1. Sub - Phylum Chelicerata
Class: Arachnida
Arthropods without mandibles and antennae.
Have 6 pairs of appendages:
Including:
4 Pairs of walking legs
One pair of fanglike mouth parts (chelicerae)
One pair of pedipalps
2 Body sections:
Cephalothorax
Abdomen

2. Chelicerates 2

3. 1
Cephalothorax 2
Abdomen 6 4 3 9 5 8
Fanglike chelicera
555 5 7

4. Functions:
Chelicerae – contain fangs used to stab and paralyze prey with venom.
Pedipalps – grab prey
Spinnerets – Organs that contain silk glands, force silk through these.
Book lungs – Used for respiration (O2 enters through the spiracle.

5. Functions continue:
Malpighian tubules – For excretion of metabolic
wastes.
Chelicerate groups:
Horsehoe crabs
Sea spiders
Arachnids – include spiders, scorpions, mites,
ticks and chiggers.
Adaptations shared by arachnids:
Waterproof cuticle
Book lungs
Malpighian tubules
Spiracles

6. Types of arachnids:
Spiders
Mites
Ticks
Chiggers
Scorpions