Megasiphon
| Megasiphon thylakos Temporal range:  | |
|---|---|
| Type specimen of M. thylakos | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Subphylum: | Tunicata | 
| Genus: | †Megasiphon Nanglu et al., 2023 | 
| Species: | †M. thylakos | 
| Binomial name | |
| †Megasiphon thylakos Nanglu et al., 2023 | |
Megasiphon thylakos is an extinct species of tunicate that lived in the Middle Cambrian 500 million years ago.