Georgette Douwma / Colonial anemones (Amphianthus nitidus) with Green urn sea squirts (Didemnum molle) (Atriolum robustum). Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Nudibranch (Nembrotha cristata) climbing on a Tunicate (Polycarpa aurata) at night. This species of seaslug feeds on seasquirts. A tiny cyclopoid copepod swimming past. Yillet Yecil, Yillet Islands, M...

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

Juergen Freund / Golden sea squirt (Polycarpa aurata) West New Britain, Papua New Guinea.

Juergen Freund / Sea squirts / ascidians / tunicates on a clam, Indo-pacific

Juergen Freund / Tunicates / Ascidians / Sea squirts (Atriolum robustum) on a fan coral branch. Misool, Raja Ampat, West Papua, Indonesia.

Sue Daly / Lightbulb seasquirts / tunicates (Clavelina lepadiformis) cluster on rock, Channel Isles, UK, July

Birgitte Wilms / Nudibranch laying eggs, Indonesia

Alex Mustard / Sleepy sponge crab (Dromia dormia) climbing over a rock, carrying its sea squirt (Didemnum molle) disguise, with brittlestar. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island P...

Georgette Douwma / Kaleidoscopic image of Sea squirts or tunicates - Clavelina sp. surrounded by Atriolum robustum. Raja Ampat, West Papua, Indonesia.

David Hall / Compound ascidian (Ascidiacea sp possibly Botryllus sp). Pantar, Alor Archipelago, Indonesia.

David Hall / Compound ascidian (Ascidiacea sp possibly Botryllus sp). Pantar, Alor Archipelago, Indonesia.