Alex Mustard / 2020VISION / Phosphorescent Seapen (Pennatula phosphorea) extends out of the muddy seabed in the calm waters of the upper reaches of a Scottish sea loch. Loch Duich, Ross and Cromarty, Scotland, UK, April

Albert Lleal / Sea Pen (Pennatula sp) tentacles made up of polyp colony, Spain

Roberto Rinaldi / A sea pen (Pennatula sp.) on sandy seabed in the coral sea, Flinders Reef, Australia