class Monogenea. It is found in freshwater fishes in Asia and Europe and known for its complete monogamy. This parasite is commonly found on the gills of European cyprinid fishes.

Excerpt from the Wikipedia article “Diplozoon paradoxum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ernst Haeckel, Public domain, via Wikimedia Commons.