Tribrachium
{{Short description|Genus of sponges}}
{{Speciesbox
| image =
| image_caption =
| genus = Tribrachium
| parent_authority = Weltner, 1882
| species = schmidtii
| authority = Weltner, 1882
}}
Tribrachium is a monotypic genus of sponges belonging to the family Ancorinidae. The only species is Tribrachium schmidtii.{{cite web |title=Tribrachium Weltner, 1882 |url=https://www.gbif.org/species/5430257 |website=www.gbif.org |access-date=9 June 2021 |language=en}}