David Hall / A Giant rock scallop (Crassadoma gigantea) encrusted with and surrounded by several other invertebrates, including White anemones (Metridium sp.), White mushroom ascidians (Distaplia sp.), Red soft co...

Ross Hoddinott / Close-up of the gills of a group of small mushrooms (unidentified), north Cornwall, UK. November 2017.

Tim Laman / Mouse (Mus ? Apodemus ?). New, unidentified species found at 1650 m in the Foja Mountains. Papua, Indonesia, 2008. (taken during Conservation International Rapid Assessment Program expedition)

Alex Hyde / Close-up of compound eyes of unidentified fly {Diptera}. Masoala Peninsula National Park, north east Madagascar.

Inaki Relanzon / Unidentified caterpillar feeding on leaf, Sambava, North Madagascar.

Kim Taylor / Tropical beetle (unidentified) Trinidad, West Indies.

Kim Taylor / Giant millipede {unidentified} Namibia.

Kim Taylor / Ants (unidentified) feeding on spilt honey. UK.

Pete Oxford / Feather mimic caterpillar found in Macipucuna Cloudforest Andes, Ecuador, South America. Unidentified species

Piotr Naskrecki / Eggs of an unidentified insect, Guinea, West Africa

Mateusz Piesiak / Oak leaves (Quercus robur) with unidentified spider and a plant seedling, photographed on a rainy autumn day. Barycz Valley Landscape Park, Poland, November..

Magnus Lundgren / Wild Wonders of China / Small coral grouper, unidentified, Green Island, Taiwan.

Alex Mustard / Limpets / Common limpet (Patella vulgata) and acorn barnacles (unidentified) on red rocks. St Brides Haven, Pembrokeshire, Wales, United Kingdom. Irish Sea.

Sirachai Arunrugstichai / Freshwater crab species (unidentified), burrows into the substrate in the root system of a tree at Tha Pom Khlong Song Nam, Krabi Province, Thailand

David Perpinan / Rack focus between Non-biting chironomid midges (Chironomidae) and Mosquito larva (Culex sp.) on the water's surface and unidentified Polychaetes underwater, Barcelona, Spain, May. Controlled conditio...

Georgette Douwma / DELETE Unidentified brittlestar on a crinoid. Lembeh Strait, North Sulawesi, Indonesia.

Fred Olivier / Scientists measuring a deep water fish (unidentified) capture during a deep trawl in the Southern Ocean, February 2015

Magnus Lundgren / Unidentified comb jelly (Ctenophora) Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean Magnus

David Hall / Gooseneck barnacles (Pollicipes polymerus) found only at Nakwakto Rapids, which has one of the strongest tidal currents in the world. Also seen are Vancouver featherduster worms (Eudistylia vancouveri...

David Hall / Split level shot of kelp and other 'seaweeds' partly exposed at low tide, with coniferous forest in the background. Seen in this photograph are the following: Turkish washcloth (Mastocarpus pa...

Magnus Lundgren / Wild Wonders of China / Red unidentified pelagic squid, 14 cm long, showing distinctive chromatophores, Kenting National Park, Kenting, Taiwan. Lundgren

Magnus Lundgren / Wild Wonders of China / Red unidentified pelagic squid, 14 cm long, showing distinctive chromatophores in Kenting National Park, Kenting, Taiwan. Lundgren

Magnus Lundgren / Wild Wonders of China / Free swimming and drifting unidentified nudibranch. Possibly a Melibe nudibranchs that is an active predator eating free-swimming animals such as small crustaceans, using its extendable oral hood. Gre...

Magnus Lundgren / Small unidentified squid juvenile, only 20mm long hovering in the night in mid water. Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Wild Wonders of China / Unidentified wrasse, juvenile, only 15 mm, Kenting National Park, Kenting, Taiwan. Lundgren

Magnus Lundgren / Unidentified juvenile eel (only 3.5 cm) curled up to confuse predators, Balayan Bay, Luzon, the Philippines Magnus

Magnus Lundgren / Wild Wonders of China / Unidentified transparent juvenile nudibranch drifting ans swimming in the open ocean, Green Island, Taiwan. Lundgren

Magnus Lundgren / Wild Wonders of China / Unidentified squid (Teuthida sp.) photographed at night, Kenting National Park, Taiwan. Lundgren

Magnus Lundgren / Unidentified juvenile eel or Moray eel photographed at night, Balayan Bay, Luzon, Philippines. The eel is curled up to confuse predators, and its transparent body helps it look less conspicuous. Magnu...

Shane Gross / A small (1cm) unidentified fish hiding inside a pelagic tunicate. Image made in the Sargasso Sea, an area in the Atlantic ocean in International Waters.

Shane Gross / Rare deep water fish called a Swallower. Exact species unidentified. Sargasso Sea, Atlantic Ocean.

Shane Gross / An unidentified species of flying fish in the Sargasso Sea in the middle of the Atlantic ocean, International Waters.

MYN / Joao P. Burini / Unidentified moth (Lepidoptera) Atlantic forest Itatiaia National Park, Brazil. Meetyourneighbours.net project.

MYN / Joao P. Burini / Unidentified moth (Lepidoptera) Atlantic forest, Itatiaia National Park, Brazil. Meetyourneighbours.net project.

Shane Gross / Yet-to-be-described red cave shrimp scavenges on a dead, unidentified crab in a blue hole in The Bahamas. To avoid competition, the shrimp rises off the bottom to feed.

Georgette Douwma / Unidentified mushroom coral, Lembeh Strait, North Sulawesi, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis) unidentified unflanged adult male, Batang Toru Forest, Sumatran Orangutan Conservation Project North Sumatran Province, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis) unidentified unflanged adult male, Batang Toru Forest, Sumatran Orangutan Conservation Project North Sumatran Province, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis) unidentified unflanged adult male, Batang Toru Forest, Sumatran Orangutan Conservation Project North Sumatran Province, Indonesia.

Alex Hyde / Unidentified moth caterpillar covered in defensive urticating hairs. Manu Biosphere Reserve, Amazonia, Peru. November.

Ross Hoddinott / Close-up of the gills of a group of small mushrooms (unidentified) north Cornwall, UK. November. Highly commended in the Wild Woods Category of the BWPA (British Wildlife Photographer of the Year Awar...

Alex Mustard / Mysid shrimps (unidentified) swarm above the seabed in a current. Seraya, Tulamben, Bali, Indonesia. Java Sea

Emanuele Biggi / Ant (Cephalotes atratus) on the right, fighting with another unidentified ant, Los Amigos Biological Station, Peru

Mark Taylor / Alpine succulent plant (unidentified) Los Alerces National Park UNESCO World Heritage Site, Argentina.

Kim Taylor / Fly (unidentified) head detail. Surrey, England. Digitally enhanced

LYNN M. STONE / RF - Free-range rooster (breed: Polish) and hen of unidentified breed, foraging. Moosup, Connecticut, USA. (This image may be licensed either as rights managed or royalty free.)

Paul D Stewart / Illustrations of Southern, Eastern and Spanish Festoon butterfly (Zerynthia spp.) by an unidentified European Artist, 1875.

Alex Hyde / Fungal mycelium from an unidentified species of fungus, growing across a decomposing leaf. The mycelium is the vegetative part of the fungus and is made up of a mass of thread-like hyphae. Osa Peninsu...