| Opisthonema | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Clupeiformes |
| Family: | Clupeidae |
| Genus: | Opisthonema T. N. Gill, 1861 |
Opisthonema, the thread herrings, is a genus of herring found in tropical waters of the Western Hemisphere. They get their name from a filamentous nature of the last ray of the dorsal fin. There are currently five members of this genus.