A zitiron, or sea knight, is a

mythological creature A legendary creature (also mythical or mythological creature) is a type of fictional entity, typically a hybrid, that has not been proven and that is described in folklore (including myths and legends), but may be featured in historical accounts ...

that has an upper body in the form of an armed knight, fused with the tail of a fish.

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* Mythological human hybrids Mermaids {{legendary-creature-stub