Mesocyprinus micristius (Regan, 1906) Cyprinus micristius, the Dianchi carp, is a critically endangered species of ray-finned fish in the family Cyprinidae.

It is found only in Lake Dianchi and its tributaries in Yunnan, China.

[1] The nominate subspecies from the lake itself has not been confirmed since the 1960s.

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