Topic 16: Evolution of Diversity and Phylum Arthropoda

Question 1

Diversity = _____+______

Answer 1

variation in gene expression + ecological opportunity

Question 2

___ are the most species-rich phylum and most ____ important group of animals

Answer 2

arthropods

ecologically

Question 3

What are the 5 main groups of arthropods?

Answer 3

1. trilobita (extinct)
2. chelicerata (spiers, scorpions)
3. myriapods (millipedes, centipedes)
4. crustacea ( crabs, lobsters, shrimp)
5. hexapods (insects)

Question 4

List 5 arthropod characteristics

Answer 4

1. cephalization
2. open circulatory system
3. jointed appendages
4. segmented body (changes to regulation of hox genes)
5. sclerotized cuticle made of chitin (acts as exoskeleton)

Question 5

T/F

tagmatization is unique to arthropods

Answer 5

true

Question 6

tagmatization = segmented body and jointed appendages arranged into ______ units with specialized ____ (division of labor)

Answer 6

functional

functions

Question 7

Chelicerate lack _____

Answer 7

antennae