1. 9/13`/2011 1. Finish Flatworm lab and follow up. Turn in LAB to front bin!!!! 2. Get paper out to take notes on Rotifers. 3. 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