Folliculina ampulla O. F. Müller, 1773

Report as epibiont on bryozoans: Reported on bryozoans and hydroids from Strait of Georgia, Canada (Wailes 1943; Mccazuley & Hancock 1971).

Report as epibiont on other hosts: Ubiquitous species; reported in brackish water pond: Port Canning, West Bengal, India on hydroids (Bhatia et al. 1936). The species was also reported in the Black Sea (Gassowsky 1960) and in the Baltic Sea (Mironova et al. 2014).