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PSEUDOCOELOMATE PHYLA

PSEUDOCOELOMATE PHYLA. CHARACTERISTICS. Pseudocoelom space between gut and mesoderm parts of body wall space filled with fluid for differentiation of systems storage of waste products used as hydrostatic skeleton. CHARACTERISTICS. Cuticle acellular outer covering, over epidermis

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PSEUDOCOELOMATE PHYLA

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  1. PSEUDOCOELOMATE PHYLA

  2. CHARACTERISTICS • Pseudocoelom • space between gut and mesoderm parts of body wall • space filled with fluid • for differentiation of systems • storage of waste products • used as hydrostatic skeleton

  3. CHARACTERISTICS • Cuticle • acellular outer covering, over epidermis • for protection against water loss or gain • resistant to environmental chemicals

  4. CHARACTERISTICS • Systems • Don’t have: • circulatory system • respiratory system • true skeletal system • Do have: • Reproduction: usually dioecious • excretion: protonephridia • digestive: complete • muscles: longitudinal only • nerve: ladder like with cerebral ganglia • hydrostatic skeleton: for movement

  5. Major Nematoda Rotifera Gastrotricha Nematomorpha Acanthocephala Minor (see text) Kinorhyncha Loricifera Priapulida Entoprocta PSEUDOCOELOMATE PHYLA

  6. Nematoda(roundworms) • numerous, slender, cylindrical • Unsegmented • found in all types of habitats, terrestrial, marine, freshwater • dioecious

  7. Nematodes - Characteristics • Sense organs – Bristles for Chemoreception • Amphids – unique • Digestive system – Complete • Excretion • Free living Marine species – Renette gland • Freshwater and Terrestrial - Tubular

  8. Ascaris lumbricoides(intestinal roundworm) • - 64% of SE is infected • may produce 200,000 eggs/day • life cycle • ingested by humans as eggs • intestinal larvae get into blood • carried to lungs • get coughed up and swallowed • adult develops in small intestine • eggs released through feces

  9. Ascaris

  10. Necaturamericanus(hookworm) • 1910 40% of SE infected • 1963 4% infected • life cycle • penetrates skin on bottom of feet • gets into blood and goes to lungs • coughed up and swallowed • attached to intestine • produce anticoagulant and feed on blood

  11. Trichinella spiralis(trichinosis) • very bad to contract • get it from eating undercooked pork • humans not in natural cycle • in humans encysts in muscles, causes aching • life cycle • one host • larvae feed in intestine • adults live in intestine

  12. Enterobius vermicularis(pin worm) • in 46% of population • most common parasite in humans in world • life cycle • adults in folds of anus • female emerges at night to lay eggs • eggs get under nails, are also airborne • larvae develop in digestive tract • not very serious, more of a nuisance

  13. Filariasis

  14. Dog Heartworm

  15. Phylum Rotifera(rotifers) • have a corona with cilia, like norelco shaver head • no cilia elsewhere • with forked “foot” with cement glands for attachment • complex digestive structures such as mastax

  16. Rotifer Reproductiondioecious • Parthenogenesis

  17. Phylum Gastrotricha(Gastrotrichs) • ventrally flattened with bands of cilia • also have adhesive glands on foot • with spiny, scaly or warty cuticle • no corona or mastax, etc. • hermaphroditic, male system in some reduced • reproduction similar to that of rotifers

  18. Phylum Nematomorpha(horse hair worms) • larvae parasitic in insects like grasshoppers • adults aquatic, but do not feed • life cycle • eggs ingested by grasshopper • larva develops in gut • emerges when host near water • develops into adult • dioecious

  19. Phylum Acanthacephala(spiny headed worms) • have characteristic spiny proboscis • have no digestive tract • life cycle • larvae found in arthropod, such as insect • all adults endoparasites in guts of vertebrates • Dioecious • Acanthor Larva

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