Sue Daly / Nudibranch (Flabellina gracilis) feeding on bryozoan (Membranipora membranacea), Trondheimsfjord, Norway, July.

SCOTLAND: The Big Picture / Monkey puzzle bryozoan (Omalosecosa ramulosa) on seafloor, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

SCOTLAND: The Big Picture / Monkey puzzle bryozoan (Omalosecosa ramulosa) on seafloor, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

Sue Daly / Nudibranch (Polycera quadrilineata) feeding on bryozoan Sea mat (Membranipora membranacea) St Abbs Voluntary Marine Reserve, Scotland (North Sea).

Sue Daly / Ross Bryozoan (Pentapora fascialis) L'Etac, Sark, British Channel Islands.

Lewis Jefferies / Common hermit crab (Pagurus bernhardus) in Painted topshell, resting on Golden kelp (Laminaria ochroleuca) frond, encrusted with Lacy crust bryozoans (Membranipora membranacea), Lizard Peninsula, Corn...

Lewis Jefferies / Spiney squat lobster (Galathea strigosa) resting at night on Golden kelp (Laminaria ochroleuca) frond covered in Seamat (Membranipora membranacea), Lizard Peninsula, Cornwall, UK, Atlantic Ocean.

Joel Sartore / Photo Ark / Two Sand disc bryozoans (Discoporella doma), one with a Calcareus tube worm (Hydroides crucigera) and Encrusting sand tube worm (Sabellaria sp.) sheltering inside, Gulf Specimen Marine Lab and Aquariu...

Joel Sartore / Photo Ark / Two Sand disc bryozoans (Discoporella doma), one with a Calcareus tube worm (Hydroides crucigera) and Encrusting sand tube worm (Sabellaria sp.) sheltering inside, Gulf Specimen Marine Lab and Aquariu...

Alex Mustard / Purple and pink Nudibranch (Edmundsella pedata), with mouth visible, crawling over Square-end hornwrack (Chartella papyracea), Swanage, Dorset, UK, English Channel.

Alex Mustard / Clingfish (Diplecogaster sp.) curled up next to Sea lace (Membranipora membranacea) growing on a kelp blade. Lochcarron, Ross-shire, Ross and Cromarty, Highlands, Scotland, United Kingdom. British Isl...

Franco Banfi / Violescent sea-whip or Red sea fan (Paramuricea clavata) with bryozoans (Sertella septentrionalis and Pentapora fascialis), Punta Campanella Marine Protected Area, Amalfi Coast, Italy, Tyrrhenian Sea,...