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    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Amoeba shell. Coloured scanning electron micrograph (SEM) of a shell from a Euglypha sp. amoeba. — Stock Photo
    Amoeba shell. Coloured scanning electron micrograph (SEM) of a shell from a Euglypha sp. amoeba.
    France, Les Moutiers-en-Retz, 44, barnacles hanging on a beacon stranded on the beach after a storm. — Stock Photo
    France, Les Moutiers-en-Retz, 44, barnacles hanging on a beacon stranded on the beach after a storm.
    Lysmata late stage zoea larva under water during a blackwater dive off the Kona coast, the Big Island; Island of Hawaii, Hawaii, United States of America — Stock Photo
    Lysmata late stage zoea larva under water during a blackwater dive off the Kona coast, the Big Island; Island of Hawaii, Hawaii, United States of America
    Close-up of hummingbird hawkmoth on yellow lichens covered branch. — Stock Photo
    Close-up of hummingbird hawkmoth on yellow lichens covered branch.
    Hookworm head anatomy — Stock Photo
    Hookworm head anatomy
    Bee fly sitting on rose rhapsody flower. — Stock Photo
    Bee fly sitting on rose rhapsody flower.
    Young girl with flowers — Stock Photo
    Young girl with flowers
    Wheat stink bug walking on wheat plant. — Stock Photo
    Wheat stink bug walking on wheat plant.
    Translucent shrimp crawling on bubble coral — Stock Photo
    Translucent shrimp crawling on bubble coral
    Close-up of flesh fly perched on dried wild plant. — Stock Photo
    Close-up of flesh fly perched on dried wild plant.
    Parasitic tick biting skin — Stock Photo
    Parasitic tick biting skin
    Close-up of Spanish fly perched on fresh wild plant. — Stock Photo
    Close-up of Spanish fly perched on fresh wild plant.
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation — Stock Photo
    Liver fluke. Computer illustration of adult liver fluke (Fasciola hepatica), parasite of sheep, cattle and humans. Humans ingest fluke larvae by eating infested vegetation
    Wings of the 'Giant Red Winged Hopper'; a grasshopper (Tropidacris dux) from Peru — Stock Photo
    Wings of the 'Giant Red Winged Hopper'; a grasshopper (Tropidacris dux) from Peru
    Phyllidia varicosa nudibranch — Stock Photo
    Phyllidia varicosa nudibranch
    Clark anemonefish in tentacles of anemone — Stock Photo
    Clark anemonefish in tentacles of anemone
    Colorful harlequin bug sitting on thin plant branch. — Stock Photo
    Colorful harlequin bug sitting on thin plant branch.
    Robberfly insect eyes and antennas, detailed portrait. — Stock Photo
    Robberfly insect eyes and antennas, detailed portrait.
    Goby with eggs on tunicate — Stock Photo
    Goby with eggs on tunicate
    Nudibranch feeding on sponge — Stock Photo
    Nudibranch feeding on sponge
    Blue starfish on sandy seafloor — Stock Photo
    Blue starfish on sandy seafloor
    Crinoid sea lily fossil in gray rock surface. — Stock Photo
    Crinoid sea lily fossil in gray rock surface.
    Close-up of tachinid fly perched on wild plant. — Stock Photo
    Close-up of tachinid fly perched on wild plant.
    France, Arcachon bay, seafood platter — Stock Photo
    France, Arcachon bay, seafood platter
    Close-up of Idas blue butterfly on dried spike. — Stock Photo
    Close-up of Idas blue butterfly on dried spike.
    Crinoid and tunicates covering shallow reef — Stock Photo
    Crinoid and tunicates covering shallow reef
    Cardinalfish swimming over soft corals — Stock Photo
    Cardinalfish swimming over soft corals
    Parasitic louse on human head skin, digital illustration. — Stock Photo
    Parasitic louse on human head skin, digital illustration.
