Georgette Douwma / Burrowing sea cucumber (Neothyonidium magnum). The massive tentacular crown is the only part that is visible, the rest is buried in the sand. Feeds by picking particles out of the water with the tenta...

Solvin Zankl / Particles from calcareous sand sample: left snails, family Caecidae, upper juvenile. Right shells from juvenile Architectonicidae. Raja Ampat, Indonesia. Diagonal of frame approx. 3mm Digital focus s...

Solvin Zankl / Threads of protoplasma by foraminifera (Sagenina frondescens) on a piece of sea shell with agglutinated sand particles from Raja Ampat, Indonesia. Digital focus stacking image

Juergen Freund / Golden sea squirt / tunicate (Polycarpa aurata) showing hairs to stop large particles entering the cavity. Misool, Raja Ampat, West Papua, Indonesia.

GEORGETTE DOUWMA / Vermetid worm / Worm snail (Dendropoma maxima). Vermetid gastropods are unusual snails in that they secrete the calcareous tube in which they live. This one has a operculum. They feed by trapping part...

Georgette Douwma / Sea apple (Pseudocolochirus violaceus), a sea cucumber, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food particles. Komodo N...

Georgette Douwma / Sea apple (Pseudocolochirus violaceus), a sea cucumber, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food particles. Komodo N...

Georgette Douwma / Sea apple (Pseudocolochirus violaceus), a sea cucumber, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food particles. Komodo N...

Georgette Douwma / Sea apple (Pseudocolochirus violaceus), a sea cucumber, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food particles. Komodo N...

Georgette Douwma / Sea apple (Pseudocolochirus violaceus), a sea cucumber, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food particles. Komodo N...

Georgette Douwma / Burrowing sea cucumber (Neothyonidium magnum), buried deep in the sand, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food par...

Georgette Douwma / Burrowing sea cucumber (Neothyonidium magnum), buried deep in the sand, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food par...

Georgette Douwma / Burrowing sea cucumbers (Neothyonidium magnum) one white and one black, buried deep in the sand, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its...

Georgette Douwma / Burrowing sea cucumber (Neothyonidium magnum), buried deep in the sand, feeds by filtering the water column with its tentacular crown, successively bringing each arm into its mouth to deliver food par...

Philippe Clement / Mountain stream in the Alps with meltwater from a glacier, called glacier milk because the water contains particles of rock and minerals from the grinding action of the glacier, Italy

Yva Momatiuk & John Eastcott / Sand dunes of fine gypsum particles textured by wind and hiker's footprints, changing winds form cross-grooves, evening, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Sand dunes of fine gypsum particles textured by wind, changing winds form cross-grooves, evening, White Sands National Park, New Mexico

Yva Momatiuk & John Eastcott / Sandstone walls of slot canyon are gouged, sculpted, and polished by rushing underground rivers and sand particles, Arizona

Norbert Wu / Sea Star (Odontaster sp) climbing up the stalk of a Feather Duster Worm (Perkinsiana sp) uses feathery gills to filter seawater for food particles, Antarctica

Norbert Wu / Sponge (Rossella fibulata) primitive animal colonies that filter water for food particles, Antarctica

Norbert Wu / Volcano Sponge (Anoxycalyx joubini) pair primitive animal colonies that filter water for food particles, Antarctica

Norbert Wu / Feather Duster Worm (Perkinsiana sp) in seafloor community, use their feathery gills to fan water for food particles, Antarctica

Norbert Wu / Sea Anemone (Urticinopsis antarctica) feeding by licking food particles off a tentacle, mouth is in center of tentacles, Antarctica

David Shale / Deep sea Benthic polychaete on seabed - has thousands of sticky tentacles to which food particles ahdere. Gulf of Mexico, Atlantic Ocean

Christian Ziegler / Small leaf particles protect the soil under them from erosion, creating tiny pyramids of protected soil, Barro Colorado Island, Panama

Yva Momatiuk & John Eastcott / Sand dunes of fine gypsum particles textured by wind and hiker's footprints, changing winds form cross-grooves, evening, White Sands National Park, New Mexico