| Opisthonema | |
|---|---|
| |
| Opisthonema oglinum (Atlantic thread herring) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Clupeiformes |
| Suborder: | Clupeoidei |
| Family: | Dorosomatidae |
| Genus: | Opisthonema T. N. Gill, 1861 |
Opisthonema is a genus of herrings, the thread herrings, found in tropical waters of the Western Hemisphere. They get their name from a filamentous nature of the last ray of the dorsal fin. Currently, five species are in this genus.