Oct 6 - Animals Lecture #9

Different types picture 2 top is for crushing and

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Different types (picture – 2 top is for crushing and grinding 2 bottom – capture piercing) o Protrude to catch prey o Holding and manipulating prey o Piercing and grinding prey o Attachment (parasitic species) Free living/sessile/interstitial/epizoic – live on the surface of another animal (not necessarily parasitic or detementral)/parasitic Freshwater (95%)/Marine/Estuarine (not sea but not fresh water)/ Semi-terrestrial Reproduction
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Parthenogenesis – reproduction (egg development) without fertilization by male gamete o Females produce diploid eggs by mitosis> o Each egg develops into a diploid female > o Amictic – no mixing o Class Bdelloidea (~350 speicies) Male specimen has never been found Cryptobiotic Can survive for 20 years o Class Monogononta (i.e. most rotifer species) same as above under parthenogenesis Mictic eggs produce when environmental conditions are unfavourable Mictic eggs means haploids? Females produce mitic eggs by meiosis which develop into haploid males o Males have no mouth, can’t feed (only live within a few days) Males fertilize mictic eggs making diploid New diploid eggs are resting eggs and enter a state of diapause o Resistance to environmental conditions (drought freezing) o Resting eggs hatch when conditions become favorable Can even hatch up to 40 years later
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  • Fall '08
  • General characteristics, Nematode, Rotifer, parasitic nematodes, mictic eggs, Parasitic intestinal nematodes

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