Question

Phylum Annelida

• Watch video of earthworm dissection
• What is the most important characteristic of annelids? ______________________

• Observe specimens:

1. Examples of class Oligochaeta

2. Examples of class Polychaeta

3. Examples of class Hirudinea

Phylum Arthropoda

What is the most important characteristic of arthropods? _______________________

1. Watch video of crayfish dissection

2. Observe crayfish. (Figure 13 on p.134 of lab manual)

1. What are the body regions in a crayfish?   ______________________________

2. How many pairs of walking legs?                  ____________________________

3. Does a crayfish have mandibles?           ________________________________

4. Double branched appendages are described as __________________________

5. Crayfish is a member in subphylum _______________, class_______________

3. Observe centipedes.

1. How many pairs of legs are there in each segment? ______________________
2. A centipede is a member in subphylum ______________, class _____________

4. Observe millipedes.

1. How many pairs of legs are there in each segment? ______________________

2. A millipede is a member in subphylum ______________, class _____________

5. Observe spiders.

1. How many body regions are there in a spider?       _______________________

2. What are the body regions?   ________________________________________

3. How many pairs of legs are there? ____________________________________

4. What are the major functions of chelicerae? ____________________________

5. Spiders are members in subphylum _______________, class _______________

6. Observe insects. (Figure 16 on p.136 of lab manual)

1. How many body regions are there in a grasshopper?     ____________________

2. What are the body regions?   ________________________________________

3. How many pairs of legs are there? ____________________________________

4. Does an insect have mandibles?             ________________________________

5. What appendage do insects have that you have not observed in any other

invertebrates?                  _________________________________________

6. Grasshopper is a member in subphylum _______________, class ___________

7. Insects go through a process of transformation from an immature form to an

adult form. This process is called _________________________________

Answer 1

What is the most important characteristic of annelids?- Annelids are bilaterally symmetrical and have a long and segmented body, they are coelomate and exhibit organ system grade of organization

1. Examples of class Oligochaeta- earthworms(pheretima),tubifex,dero
2. Examples of class Polychaeta- Nereis, Aphrodite, Polynae
3. Examples of class Hirudinea-Acantobdella, Glossiphonia, pontobdella

What is the most important characteristic of arthropods? -They possess an exoskeleton, have jointed appendages, and open circulatory system.

1. What are the body regions in a crayfish- crayfish is divided into three parts, the head, the cephalothorax, and the abdomen.
2. How many pairs of walking legs-four pairs of walking legs
3. Does a crayfish have mandible- yes, they help in crushing food
4. Double branched appendages are described as-  biramous appendages
5. Crayfish is a member in subphylum -Crustacea,class-Malacostraca

centipedes

1. How many pairs of legs are there in each segment- one pair of legs per segment
2. A centipede is a member in subphylum - Myriapoda,class-‎Chilopoda

millipedes

1. How many pairs of legs are there in each segment-two pairs of jointed legs
2. A millipede is a member in subphylum- Myriapoda,class- ‎Diplopoda

spiders

1. 2 body parts
2. prosoma and opisthosoma
3. four pairs of legs
4. they are used to hold prey while the spider injects venom
5. Spiders are members in subphylum -Chelicerata ,class-Arachnida

insects

1. three
2. head, the thorax and the abdomen
3. three pairs of jointed legs
4. yes. they are near the insect's mouth
5. Grasshopper is a member in subphylum- Unirama ,class-Insecta
6. Insects go through a process of transformation from an immature form to a adult form. This process is called- Metamorphosis