    Tent caterpillar on green plant stem, close-up — Stock Photo
    Tent caterpillar on green plant stem, close-up
    Close-up of devils coach horse beetle with large mandibles. — Stock Photo
    Close-up of devils coach horse beetle with large mandibles.
    Soft coral colonies growing on reef — Stock Photo
    Soft coral colonies growing on reef
    Coconut octopus on sandy seafloor — Stock Photo
    Coconut octopus on sandy seafloor
    Sea whips and corals — Stock Photo
    Sea whips and corals
    Pair of nudibranchs feeding on algae — Stock Photo
    Pair of nudibranchs feeding on algae
    Halgerda batangas nudibranch — Stock Photo
    Halgerda batangas nudibranch
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract. — Stock Photo
    Digital illustration showing close-up of ciliate protozoan Balantidium coli intestinal parasite causing balantidiasis ulcer in human intestinal tract.
    Close-up of colourful female tachinid fly on wild plant. — Stock Photo
    Close-up of colourful female tachinid fly on wild plant.
    Chromodoris kuniei nudibranch — Stock Photo
    Chromodoris kuniei nudibranch
    Pteraeolidia ianthina nudibranch — Stock Photo
    Pteraeolidia ianthina nudibranch
    Adult parasitic louse — Stock Photo
    Adult parasitic louse
    Digital illustration of parasitic hookworm Ancylostoma duodenale in small intestine. — Stock Photo
    Digital illustration of parasitic hookworm Ancylostoma duodenale in small intestine.
    Blister beetle eating on a milkweed plant in a garden — Stock Photo
    Blister beetle eating on a milkweed plant in a garden
    Dust mite on skin surface — Stock Photo
    Dust mite on skin surface
    Phyllidia varicosa nudibranch — Stock Photo
    Phyllidia varicosa nudibranch
    Loch Chromodoris nudibranch closeup shot — Stock Photo
    Loch Chromodoris nudibranch closeup shot
    Mating Nembrotha chamberlaini nudibranchs — Stock Photo
    Mating Nembrotha chamberlaini nudibranchs
    Risbecia tryoni nudibranch in Beqa Lagoon — Stock Photo
    Risbecia tryoni nudibranch in Beqa Lagoon
    Yellow sea fan in Raja Ampat — Stock Photo
    Yellow sea fan in Raja Ampat
    Tapeworm of cattle and other grazing animals, light micrograph. — Stock Photo
    Tapeworm of cattle and other grazing animals, light micrograph.
    A tentaculate ctenophore, also known as comb jelly or sea gooseberry (Pleurobrachia sp.), opening its mouth to ingest zooplankton prey during a blackwater dive off the Kona coast, the Big island; Island of Hawaii, Hawaii, United States of America — Stock Photo
    A tentaculate ctenophore, also known as comb jelly or sea gooseberry (Pleurobrachia sp.), opening its mouth to ingest zooplankton prey during a blackwater dive off the Kona coast, the Big island; Island of Hawaii, Hawaii, United States of America
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork. — Stock Photo
    Giardia lamblia single-celled protozoan parasite in human duodenum, digital artwork.
    Gorgonian sea fan and tiger cowrie — Stock Photo
    Gorgonian sea fan and tiger cowrie
    Giant anemone, fuerteventura canary islands — Stock Photo
    Giant anemone, fuerteventura canary islands
    Tiger beetle in detailed portrait shot. — Stock Photo
    Tiger beetle in detailed portrait shot.
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Parasitic head louse on human hair — Stock Photo
    Parasitic head louse on human hair
    Human head louse — Stock Photo
    Human head louse
    Close-up of Aphid body infected by parasitic wasp on grass with dew drops. — Stock Photo
    Close-up of Aphid body infected by parasitic wasp on grass with dew drops.
    Hydatid disease in liver, cystic echinococcosis, Computer illustration — Stock Photo
    Hydatid disease in liver, cystic echinococcosis, Computer illustration