Flatworms

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  1. tegument
    a natural protective body covering and site of the sense of touch
    They have no special sense organs but do have sensory endings in the tegument that are modified cilia.
  2. cilium
    a hairlike projection from the surface of a cell
    Very small planaria swim by means of their cilia.
  3. tapeworm
    ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates
    Class Cestoda Cestoda, or tapeworms, differ in many respects from the preceding classes.
  4. flatworm
    parasitic or free-living worms having a flattened body
    Tapeworms entirely lack a digestive system but do have well-developed muscles, and their excretory system and nervous system are somewhat similar to those of other flatworms.
  5. planaria
    free-swimming mostly freshwater flatworms
    Members of order Tricladida, which are ectolecithal and include freshwater planaria, have a three-branched intestine.
  6. Trematoda
    parasitic flatworms (including flukes)
    As in Monogenea and Trematoda, no exteral, motile cilia occur in adults, and the tegument is of a distal cytoplasm with sunken cell bodies beneath the superficial muscle layer.
  7. echinococcus
    tapeworms whose larvae are parasitic in humans and domestic animals
    “Taenia saginata” “Echinococcus granulosus” “Taenia Solium” Diphyllobothrium “Echinococcus multilocularis” “Dipylidium caninum” “Hymenolepis nana”
  8. Chordata
    comprises true vertebrates and animals having a notochord
    Segmentation of tapeworms is best considered a replication of sex organs to increase reproductive capacity and is not homologous to the metamerism found in Annelida, Arthropoda, and Chordata.
  9. taenia
    a narrow headband or strip of ribbon worn as a headband
    “Taenia saginata” “Echinococcus granulosus” “Taenia Solium” Diphyllobothrium “Echinococcus multilocularis” “Dipylidium caninum” “Hymenolepis nana”
  10. trematode
    parasitic flatworms having external suckers for attaching to a host
    In contrast, to monogeneans and trematodes, the entire surface of cestodes is covered with minute projections similar microvilli of the vertebrate small intestine.
  11. intermediate host
    a host that is used by a parasite in the course of its life cycle
    Often their intermediate host is an invertebrate.
  12. Annelida
    segmented worms: earthworms; lugworms; leeches
    Segmentation of tapeworms is best considered a replication of sex organs to increase reproductive capacity and is not homologous to the metamerism found in Annelida, Arthropoda, and Chordata.
  13. Turbellaria
    free-living flatworms
    Class Turbellaria Turbellarians are mostly free-living worms that range in length from 5mm or less to 50cm.
  14. gonad
    a gland in which gametes (sex cells) are produced
    As younger proglottids are differentiated in front of it, each individual progottid moves outward in the strobila and its gonads mature.
  15. pharynx
    the passage to the stomach and lungs
    Their mouth is on the ventral side and leads into a gut cavity, often via a pharynx.
  16. cytoplasm
    the substance inside a cell, not including the nucleus
    As in Monogenea and Trematoda, no exteral, motile cilia occur in adults, and the tegument is of a distal cytoplasm with sunken cell bodies beneath the superficial muscle layer.
  17. Arthropoda
    jointed-foot invertebrates: arachnids
    Segmentation of tapeworms is best considered a replication of sex organs to increase reproductive capacity and is not homologous to the metamerism found in Annelida, Arthropoda, and Chordata.
  18. ciliary
    of or relating to cilia projecting from the surface of a cell
    Turbellarians typically are creeping forms that combine muscular with ciliary movements to achieve locomotion.
  19. segmentation
    the act of dividing or partitioning
    Some zoologists have maintained that the proglottid formation of cestodes represents true segmentation metamerism but we do not support this view.
  20. distal
    situated farthest from point of attachment or origin, as of a limb or bone
    As in Monogenea and Trematoda, no exteral, motile cilia occur in adults, and the tegument is of a distal cytoplasm with sunken cell bodies beneath the superficial muscle layer.
  21. homologous
    similar in position, structure, function, or characteristics
    Segmentation of tapeworms is best considered a replication of sex organs to increase reproductive capacity and is not homologous to the metamerism found in Annelida, Arthropoda, and Chordata.
  22. terrestrial
    of or relating to or characteristic of the planet Earth
    They can be found under objects in marine, freshwater, and terrestrial habitats.
  23. posterior
    located at or near the end of a structure
    There is no head, The scolex used for attachment is a remnant of the posterior part of the ancestral body.
  24. ventral
    toward or on or near the belly
    Their mouth is on the ventral side and leads into a gut cavity, often via a pharynx.
  25. pore
    any tiny hole admitting passage of a liquid
    The shelled embryos form in the uterus of the proglottid, and they are expelled through a uterine pore or the entire proglottid and they are expelled through the uterine pore of the entire proglottid is shed from the worm as it breaks free at zones of muscle weakness between each proglottid.
  26. gland
    a small organ that synthesizes and secretes chemicals
    Others move by gliding, head raised, over a slime track secreted by the marginal adhesive glands.
Created on Wed Feb 06 10:30:59 EST 2013

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