Xenisthmus chi (Japan wriggler, chi xenisthmid) is a species of fish in the wriggler family, Xenisthmidae, which is regarded as a synonymous with the Eleotridae,.

[1] Japan wrigglers are tiny and clear.

Before Paedocypris progenetica and the dwarf goby (Pandaka pygmaea) were discovered, the Japan wriggler was the smallest known fish.

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