1. DAPHNIA VS HYDRA

2. ANSWERS TO POST ON THE DRY ERASE BOARDS
How many tentacles does your Hydra have? ______
2. Does your Hydra have a bud on it? YES or NO
3. Did the Hydra eat the Daphnia? YES or NO
4. Does your Daphnia have eggs in its brood chamber? YES or NO

3. 1. How many tentacles does your Hydra have? ______

4. 2. Does your Hydra have a bud on it? Is it about to reproduce?
YES or NO

5. 3. Did the Hydra eat the Daphnia? YES or NO

6. 4. Does your Daphnia have eggs in its brood chamber? YES or NO

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8. Example Species: magna
DAPHNIA
Classification Information
Kingdom: Animal
Phylum: Arthropod
Genus: Daphnia
Example Species: magna

9. DAPHNIA Reproduction Spring - Summer asexual Good conditions
-most are female
-produce eggs without mating
eggs are held in the brood chamber
Eggs hatch = baby daphnia
continues as long as conditions are favorable
Fall – Winter sexual
Poor conditions
- about equal numbers of males and females
- the offspring mate
- the female Daphnia produce hard-shelled eggs
- eggs hatch when conditions are good again

10. DAPHNIA
Moves: uses antennae
Eats: algae (protist)
bacteria
yeast (fungus)
Other: bilateral symmetry

11. Video 1 Video 2

13. Example species: viridis
HYDRA
Classification Information
Kingdom: Animal
Phylum: Cnidarian
Genus: Hydra
Example species: viridis

14. Reproductio HYDRA asexual Good conditions
-grow buds that break off and grow into a new hydra
sexual
Poor conditions
- hermaphrodites: release sperm & egg in water
- new hydra hatches out of egg

15. HYDRA Moves: - attaches to rocks & plants
- squirms along when needs to
Eats: daphnia (animal) cyclops (animal) algae (protist)
Other:
- hermaphrodite - radial symmetry - able to regenerate - about 1mm-20mm - Polyp shape: cuplike form of a cnidarian tentacles: long, thin armlike structures

16. How does the hydra kill the daphnia?
Hydra have nematocysts = stinging cells
- shoot a barbed arm out to sting & entangle prey
tentacles push the prey in the mouth
The sting of a hydra is too mild and it not dangerous for humans.

19. PLANARIA
Classification Information
Kingdom: Animal
Phylum:Platyhelminthes (flatworms)
Genus: Dugesia
Example Species: tigrina

20. PLANARIA REPRODUCTION asexual
Hermaphrodites
asexual
-detaches tail & each part regrows into 2
- not done often
sexual
-reproduce with their own sperm/egg or with a mate
-mating is better = adds diversity to the gene pool

21. Movement: Nutrition: Other: PLANARIA
cilia underneath & leaves a mucus path
Nutrition:
carnivores
dead or slow moving organisms
Other:
avoids light eye spots to sense light
feeds with pharynx able to regenerate
bilateral symmetry grow to be 3mm-5mm

23. PLANARIA Planaria eat meat.
The planaria smell in water the way we sense smells in air. They smell the meat and grab on.
These carnivorous worms have two "eyes" that can sense light, but their eyes can't form clear images like human eyes.
Planaria play the role of pond trash-collectors, scavenging and eating dead animals.
There would be an awful pile-up in ponds if
planaria weren't around to clean up!

24. PLANARIA