Sessile Hydrozoan

Halecium tenellum

• Group: Other
• Typical depth: 0–1046 m

This small hydroid attaches to hard surfaces across an enormous depth range, from mangrove roots in the shallows to seamount tops more than a kilometre down. It grows as a delicate branching colony, filtering plankton from the passing water.

Taxonomy: Animalia › Cnidaria › Hydrozoa › Leptothecata › Haleciidae › Halecium

Species data via the World Register of Marine Species (WoRMS), AphiaID 117606.