Benthic ctenophores are relatives of the more familiar planktonic comb jellies. They are highly flattened animals that cling to algae or live as commensals on other invertebrates. They may be distinguished from both nudibranchs and flatworms by their thread-like, branched, retractile tentacles that they use to snare prey. Representative Hawaiian species:

Coeloplana willeyi CP: Airport Beach, Maui June 1, 2008

Coeloplana cf. bannwarthii on Echinothrix calamaris CP:  Black Rock, Maui May 25, 2008

Coeloplana sp. #2 CP: Hekili Point, Maui Nov. 25, 2002

For more information see:   Keoki Stender's benthic ctenophore page   Benthic ctenophores on the Sea Slug Forum   Claudia Mills' ctenophore site