Post on 22-Dec-2015
Wake-up
1. What are the three types of skeletons?
2. Explain the difference between one way and two way digestion.
Porifera through AnnelidaThese notes are some of my favorite! I have
included a TON of videos for you to watch. Some are cool and some are really gross. You will
need headphones. Enjoy!
Invertebrates
Do not have a
backbone/vertebrate
Phylum Porifera - Sponges
Characteristics: Simplest group of animals
Characteristics: They are sessile, which means that they do not move around; attached
Skeletal system: Spicules; small glass like fragments that provide support
Characteristics (Watch video) Lack tissue; have individual cells that each perform a specific function
Feeding: (Watch video: Select Feeding) Absorb food through membrane or trap within mucus and then absorb
Respiratory system: Diffusion; Sponges absorb oxygen and food from their
surroundings
Circulatory system: Diffusion; Sponges move oxygen and food from their
surroundings through their “body”
Reproductive: Budding (Asexual); a new sponge grows from the original
Reproductive: Fragmentation (Asexual); A piece breaks off of a sponge and then grows
into a new organism
Reproductive: Hermaphrodite with Internal Fertilization; Both sexes present; Release
sperm to fuse with egg
Sponge pictures
Phylum Cnidaria
Characteristics: All have tentacles
Two Basic Body Shapes
1. Medusa: Tentacles pointing downward
Two Basic Body Shapes
2. Polyp: Tentacles pointing upward; often sessile.
Nematocysts:(Watch video) Structures on tentacles that are used to get prey; like a
Harpoon gun
Skeletal system: Hydrostatic (Water “skeleton”)
Digestive system: Two Way
Food moves into the mouth into
the gastrovascular
cavity to be digested and then
back out the mouth
Respiratory system: Diffusion
Oxygen is absorbed from surrounding environment
Nervous system: Nerve Net
Network of nerves throughout body; respond to stimuli
Reproductive system: Budding
Offspring develop from parent; identical copy
Reproductive system: External Fertilization
Example: Jellyfish Watch video
Example: Coral
Flatworms
Skeletal system: Hydrostatic
Digestive system: Two way
Video of Flatworm eating
Respiratory system:
Diffusion
Nervous system: Nerve Cell• Ganglia (control center) with 2 nerve cords
• Eyespots
Reproductive system: Hermaphrodite; both sexes present for internal
fertilization
Reproductive system: Regeneration (Fragmentation)Watch Video
Example: Marine FlatwormsWatch Video
Example: Tapeworm
* Watch video: Warning, it is pretty gross
Nematoda - Roundworms
Skeletal system: Hydrostatic
Digestive system: One way
Respiratory system: Diffusion
Nervous system: Nerve Cell• Ganglia (control center) with 2 nerve cords
• Eyespots
Reproductive system: Internal fertilization
* Another gross video
Example: Hookworms
Worms are gross VIDEO
With the time left over in class you can have time for Tutorials.
Please make sure that you are using your time wisely.