1. 2/8/2013 Finish Flatworm lab and follow up. Turn in LAB Notebook!
Get paper out to take notes on Rotifers.
TEST IS WED!!! ORGANIZE NOTEBOOK!!!

2. “Wheel bearers”- Rotary animals
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 Qo

4. Body Plan- 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
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