Juergen Freund / Sea pens (Virgularia sp) on sandy seabed, Palawan, Philippines.

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

Georgette Douwma / Purple sea pen (Virgularia gustaviana) on sandy sea bed. Rinca, Indonesia

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.

David Hall / Sea pen (Virgularia gustaviana). Komodo, Indonesia.

Pascal Kobeh / Porcelain crab ((Porcellanella triloba) living commensally on Purple sea pen (Virgularia gustaviana). Flores Sea, Indonesia.

Linda Pitkin / Short-quill sea pen (Virgularia gustaviana) Rinca, Komodo National Park, Indonesia.

Juergen Freund / Sea pen (Virgularia sp) on sandy seabed, Palawan, Philippines.

Georgette Douwma / Sea pen (Virgularia gustaviana) on sandy sea bed. Orange form, Rinca, Komodo National Park, Indonesia

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

Georgette Douwma / Purple sea pen (Virgularia gustaviana) with a Commensal shrimp (Periclimenes magnificus) on sandy sea bed. Rinca, Komodo National Park, Indonesia

Georgette Douwma / Purple sea pen (Virgularia gustaviana) on sandy sea bed. Orange form, Rinca, Indonesia