Macrophotograph of an arrow worm (Chaetogna

Macrophotograph of an arrow worm (Chaetogna

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Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Arrow worm. Macrophotograph of an arrow worm, Chaetognatha phylum, a type of marine mollusc found in plankton. The worm's head is at lower left and its tail at upper right. The arrow worm feeds on plankton, capturing other organisms with a set of claws in the head. They mostly live in the surface levels of the oceans of the world, though some species have adapted to a deeper existence. Arrow worms are an example of a "living fossil", having remained virtually unchanged for millions of years. There is little diversity in the Chaetognatha phylum, which only contains about fifty species split into seven genera. Magnification: x7 at 35mm size.

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Keywords: animal, arrow worm, arrow-worm, arrow-worms, chaetognatha, fossil, invertebrates, living, living fossil, mollusca, nature, plankton, wildlife, zoology

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