1. Creatures with jointed appendages
The Arthropods
Creatures with jointed appendages

2. Classification Chelicerates Mandibulates Horseshoe crabs Spiders
Ticks and mites
Sea spiders
Mandibulates
Crustaceans
Insects
Centipedes and millipedes

3. Characteristics Jointed appendages Chitinous integument Segmented
Tagmata
Moulting
Open circulatory system
Unique modes of excretion

4. Characteristics continued
Developments in the nervous system
Sensory structures--antennae and eyes
Simple-ocellus
compound
Complex patterns of reproduction

5. Jointed Appendages
Biramous appendages
Example of the trilobites