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metal prints bear metal prints anhydrobiosis metal prints aquatic metal prints organism metal prints drought resistant metal prints fresh metal prints water metal prints marine metal prints salt metal prints tardigrada metal prints tardigrades metal prints sugar metal prints extreme metal prints environment metal prints extremophile metal prints

photographs bear photos anhydrobiosis photos aquatic photos organism photos drought resistant photos fresh photos water photos marine photos salt photos tardigrada photos tardigrades photos sugar photos extreme photos environment photos extremophile photos

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Coloured scanning electron micrograph (SEM) of Tardigrade (water bear) (Echiniscus sp.). Tardigrada is an obscure phyla of invertebrates located between the nematodes (roundworms) and the arthropods (crustacea, insects, and ticks). Tardigrades are microscopic aquatic animals that need water to live. Without water they shrivel into a cask stage and survive long periods of desiccation in a stage called cryptobiosis. Tardigrades are found in marine, freshwater, and semi-aquatic terrestrial habitats. Mosses, lichens, leaf litter, soil, and even the grains of sand on a beach are examples of such habitats. They are small, 0.2-0.5 mm in length, with 5 body segments and 4 pairs of legs. They breathe through their cuticle and have a hemocoel for circulation. Water bears feed on the fluids of plant and animal cells. They have stylets which allow them to pierce plant or animal cells. Magnification x100 when shortest axis printed at 25 millimetres.

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