Juergen Freund / Sea pen octocoral (Veretillum sp) with polyps out, feeding, Misool, Raja Ampat, West Papua, Indonesia

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 / Loki whip goby (Bryaninopss loki) on Sea pen (Virgularia gustaviana). Komodo National Park, Indonesia