what are the three groups of segmented worms?
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Annelids, or segmented worms, are grouped into the classes oligochaeta, polychaeta, and hirudinea.
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echinoderms, chordates, hemichordates, protostomes, Ecdysozoa \nLophotrochozoa \nPlatyzoa
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It depends on the kind of worm, and even on the particular worm! Many worms go on adding segments as a way to grow. Here's all kinds of info on the wormy-ones:
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nvertebrates are an extraordinarily diverse group of animals that include over 30 phyla. Invertebrates do not have a backbone, nor a bony skeleton. This large group of animals includes sponges, cnidarians, flatworms, roundworms, segmented worms, mollusks, echinoderms, and arthropods.\nSubtopics\nArthropods (290) Flatworms (6) Cnidarians (6) Mollusks (9) Echinoderms (7) Segmented Worms (5)
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It is called regeneration. Worms can do it because they have more than one heart. If you separate the worm a part with a heart in it will keep living.\n\n-Trey
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The annelids (the animal phylum that includes earthworms) have a closed blood/vascular system but they use extracellular digestion, thus the blood is used as a respiratory fluid but not for nutrient delivery or waste transport. Annelids are segmented worms with a body made of repeating segments. Typically each segment has a pair of nephridial tubules to filter waste from the coloemic fluid. The real specialty of this group is that they use the coloemic fluid as a specialized hydraulic drive. The body segments are separated by septa which are used as valves to allow peristaltic movement and burrowing.
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A fake Zoomer black worm.-Largemouth\n\nOr just use a live earthcrawler.-Smallmouth
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Kingdom: Protista\nPhylum: Amoebozoa\nFamily: Amoebidae\nGenus: Amoeba
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http://en.wikipedia.org/wiki/Parelaphostrongylus_tenuis\n\nMorphology\n\nRoundworms are triploblastic protostomes with a complete digestive system. Roundworms have no circulatory or respiratory systems so they use diffusion to breathe and for circulation of substances around their body. They are thin and are round in cross section, though they are actually bilaterally symmetric. Nematodes are one of the simplest animal groups to have a complete digestive system, with a separate orifice for food intake and waste excretion, a pattern followed by all subsequent, more complex animals. The body cavity is a pseudocoel (persistent blastula), which lacks the muscles of coelomate animals used to force food down the digestive tract. Nematodes thus depend on internal/external pressures and body movement to move food through their digestive tracts. The mouth is often surrounded by various flaps or projections used in feeding and sensation. The portion of the body past the anus or cloaca is called the "tail." The epidermis secretes a layered cuticle made of keratin that protects the body from drying out, from digestive juices, or from other harsh environments, as well as in some forms sporting projections such as cilia that aid in locomotion. Although this cuticle allows movement and shape changes via a hydrostatic skeletal system, it is very inelastic so does not allow the volume of the worm to increase. Therefore, as the worm grows, it has to moult and form new cuticles. The cuticles don't allow volume to increase so as to keep hydrostatic pressure inside the organism very high. For this reason, the roundworms do not possess circular muscles (just longitudinal ones) as they're not required. This hydrostatic pressure is the reason the roundworms are round.\nMost free-living nematodes are microscopic, though a few parasitic forms can grow to several meters in length. There are no circular muscles, so the body can only undulate from side to side. Contact with solid objects is necessary for locomotion; its thrashing motions vary from mostly to completely ineffective at swimming.\nRoundworms generally eat bacteria, algae, fungi and protozoans, although some are filter feeders. Excretion is through a separate excretory pore.\nReproduction is usually sexual. Males are usually smaller than females (often very much smaller) and often have a characteristically bent tail for holding the female for copulation. During copulation, one or more chitinized spicules move out of the cloaca and are inserted into genital pore of the female. Amoeboid sperm crawl along the spicule into the female worm.\nEggs may be embryonated or unembryonated when passed by the female, meaning that their fertilized eggs may not yet be developed. In free-living roundworms, the eggs hatch into larva, which eventually grow into adults; in parasitic roundworms, the life cycle is often much more complicated.\nRoundworms have a simple nervous system, with a main nerve cord running along the ventral side. Sensory structures at the anterior end are called amphids, while sensory structures at the posterior end are called phasmids.\n\nhttp://en.wikipedia.org/wiki/Nematode\n\n\nHope that helps!
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See the link and scroll down to "earthworm" for an interesting discussion of its segments and what they do.  One segment has the brain which controls movement.  Good luck.
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Technically speaking, it is called the vermiform appendix.  Vermi refers to worm and if you look at an appendix, you will see that it looks quite a bit like a worm.
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Try this site.  It has a lot of information including a diagram:\n\nhttp://www.ucmp.berkeley.edu/phyla/ecdysozoa/nematoda.html
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Shedding some light on Earthworms.
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trichamonis vaginalis or some other parasite
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Most likely booklice (don't worry, they are not really lice).\n\nhttp://ohioline.osu.edu/hyg-fact/2000/2080.html\n\nhttp://www.ext.vt.edu/departments/entomology/factsheets/booklice.html\n\nhttp://insects.tamu.edu/extension/bulletins/uc/uc-010.html\n\n.
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I call them "wooly worms" I'm not sure if that's their given name or not. I guess they'd just be caterpillars or something. The brown and black, furry guys. Me and my dad used to ride our bikes and search for them.
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Note correct spelling.\n\nAscaris is a genus of parasitic nematodes. One species, A. suum, typically infects pigs, taking up residence in the lower intestine, while another, A. lumbricoides, affects human populations, typically in tropical areas with poor sanitation. This infection is known as ascariasis. It is spread by the accidental ingestion of Ascaris eggs, which are produced in the lower intestine and distributed through feces.\n\nSimple answer:roundworm\n\nFollow the link for more information.\n\nhttp://en.wikipedia.org/wiki/Ascariasis