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

Pascal Kobeh / Three-lobed / Painted porcelain crab (Porcellanella triloba) in a Sea pen (Pteroeides or Pennatula sp) Sulu Sea, Philippines

Franco Banfi / Porcelain crab (Porcellanella triloba) on a sea pen, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Juergen Freund / Sea pen porcelain crabs (Porcellanella triloba) in sea pen (Pteroides sp.). Lembeh Strait, North Sulawesi, Indonesia.

Georgette Douwma / Pen Crab (Porcellanella triloba) perched in Sea Pen (Virgularia sp.), from where the crab filter feeds in the current. Rinca, Indonesia. October.

Georgette Douwma / Pen Crab (Porcellanella triloba) perched in Sea Pen (Virgularia sp.). Filter feeding setae mouthparts of the crab are visible. Rinca, Indonesia, October.

Georgette Douwma / Sea pen porcelain crab (Porcellanella triloba) in Sea pen (Virgularia gustaviana) Porcelain crabs are filter feeders and climb in the sea pen to take advantage of current. When the Sea pen retreats in...

Georgette Douwma / Sea pen porcelain crab (Porcellanella triloba) in Sea pen (Virgularia gustaviana) Porcelain crabs are filter feeders and climb in the sea pen to take advantage of current. When the Sea pen retreats in...

Georgette Douwma / Pen crab (Porcellanella triloba) resting in Sea pen (Pteroeides) to feed on plankton, Rinca, Indonesia