Animals IV: Terrestrial Arthropods

Characteristics:
Bilateral symmetry with cephalization

Chitonous exoskeleton

Segmentation:
 * Somite: individual segment
 * Tagma: multiple somites; plural: tagmata
 * each somite usually has a pair of jointed appendages

Classes
Arachnida: spiders, scorpions, ticks, mites

Myriapoda: centipedes, millipedes

Insecta: insects

Orders  Class Insecta

 * Coleoptera: beetles
 * Dermaptera: earwigs
 * Diptera: flies, mosquitoes
 * Hemiptera: true bugs
 * Hymenoptera: ants, wasps
 * Lepidoptera: butterflies, moths
 * Odonata: dragonflies
 * Orthoptera: grasshoppers