Theo Bosboom / Common limpets (Patella vulgata) hit by a big wave from the Atlantic ocean at the coast of Crohy head, Donegal, Republic of Ireland. November 2017

Franco Banfi / Crinoids (Oxycomanthus bennetti) Menjangan Island, Bali Island, Indonesia, Pacific Ocean

Brent Stephenson / New Zealand peripatus / Velvet worm (Peripatoides novaezealandiae) spitting out a sticky trap at its prey, Kahuranaki, Hawkes Bay, New Zealand, September.

Georgette Douwma / Blue starfish (Linckia laevigata) Malaysia.

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...

Pascal Kobeh / Reef covered with Clams (Mesodesma arctatum) and Common starfish (Asterias rubens) Gulf of Saint Lawrence, Canada

Pascal Kobeh / Atlantic / Common rock crab (Cancer irroratus) on the reef in the middle of green sea urchins (Strongylocentrotus droebachiensis) Gulf of Saint Lawrence, Canada

Pascal Kobeh / Glorious flatworm (Pseudobiceros gloriosus) New Caledonia, Pacific Ocean.

Pascal Kobeh / Sea slug or nudibranch (Ardeadoris / Glossodoris cruenta) New Caledonia, Pacific Ocean.

Nigel Cattlin / English redworm (Eisenia fetida) group on muddy surface of rotting organic material. Berkshire, England, UK. April.

Nigel Cattlin / English redworm (Eisenia fetida) group on muddy surface of rotting organic material. Berkshire, England, UK. April.

Alex Mustard / Emperor shrimp (Zenopontonia rex) female rides on the back of a nudirbranch (Tambja morosa), while picking food from the seabed. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Islan...