David Shale / Detail of deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

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

David Shale / Detail of deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

David Shale / Detail of deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

David Shale / Detail of deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

David Shale / Deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

David Shale / Deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

David Shale / Detail of deepsea Sea pen (Pennatulacea) from coral seamount, Indian Ocean, December 2011

Georgette Douwma / Sea Pen (Veretillum sp). This sea pen is usually only out at night, it comes out of the sand when attacked by predators. A nudibranch, Armina sp. has attached itself to the Sea pen. Rinca, Komodo Nati...

Georgette Douwma / Brittlestar (Ophiothrix sp.) on Seapen (Virgularia sp.) Rinca, Indonesia

David Shale / Brittle star {Ophiurida} on Seapen (Pennatulidae), deepsea, from the Mid-Atlantic Ridge

Juergen Freund / Striped nudibranch {Armina californica} feeding on Sea pen, Pacific, Canada

David Shale / Brittlestar (Ophiurida) with Sea Pen (Pennatulid) attached deep sea

David Shale / Sea Pen (Pennatulid), with partially retracted polyps, deep sea Atlantic ocean

David Shale / Brittlestar (Ophiurida) arms wrapped around Sea pen body (Pennatulid)deep sea

David Shale / Brittlestar (Ophiurida) attached to Sea Pen (Pennatulid), deep sea Atlantic ocean

David Shale / Brittlestar (Ophiurida) attached to Sea Pen (Pennatulid), deep sea Atlantic ocean