Sinogastromyzon tonkinensis is a species of ray-finned fish in the genus Sinogastromyzon.

It is endemic to the Red River drainage in northern Vietnam and Yunnan, southern China.

[1][2] It grows to 3.8 cm (1.5 in) SL.

[2] Very little is known about ecology of this species that is used in some subsistence fisheries.

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