Xenisthmus chi
Encyclopedia
Xenisthmus chi is a species of fish in the wriggler family, Xenisthmidae
. 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.
Xenisthmidae
Collared Wrigglers are perciform fishes in the family Xenisthmidae. They are native to the Indian and Pacific oceans, where they are mostly reef-dwelling...
. Japan wrigglers are tiny and clear. Before Paedocypris progenetica
Paedocypris progenetica
Paedocypris progenetica is a species of cyprinid fish endemic to Indonesia where it is found in peat swamps and blackwater streams. It is one of the smallest vertebrates in the world with females reaching a maximum size of 10.3 mm, males 9.8 mm and the smallest mature specimen, a female, measured...
and the dwarf goby (Pandaka pygmaea
Pandaka pygmaea
The dwarf pygmy goby is a tropical freshwater fish of the family Gobiidae. It is one of the smallest fish in the world by mass, and is also one of the shortest freshwater fish. Mature males can reach up to 1.1 cm, while the females can grow up to 1.5 cm. Average weight is from 4 to 5 mg...
) were discovered, the Japan wriggler was the smallest known fish.