Alex Hyde / Fly Agaric (Amanita muscaria) toadstool growing on the University of Nottingham campus, UK, November
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Jan Hamrsky / Prong-gilled mayfly nymph (Ephemeroptera, family Leptophlebiidae), crawling on stone, Europe, May, controlled conditions
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Jan Hamrsky / Prong-gilled mayfly nymph (Leptophlebiidae) and Stonefly nymph (Plecoptera), hiding in the algae at the bottom, Europe, April, controlled conditions
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Jan Hamrsky / Prong-gilled mayfly nymph (Ephemeroptera sp), swimming towards the water surface, Europe, May, controlled conditions
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MYN / Jerry Monkman / Red-gilled nudibranch (Flabellina verrucosa) Rye, New Hampshire, USA, January. meetyourneighbours.net project
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Tim Laman / Side gilled slug (Berthella martensi) on coral reef, Malapascua Island, Visayan Sea, Philippines
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Ross Hoddinott / RF- Looking up under the gills of toadstools of Porcelain fungus (Oudemansiella mucida), Cornwall, UK. (This image may be licensed either as rights managed or royalty free.)
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Constantinos Petrinos / Side-gilled slug / Seaslug {Euselenops luniceps} from above, Sulawesi, Indonesia
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George McCarthy / Freckle gilled gymnopilus toadstools {Gymnopilus penetrans} Surrey, UK
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Juergen Freund / Side gilled slug {Berthella martensi} Indo-Pacific
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Jane Burton / Common Frog (Rana temporaria) tadpoles changing from gilled to air-breathing stage, blowing bubbles at surface
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Jane Burton / Common Frog (Rana temporaria) gilled tadpoles 2/3-days-old
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Jane Burton / Common Frog (Rana temporaria) gilled tadpoles beginning to swim away from spawn
