''Paedocypris progenetica'' is a species of tiny

cyprinid Cyprinidae is a family of freshwater fish commonly called the carp or minnow family. It includes the carps, the true minnows, and relatives like the barbs and barbels. Cyprinidae is the largest and most diverse fish family and the largest ...

fish

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to the Indonesian islands of

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

and

Bintan Bintan Regency (formerly Riau Islands Regency; id, Kabupaten Kepulauan Riau) is an administrative area in the Riau Islands Province of Indonesia. Bintan Regency includes all of Bintan Island (except for the city of Tanjung Pinang which is sep ...

where it is found in peat swamps and blackwater streams. It was discovered by Singaporean ichthyologist Heok Hui Tan. He has wrote a description of the fish along with another species of the same genus called Paedocypris micromegethes. It is one of the smallest known fish in the world, together with species such as ''

Schindleria brevipinguis ''Schindleria brevipinguis'' is a species of marine fish in family Gobiidae of Perciformes. Known as the stout infantfish, it is native to Australia's Great Barrier Reef and to Osprey Reef in the Coral Sea. Anatomy ''S. brevipinguis'' is among t ...

'', with females reaching a maximum standard length of , males and the smallest known mature specimen, a female, measuring only . It held the record for the shortest known vertebrate until the frog ''

Paedophryne amauensis ''Paedophryne amauensis'' is a species of microhylid frog endemic to eastern Papua New Guinea. At in snout-to-vent length, it is considered the world's smallest known vertebrate. (See also Ecological guild.) The species was listed in the ...

'' was formally described in January 2012, while the parasitic males of the

anglerfish The anglerfish are fish of the teleost order Lophiiformes (). They are bony fish named for their characteristic mode of predation, in which a modified luminescent fin ray (the esca or illicium) acts as a lure for other fish. The luminescence ...

Photocorynus spiniceps ''Photocorynus spiniceps'' is a species of anglerfish in the family Linophrynidae. It is in the monotypic genus ''Photocorynus''. The known mature male individuals are 6.2–7.3 millimeters (0.25-0.3 inches), smaller than any other ma ...

'' are but long.

References

Paedocypris Cyprinid fish of Asia Freshwater fish of Indonesia Taxa named by Maurice Kottelat Taxa named by Ralf Britz Taxa named by Heok Hui Tan Taxa named by Kai-Erik Witte Fish described in 2006 {{Cyprinidae-stub