1. Arthropoda Practice
Chapter 24

2. Class Arachnida Ticks, mites, scorpions, and spiders No antennae
Two body regions: cephalothorax and abdomen
Feeding appendages are chelicerae Most are carnivorous
They hold the prey with chelicerae, and pour enzyme-rich salivary juices over the victim
Digestion is mostly external
Most are terrestrial
Black widow females tend to eat males after mating because males can only mate once and then die. It ensures the success of the offspring.

3. Class Crustacea Lobsters, crayfish, shrimp, and others
Primarily aquatic
Free-floating larval stage
Branched appendages:
                                  

4. Class Chilopoda Centi means hundred, pede means legs
1 pair of legs per segment
Usually shiny, reddish brown, less than 3 inches long
Move rapidly, often found under logs; some in homes
Can bite
have poison claws- modified 1st pair of legs
supposedly feels like a bee sting
South American centipedes can be up to 1 ft in length with a painful and agonizing bite!

5. Class Diplopoda Millipedes milli means thousand, pede means legs
Most feed on decaying matter
Diplo means two, poda means feet, so two pair of legs per segment
Generally harmless detritus feeders
Some species can eject cyanide (poison), so be careful if traveling to South America

6. Merostomata Horseshoe Crabs Blue blood due to copper
Used to detect bacteria
Used to kill bacteria resistant to antibiotics
Study the eyes for insight into human eyes

7. Class Insecta
The insects are the most numerous and diverse of all the groups of arthropods.
Three body regions: head, thorax, abdomen
Three pairs of legs
One pair of antenna
Many have wings