Sio (genus)

Sio is a monotypic genus of fish in the family Melamphaidae, the ridgeheads. The only species is Sio nordenskjoldii, or Nordenskjold's bigscale. It has a circumglobal distribution on the southern hemisphere at depths from 200 to 3000 m.

Etymology
The genus names refers to the Scripps Institute of Oceanography, abbreviated as SIO.

Description
This species grows to a length of 12.3 cm SL.

Conservation
There are no known threats to this species. It is not caught by commercial fisheries.