Square-tailed worm, light micrograph

Square-tailed worm, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Square-tailed worm. Light micrograph of a transverse section through a square-tailed worm (Eiseniella tetraedra). The outer layer of the skin is the epidermis (dark purple), which contains glands that secrete mucus to aid the worm's movement. Beneath this are layers of muscle (red). At centre is the intestine, with the typhlosole (an invagination that increases surface area) at top. The nephridia, which are similar to kidneys are brown. At bottom centre is the nerve cord (pink). Magnification: x13 when printed at 10 centimetres wide.

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Keywords: animal, annelid, biological, biology, cut out, eiseniella tetraedra, epidermis, fauna, gut, intestine, invertebrate, light micrograph, light microscope, nature, nephridia, nephridium, nerve cord, no-one, nobody, sectioned, square-tailed worm, transverse section, typhlosole, white background, wildlife, worm, zoological, zoology

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