Arrow worm, SEM

Arrow worm, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Arrow worm. Scanning electron micrograph (SEM) of an arrow worm (phylum Chaetognatha). This microscopic predatory worm is transparent or translucent and is covered by a cuticle. It has fins and a pair of hooked, chitinous, grasping spines (blue) on each side of its head, which are used in hunting. The spines are covered with a hood when swimming. Arrow worms are hermaphroditic, carrying both eggs and sperm. Some species are known to use the neurotoxin tetrodotoxin to subdue prey. Magnification: x100 when printed 10 centimetres wide.

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Keywords: 1, animal, aquatic, arrow worm, biological, biology, black background, chaetognath, fauna, invertebrate, invertebrates, marine, micro-organism, nature, one, parasite, phylum chaetognatha, plankton, planktonic, scanning electron micrograph, scanning electron microscope, sem, single, wildlife, worm, zoological, zoology, zooplankton

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