What are the symptoms of horsehair worms? Head lice are not known to spread disease. Head lice feed on human blood several times a day and live close to the human scalp. The head louse, or Pediculus humanus capitis, is a parasitic insect that can be found on the head, eyebrows, and eyelashes of people. Within a day or two, that old horse hair will turn into a little snake that will be so wiggly that it can even tie itself into knots.” Can parasites live in your scalp? Horsehair worms, part of the taxonomic phylum Nematomorpha, are parasitic worms that resemble long thin strands of hair (hence their nickname). Adult females lay large clusters of eggs, which explains why there may be more than one worm in your toilet. These pests live off of sewage and decaying matter, which makes your toilet a perfect location for them. If you spot tiny black worms in your toilet, they are probably drain fly larvae. The adult horsehair worms are free-living in fresh water and damp soil. They may also be found on damp garden soil after a rain. Horsehair worms are also found in streams and ponds and in domestic water containers such as bird baths, swimming pools, backyard ponds and pet dishes. The “head” end (calotte) is unpigmented and only slightly set off from the rest of the body the mouth is at or near this tip. Both tips of the body are blunt and rounded. The bodies are cylindrical in cross-section (not flattened). They are not segmented like earthworms or leeches. They can attack a wide variety of insects and related animals: grasshoppers, crickets, cockroaches, beetles, and katydids, as well as dragonflies, caddisflies, millipedes, centipedes, spiders, crustaceans, leeches, snails, slugs and other invertebrates. Once they hatch, immature horsehair worms try to infect a host. Immature stages are internal parasites of grasshoppers, crickets, cockroaches, beetles, and other insects and millipedes and centipedes. Adult worms are free-living and non-parasitic. Horsehair worms are not harmful to humans, domestic animals, or plants.
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