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

Sponge Feeding Video (Start 1:00)

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

* (Watch video) Cloudy “stuff” is sperm

Sponge pictures

Sponge Harvesting (Watch video)

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

*Watch video

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: Sea Anemone Watch video of a sea anemone fight

Example: Jellyfish Watch video

Example: HydraWatch video

Example: Coral

Stunning Video of Coral and Sponges

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: Planarian 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.