| Rhynchohyalus | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Argentiniformes |
| Family: | Opisthoproctidae |
| Genus: | Rhynchohyalus Barnard, 1925 |
| Species: | R. natalensis
|
| Binomial name | |
| Rhynchohyalus natalensis | |
Rhynchohyalus natalensis, the glasshead barreleye, is a species of barreleye found in oceans around the world at depths from 247 to 549 metres (810 to 1,801 ft). This species grows to a length of 16 centimetres (6.3 in) SL. It and the brownsnout spookfish are the only vertebrates known to employ mirrors, in addition to lenses, to focus the images in its eyes.[citation needed] This fish, apart from its fluid filled dome and its mirrors, has four eyes that can see in 360°.[citation needed]