| Sio nordenskjoldii | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Division: | Teleostei |
| Order: | Beryciformes |
| Family: | Melamphaidae |
| Genus: | Sio Moss, 1962 |
| Species: | S. nordenskjoldii |
| Binomial name | |
| Sio nordenskjoldii (Lönnberg, 1905) | |
| Synonyms | |
|
Melamphaes (Plectromus) nordenskjoldii Lönnberg, 1905 | |
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 3,000 metres (660 to 9,840 ft).
The genus names refers to the Scripps Institute of Oceanography, abbreviated as SIO.
This species grows to a length of 12.3 centimetres (4.8 in) SL.
There are no known threats to this species. It is not caught by commercial fisheries.