Adrian Davies / Branched bur-reed (Sparganium erectum) flowering, County Meath, Republic of Ireland, July

Colin Varndell / Branched Bur-Reed (Sparganium). Little Sea, Studland, Dorset, June.

GEORGETTE DOUWMA / Yellow sea cucumbers (Colochirus robustus) on sponge, feed by catching substances in the water with its finely branched tentacles. Komdo National Park, Indonesia

Albert Lleal / Ringneck Blenny (Parablennius pilicornis) male with characteristic protrusions branched over each eye, Barcelona, Spain

Jeff Rotman / Branched Alcyonarian Coral (Siphonogoria sp.) with polyps fully extended at night. Kimbe Bay, Papua New Guinea.

Willem Kolvoort / Freshwater sponge (Spongilla lacustris) Green coloration due to presence of algae, branched structure due to very slow moving water in river Czarna Hanca, Poland

Dave Watts / Branched bur reed {Sparganium erectum} UK

Jeff Rotman / Branched stalks of Ostrich feather coral (Xenia sp) polyps opening at night, Red Sea, Egypt

Jeff Rotman / Branched arms of Red sponge {Latrunculia corticata} filter feeding at night, Red Sea, Egypt