Georgette Douwma / Valentine's puffer (Canthigaster valentini) with Golden sea squirts (Polycarpa aurata) Lembeh, Sulawesi, Indonesia.

Georgette Douwma / Sea squirts: Golden sea squirt (Polycarpa aurata) and Blue club tunicate (Rhopalaea crassa) Lembeh, Sulawesi, Indonesia.

Constantinos Petrinos / Chromodorid nudibranch (Chromodoris annae) on Sea Squirt (Polycarpa aurata) Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Slender sapsucking slug (Thuridilla gracilis) on surface of Royal seasquirt (Polycarpa aurata) Aljui Bay, Waigeo Island, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean.

Solvin Zankl / Rich reef landscape with Ox heart ascidian (Polycarpa aurata) and Reef fish, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Solvin Zankl / Ox heart ascidian (Polycarpa aurata) Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Juergen Freund / Soft corals (Alcyonacea) and Ox-heart ascidians(Polycarpa aurata). Raja Ampat coral reef. Raja Ampat, West Papua, Indonesia

Georgette Douwma / Hingebeak shrimp (Rhynchocinetes durbanensis) with sea squirts (Polycarpa aurata). Rinca, Komodo National Park, Indonesia.

Chris Newbert / Ink-spot Ascidian (Polycarpa aurata) tunicate, Indonesia

Georgette Douwma / Sea Squirts (Polycarpa aurata) with soft corals and other invertebrates. Raja Ampat, Indonesia.

Georgette Douwma / Bath's Comb-tooth (Ecsenius bathi) on Sea Squirt (Polycarpa aurata). Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Tailspot Blennie (Ecsenius stigmatura) at rest on seasquirt (Polycarpa aurata). Raja Ampat, West Papua, Indonesia.