Animal Diversity And Anatomy

The animal kingdom is divided into?

Phyla.

Who have internal skeleton?

Humans

Who was external exoskeleton?

Insects

Hydrostatic skeleton

use fluid pressure to maintain and change shape.

Appendages

2 arms, 2 legs.

Who has appendages?

Humans and some animals.

Type of digestive system

Gastrovascular, alimentary canal.

Gastrovascular

One opening

Alimentary Canal

Two openings.

Phylum Porifera

Sponges.

Characteristics of Phylum Porifera

1. Aquatic.

2. Multicellular

3. filter feeders

4. Have choancytes

What is a Chanocyte?

specialized cells that have flagella & create H2o currents.

Where does digestion take place in sponges?

Intracellular digestion.

How do sponges reproduce?

Both sexually and asexually.

Economic importance of sponges

1. medicine

2. natural bath sponges

3. water filtration

4. scientific & medical research

Phylum Cnidaria

Jelly fish, corals, hydras, sea anemones.

Characteristics of Cnidaria?

1. aquatic mostly marine

2. radial symmetry

3. have Cnidocytes that can sting

4. have organs to help them balance & sense light

5. pulp and Medusa stage

6. reproduces sexually and asexually.

What is a Cnidocyte?

stinging cells used for defense & capturing.

What is a nematocyst?

Inject toxins into prey or predators.

Type of digestive system of cnidarians?

Gastro vascular cavity (incomplete gut).

Two stages in the life cycle of cnidarians?

Polyp & medusa.

The phylum Cnidaria divided into?

1. Hydroza

2. Scychozoa

3. Cubozoa

4. Anthozoa

Interesting facts about Cnidarians

1. shoot harpoons

2. Don’t have a brain or heads

3. cans still sting when dead

4. kill more people than sharks.