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Invertebrates: Phylum Porifera and Phylum Cnidarians
SPONGES or
Phylum
Porifera
“Pore Bearers”
Specialized
Cells
Major Body
Functions
Simplest of ALL Animals
A. ____________________ – asymmetrical, pores all over body with large hole on top
called an ____________________ where water is pumped through, Have no mouth or
gut, Have no tissues or organs, Simple functions are carried out by a few specialized
cells
B. ____________________: skeleton of spicules (glass-like material) or spongin (soft)
C. Feeding – filter feeders, trap microorganisms in water flow.
1. ____________________ - specialized cells that use flagella to move a steady current
of water thru the sponge. Each collar cell digests its own food.
2. ____________________ - specialized cells that make spicules
3. ____________________– Cells thru which water flows into the body of a sponge
D. Respiration/ Circulation/ Excretion – ____________________ flow carries out all
body functions (osmosis and diffusion)
• As water moves through the cavity:
1. ____________________ dissolved in the water diffuses into the
surrounding cells
2. ____________________and other wastes, diffuse into the water and are
carried away
E. Response/Movement- no ____________________ system, do produce toxins, adults
don’t move (sessile), larva swim
F. ____________________- sexually with internal fertilization between two different
sponges or asexually by budding or fragmentation
The Anatomy
of a Sponge
osculum
Water flow
Central cavity
pores
Collar Cell
Spicule
Pore Cell
Cell
Epidermal Cell
Archeaocyte
The Ecology of 1. Ideal ____________________ for marine animals such as snails, sea stars, sea
Sponges
cucumbers, and shrimp
Reviewing
Sponges
2. ____________________ beneficial relationships with bacteria, algae and plant-like
protists
Why are sponges considered to be animals?
Why are they considered the simplest animals?
What do sponges feed on?
What do sponges use as protection?
Jellies or
Phylum
Cnidaria
“Stinging
Cells”
Examples
More Complex than Sponges
A. ____________________ animals with stinging tentacles
around their mouths
B. Simplest animals to exhibit symmetry – cnidarians have
____________________ symmetry
C. Simplest animals to have true ____________________
including nerves
Examples: hydras, jellyfishes, sea anemones, and corals
A. ____________________ : Most of life as polyp ex. Hydra
B. ____________________: Most of life as medusa ex. Jellies
C. Anthozoans: Only polyp stage in the life cycle ex. Corals and Sea Anemones
Body Tissues
Simplest animal with true tissues.
-soft bodied, tentacles, radial symmetry,
1. ____________________ – gastrovascular cavity with one opening
2. ____________________- detects stimuli
3. Hydrostatic ______________- movement and support with the use of muscles
Two Body
Plans
1. ____________________ - Stationary, Examples: Hydra, Coral, and Sea Anemone
2. ____________________- Swimming, Cup Shaped. Examples: Jellies and Man O
War.
Polyp
Body
Functions
Medusa
1. ____________________- kill small prey with stinging cells in tentacles, digest in gut,
food in and waste out of one opening
2. Respiration/Circulation/Excretion- all by ________________ (no true organs)
3. Response- have specialized ____________________ cells and nerve net to gather info
and react to ____________________
a. ____________________: groups of sensory cells that help determine the
direction of gravity
b. ____________________: eyespots made of cells that detect light
4. Movement- propel themselves with water using hydrostatic _______________
5. Reproduction- asexually by ____________________, sexually by external
____________________, sperm and egg are released and meet in water
Ecology of
Cnidarians
A. Source of new ____________________sunscreen 855
B. Provide ____________________ for marine organisms
C. Source of ____________________ for other organisms (like sea turtles)
D. ____________________ relationships with other organisms
Reviewing
Cnidarians
Why are cnidarians considered more complex than the Porifera Phylum?
List 3 importance of the Phylum Cnidarians?