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PHYLUM: ROTIFERA

PHYLUM: ROTIFERA. “Wheel bearers”- Rotary animals. Rotifera - “wheel bearers”. Small- most 0.1mm-0.5mm Aquatic benthic (living at bottom) mostly free-living in fresh water, but some marine. The anterior part is modified to a ciliary organ, the corona or wheel organ .

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PHYLUM: ROTIFERA

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  1. PHYLUM: ROTIFERA “Wheel bearers”- Rotary animals

  2. Rotifera- “wheel bearers” • Small- most 0.1mm-0.5mm • Aquatic • benthic (living at bottom) • mostly free-living in fresh water, but some marine. • The anterior part is modified to a ciliary organ, the corona or wheel organ. • Body cavity a pseudocoelom. • Cuticle- body covering • Bilateral symmetry

  3. Body Plan- Pseudocoelom • 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

  4. Cuticle • Cuticle- outer covering, over epidermis • for protection against water loss or gain • resistant to environmental chemicals

  5. Body Systems • Systems they Do NOT have: • circulatory system • respiratory system • true skeletal system • Do have: • Excretion: protonephridia • Digestive: complete- mouth anus • Muscular: longitudinal only- whiplike movements • Nervous:ladder like with anterior ganglia • Skeletal: hydrostatic skeleton: for movement • Reproduction:most separate sexes, some parthenogenesis- “virgin birth”- females produce embryos that grow and develop without fertilization by males

  6. Figure 15.18

  7. Rotifers • Video-rotifer feeding

  8. Phylum Rotifera(rotifers) • have a corona with cilia (like Norelco shaver head) • no cilia elsewhere • Have biforked“foot” with cement glands for attachment • complex digestive structures

  9. United streaming Video Clip • http://player.discoveryeducation.com/index.cfm?guidAssetId=5CE0972F-C971-4EFC-8A7E-779D8A513032&blnFromSearch=1&productcode=US

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