Creatures with jointed appendages The Arthropods Creatures with jointed appendages
Classification Chelicerates Mandibulates Horseshoe crabs Spiders Ticks and mites Sea spiders Mandibulates Crustaceans Insects Centipedes and millipedes
Characteristics Jointed appendages Chitinous integument Segmented Tagmata Moulting Open circulatory system Unique modes of excretion
Characteristics continued Developments in the nervous system Sensory structures--antennae and eyes Simple-ocellus compound Complex patterns of reproduction
Jointed Appendages Biramous appendages Example of the trilobites