Ana səhifə

Invertebrate Zoology, Questions 7 Lecture 18: Arthropoda 2 (Crustacea); plus just a bit of Hexapoda in comparative questions; more Hexapoda coming soon…


Yüklə 72.5 Kb.
tarix26.06.2016
ölçüsü72.5 Kb.

Invertebrate Zoology, Questions 7

Lecture 18: Arthropoda 2 (Crustacea); plus just a bit of Hexapoda in comparative questions; more Hexapoda coming soon…


Study questions


  1. Subphylum characteristics

    1. List the key characteristics of Subphylum Crustacea, beyond those that simply characterize Phylum Arthropoda.

    2. List the key characteristics of Subphylum Hexapoda, beyond those that simply characterize Phylum Arthropoda

    3. Summarize the similarities and differences between these two Subphyla!




  1. What is “tagmatization?” What are the typical tagma of Subphylum Hexapoda members? What are the typical tagma of Class Malacostraca members?




  1. Describe a generalized Malacostracan, noting the number of segments and appendages (including antennae & mouthparts) for each tagma (a.k.a. “body region”.) From which structures are the Malacostracan “tail” formed. (NOTE: The abdomen is not the “tail.” Rather, the “tail” is at the end of the abdomen.)




  1. Which crustacean discussed in class most resembles the generalized Malacostracan?




  1. Briefly define the following and indicate whether it is a true mouthpart (i.e. truly associated with the head), thoracic, or abdominal appendage.

    1. Mandible

    2. Maxilla

    3. Maxilloped

    4. Pereopod

    5. Pleopod

    6. Uropod




  1. Learn the following Orders, Infraorders and Subclasses. You will not be asked to spell them out on an exam (I’m so nice…), but you will need to know key features well enough so that given the name of one of the Orders or Infraorders, you should be able to name a representative member (common name) or list any features that “stand out” about the particular group. Conversely, you should be able to match the order name to a description (not necessarily complete, but enough to differentiate from others), and/or images and/or common names of order members. To know:

Orders within Class Malacostraca (you also need to know Class Malacostraca, see previous questions.)

    1. Order Euphausiacea

    2. Order Decapoda

      • Infraorder Caridea

      • Infraorder Palinura

      • Infraorder Anomura

      • Infraorder Brachyura

    3. Order Amphipoda

    4. Order Isopoda

Orders within Class Maxillopoda (you also need to know Class Maxillopoda)

    1. Infraorder Cirripedia

    2. Subclass Copepoda

And now, some questions related to the above-listed groups…

  1. Krill!

    1. To which Phylum, Subphylum, Class and Order do krill belong?

    2. How does a krill feed? Be sure to name the specific appendages involved.

    3. Compare the biomass of the Antarctic krill (Euphausia superba) to that of humans. What does this tell us about its ecological role in the Antarctic marine ecosystem?

    4. In addition to its abundance, what other feature of krill makes it an ideal food resource?




  1. How many pairs of thoracic appendages to members of Order Decapoda have? How are the first three pairs of thoracic appendages modified in the Order Decapoda?




  1. Where are the gills in members of Order Decapoda located? (NOTE: Some other Malacostracans, including the Order Euphausiacea share this feature.)




  1. Which Infraorder within Order Decapoda is thought to best represent the early Decapoda?




  1. Which non-Decapod order (within Class Malacostraca) is thought to be ancestral to the Order Decapoda?




  1. Where in the world is the only sustainable shrimp fishery?




  1. Which Infraorder within Order Decapoda is known for:

    1. Reduction of at least the last pair of thoracic appendages (T8) but sometimes the last two pair (T7 & T8)

    2. Highly reduced abdomen tucked beneath the body, often without abdominal appendages

    3. Well-developed/robust abdomen with pleopods used for movement (2 groups)

    4. Well-developed chelipeds on the 4th thoracic segment.




  1. List two roles of the abdomen of porcelain crabs.




  1. The mole crab (in Infraorder Anomura) has pereopods modified for what activity? (HINT: He was featured in “bring your crab to work” day.)




  1. Why doesn’t the mole crab suffocate when buried beneath the sand?




  1. How do hermit crabs acquire snail shells? Do they actually prey on the snails?




  1. Name the three major groups of crabs (common names for groups) within the Infraorder Brachyura that are found in the intertidal. Indicate which of these groups is found the highest in the intertidal and which are found lowest. Also, which are primarily carnivorous?




  1. Crab life history

    1. Sketch/describe the life history of a Dungeness crab, being sure to name all stages in order. (NOTE: You don’t actually have to draw the animals, but you should be able to recognize the stages, such as the zoea or the megalops.)




  1. Compare amphipods and isopods, noting key similarities and differences in body structure and differentiation of appendages.




  1. Are a barnacle’s carapace and its calcareous plates the same thing? If not, briefly explain the difference.




  1. Describe how a barnacle feeds, being sure to note which appendages are used in feeding. Via what mechanism does the barnacle open the valves and extend its feeding appendages?




  1. How does a barnacle find its mate?




  1. Describe the abdomen of a barnacle ;-)




  1. Be able to recognize members of Subclass Copepoda. Also, to which Class do the Copepods belong?




  1. What is the function of the long first pair of antennae in the herbivorous, filter-feeding copepods (such as the one depicted.) What is the function of the second pair of antennae?




  1. What is the ecological role of the copepods? Are they relatively rare or relatively common?

Page of


Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©atelim.com 2016
rəhbərliyinə müraciət