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This is good, uncomplicated information from Wikipedia. Here is the link
“Micrathena gracilis is a spider in the family Araneidae (orb-weavers), commonly known as the Spined Micrathena. This spider spins a moderately large (can be 30 cm (11.81 in) or more across), very tightly coiled web, often in wooded or brushy areas. It is completely harmless to humans.
The only web-building members of the species are the females. Females are 8-10 mm long. They exhibit a bulbous abdomen with a total of ten spines. Males exhibit a fair amount of sexual dimorphism. They tend to be around only half the size of the females. Also, they have fewer spines, a flatter abdomen, and a slightly lighter tone. Although males can produce silk, they mostly use it in the mating ritual, which frequently also proves fatal.
Micrathena gracilis hatches in the spring, the image of an adult. After the summer’s growth, the female lays eggs in a sack. These remain relatively dormant through the winter months. The general life span is one year in length.”
We call them “bag spiders” because their abdomens look like sacks – LOL. It is generally their webs that cause us to get “web-faced” as we walk through the woods.
This picture was taken in Green Lane, Pennsylvania, USA, on September 2, 2012.