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Introduction to Rotifers: Small Aquatic Wheel-Bearing Organisms

Learn about the characteristics, body plan, and systems of rotifers, small wheel-bearing organisms found in freshwater and marine habitats. Explore their unique feeding methods and reproductive strategies. This video provides an overview of rotifers and their importance in aquatic ecosystems.

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Introduction to Rotifers: Small Aquatic Wheel-Bearing Organisms

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  1. 9/13`/2011 • Finish Flatworm lab and follow up. Turn in LAB to front bin!!!! • Get paper out to take notes on Rotifers. • TEST IS Thursday!!! ORGANIZE NOTEBOOK!!!

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

  3. 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

  4. 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

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

  6. 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

  7. Figure 15.18

  8. Rotifers • Video-rotifer feeding

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

  10. United streaming • Life in a drop of water –entire video 25:00 • Important clips- • Intro 0:54 • Similarities between animal cells and one-celled organisms 2:32 • Organisms found in pondwater:Multicellular 02:50

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