True fish possess gills and fins. Which one of the following is not a true fish?

Carassius

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Hythalamincthyes

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Hippocampus

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Lepisma

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Solution

The correct option is D Lepisma
Carassius is a genus in the ray-finned fish family Cyprinidae.
Hippocampus is the name of marine fishes in the genus Hippocampus.
While Lepisma is a genus of primitive insects.
So, the correct answer is option D.

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