Hydroids [Hydrozoa]

Description

Hydroids can look like delicate, branching “miniature forests” or feathery tufts attached to rocks, wrecks, or floating structures. Many species are colonial, and divers might notice them swaying gently in the current as tiny polyps capture food.

Families

Lobed comb jellies (deepwater ctenophores)

Trachylinae

Taxonomy