Xenisthmus chi

Description

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,. 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.