Protostomes pt.3

Question 1

How do Arthropoda affect human life?

Answer 1

1. Pollinate crops, compete for food, are food.
2. Vector disease
3. Medically important species

Question 2

Arthropoda key traits?

Answer 2

1. Exoskeleton made of chitin and protein
2. Segmentation
3. Paired, jointed appendages
4. Reduced Coelom
5. Hemocoel- open circulatory system

Question 3

In some, segment groups are specialized into?

Answer 3

Tagmata (Tagmatization)

Question 4

They must undergo what process?

Answer 4

Ecdysis

Question 4

Chelicerata characteristics?

Answer 4

1. First appendage called chelicerae (chelate-pincer-like)
2. Body divided into 2 tagmata
3. Prosoma-bears all appendages
4. Mouth parts: chelicerae and pedipalps
5. Opisthosoma- contains reproductive organs
6. Mostly carnivorous but cannot digest solid food.

Question 4

Crustacea characteristics?

Answer 4

1. Two or three tagmata (head and thorax may be fused)
2. mostly marine some freshwater, few terrestrial

Question 5

Arthropoda are made up of what 4 extant groups?

Answer 5

1. Chelicerata
2. Crustacea
3. Hexapoda
4. Myriapoda

Question 5

Myriapoda-millipedes characterisitcs?

Answer 5

1. two pairs of appendages per segment
2. defensive glands produce a variety of chemicals
3. poison fangs

Question 5

Tardigrade characteristics?

Answer 5

1. “water bears” or “moss piglets”
2. Segmented
3. 8-legs
4. can live anywhere!

Question 5

Hexapoda characteristics?

Answer 5

1. By far the largest group of animals
2. one billion billions insects alive at any given time
3. Three body regions- head, thorax, abdomen
4. Many insects undergo metamorphosis
5. Simple metamorphosis (immature stages look similar to adults)
6. Complete metamorphosis (insect completely changes form and habit upon maturing) -immature larva are worm-like, enters resting stage in pupa or chrysalis.