Monobrachium

{{Short description|Genus of hydrozoans}}

{{Automatic taxobox

| image = Monobrachium parasitum.png

| image_caption = A colony of hydrozoan Monobrachium parasitum on the Macoma calcarea shell.

| parent_authority = Mereschkowsky, 1877

| taxon = Monobrachium

| authority = Mereschkowsky, 1877[http://www.marinespecies.org/aphia.php?p=taxdetails&id=117174&allchildren=1 World Register of Marine Species] Retrieved July 10, 2012

}}

Monobrachium is a genus of hydroids. These marine cnidarians form the only genus of the monotypic family Monobrachiidae.