| Monobrachium | |
|---|---|
 | |
| A colony of hydrozoan Monobrachium parasitum on the Macoma calcarea shell. | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Cnidaria |
| Class: | Hydrozoa |
| Order: | Limnomedusae |
| Family: | Monobrachiidae Mereschkowsky, 1877 |
| Genus: | Monobrachium Mereschkowsky, 1877 |
Monobrachium is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae.
