Molting Spider

Taxonomy
Spiders are divided into two sub-orders, Mesothelae and Opisthothelae, of which the latter contains two infra-orders, Mygalomorphae and Araneomorphae. Over 40,000 living species of spiders (order Araneae) have been identified and are currently grouped into about 110 families and about 3,700 genera by arachnologists.
Sub-order - Species - Genera - Families - Segmented plates on top of abdomen - Ganglia in abdomen - Spinnerets - Striking direction of fangs