AT&T; 12:04 PM Back Objectives for Animals_p2.doc rthropoda 1. Know how to class
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Question
AT&T; 12:04 PM Back Objectives for Animals_p2.doc rthropoda 1. Know how to classify arthropods according to the 4 animal body plan features. 2. Do arthropods have a complete gut? A skeleton? How do they move? Are they segmented? 3. Do any arthropods have trochophore larvae? . What are the characters shared by all arthropods? Know them and be able to explain them 5. How do arthropods go through ecdysis? 6. Be able to discuss the benefits and drawbacks of having an exoskeleton 7. What is the ancestral arthropod condition with respect to the number of tagma, the types of tagma, and the location of paired appendages on segments? cephalothorax, head, trunk, thorax, abdomen, carapace. Hexapoda, and Myriapoda: be able to compare and contrast 8. Know the following terms: tagma, tagmatization, 9. For these 4 arthropod groups: Chelicerata, Crustacea, the groups in terms of the following a. how many tagmata do they have? What are they? b. do they have appendages on every segment? If not, where are they? c. Antennae number? Wing number? 10. How do barnacles feed? Explain. 11. Who has mandibles or chelicerates? Spiracles and trachea OR book lungs? 12. What characters of arthropods have contributed to their success in terrestrial habitats? 13. What is incomplete metamorphosis? What about complete metamorphosis? Compare and contrast these two processes. 14. Be able to discuss the benefits of complete metamorphosis in a species Previous Next Courses Calendar To Do Notifications MessagesExplanation / Answer
1.) Arthropods can be classified according to the 4 animal body plan features as follows:
i) They have jointed appendages, hence the name arthropoda.
ii) The body is covered by chitinous exoskeleton.
iii) Excretory organs are antennary or green gland (prawn) , coxal gland (scorpion) , malpighian tubules (insects).
iv) Body is divided into three region head, thorax and abdomen.
2.) Yes. Arthropods do have complete gut and they can feed upon any kind of food substance.
They possess exoskeleton.
They move by means of cuticle, appendages and wings.
Yes, they are metamerically segmented.
3.) No, arthropods do not have trochophore larva.
4.) Following are the characters shared by all arthropods:
i) They have jointed legs.
ii) They all possess exoskeleton.
iii) Body is bilateral symmetric, triploblastic with organ system level of organisation.
iv) Digestive tract is complete.
v) Circulatory system is open type i.e., blood flows in open tissue spaces instead of blood vessels.