Micrathena gracilis is a spider in the family Araneidae (orb-weavers), commonly known as the Spined Micrathena or the "CD Spider" because its webs can make it appear that there are CDs hanging from the trees. It is completely harmless to humans.
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From top to bottom: Tyrannosaurus rex, representing Tyrannosaurids, Allosaurus fragilis on the behalf of Allosaurids and Ceratosaurus nasicornis for the (currently) rather narrow Ceratosaurid family.