Exam #2

Question 1

Subphylum Chelicerata

Answer 1

• chelicerae for pinching and often fangs with poison glands
• simple eyes
• 4 walking legs and 1 pair of palps (= 5 pair of appendages)
• 1 pair of appendages is modified into chelicerae (pincer-like mouthparts)
• 2 segments (cephalothorax and abdomen)
• no antennae
  Class Merostomata - horseshoe crabs
  
  • larva look like a trilobite
    Class Arachnida - spiders, mites, ticks, daddy longlegs, scorpions
  • all appendages on the thorax

Question 2

Subphylum Hexapoda

Answer 2

• unbranched appendages
• 1 pair of antennae
• compound eyes
• mandibles
  Class Insecta – insects e.g. bees, beetles, flies, fleas, butterflies, moths
  
  • 3 pairs of walking legs
  • 3 body parts
  • wings

Question 3

Subphylum Myriapoda

Answer 3

• unbranched appendages
• 1 pair of antennae
• compound eyes
• mandibles
  Class Chilopoda - centipedes
  
  • 1 pair of legs per segment
  • larva have 3 pairs of legs
    Class Diplopoda - millipedes
  • 2 pairs of legs per segment
  • larva have 3 pairs of legs

Question 4

Subphylum Crustacea

Answer 4

• branched appendages
• 2 pair of antennae
• 2 body parts
• compound eyes
• mandibles
• appendages on all segments
  Includes: crayfish, lobsters, shrimp, crab, isopods (terrestrial), Daphnia