See text Hydractinia is a genus of commensal athecate hydroids which belong to the family Hydractiniidae.

Hydractinia species mostly live on hermit-crabbed marine gastropod shells.

One species, Hydractinia echinata, is commonly known as snail fur.

[1] Another species, H. minoi, is known to be commensal with stingfishes of the genus Minous.

This Anthoathecata-related article is a stub.