Micrathena gracilis is a spider in the family Araneidae, commonly known as the Spined Micrathena. It is completely harmless to humans.

This spider spins a moderately large, very tightly coiled web, often in wooded or brushy areas.  Only females build webs. They exhibit a bulbous abdomen with a total of ten spines. Males are about half the size of females, and exhibit a fair amount of sexual amorphism.