1. OTHER ARTHROPODS

2. MOLTING- Periodic shedding of exoskeleton to allow growth
MOLTING- Periodic shedding of
exoskeleton to allow growth

3. Growth puts pressure on old shell
Growth puts pressure on old shell
Stimulating molting hormones to digest old exoskeleton
and make new one underneath
Shell cracks open and animal backs out
Animal pumps up with water and expands
New shell hardens in few days
While waiting for new exoskeleton to harden = particularly vulnerable to predators “soft shelled crabs”

4. ENDOCRINE SYSTEM makes hormones that control: MOLTING
SEXUAL DEVELOPMENT
METABOLISM

6. ARACHNIDS SPIDERS 8 legs No antennae
Body constricted between cephalothorax and abdomen
Excretory- Malpighian tubules
Respiratory-Book lungs &/or trachea/spiracles
Simple eyes with single lens
Chelicera=fangs
Spinnerets-release silk for webs

7. constricted between abdomen + cephalothorax
BODY-
constricted between abdomen + cephalothorax

8. CHELICERA – modified fangs
CHELICERA – modified fangs

9. PEDIPALPS – aid in holding food and chewing
PEDIPALPS – aid in holding food and chewing

10. RESPIRATORY- Book lungs + spiracles
RESPIRATORY- Book lungs + spiracles

11. SPINNERETS- release silk for webs
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12. collect and remove nitrogen waste via intestine
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EXCRETORY:
MALPIGHIAN TUBULES
collect and remove nitrogen waste via intestine

13. UNIRAMIA INSECTS: 6 legs Antennae 3 part body- Head, thorax, abdomen
Excretory- Malpighian tubules
Respiratory-Trachea/spiracles

14. RESPIRATORY- trachea & spiracles
RESPIRATORY- trachea & spiracles

15. collect and remove nitrogen waste via intestine
Image from:
EXCRETORY:
MALPIGHIAN TUBULES
collect and remove nitrogen waste via intestine

16. UNIRAMIA CENTIPEDES 1 pair of legs per segment MILLIPEDES flat bodies
carnivorous with poison claws
MILLIPEDES
2 pairs of legs per segment
rounded bodies
most herbivores
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