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The Common House Spider, also known by its scientific name Parasteatoda tepidariorum, is a small, harmless spider that is frequently found in human dwellings. It belongs to the Arachnida class, which includes all spiders, scorpions, mites, and ticks. This particular species of spider is part of the Theridiidae family, also known as tangle-web or cobweb spiders. The Common House Spider has a round, bulbous abdomen, and its body is typically brown or gray in color with distinctive white markings. They are relatively small, with a leg span of about 1 to 1.5 inches. These spiders are known for building messy, irregular webs in corners of rooms, under furniture, and in window frames. While the Common House Spider is not dangerous to humans, it can be a nuisance when it builds its web in inconvenient locations. Despite their somewhat unsightly appearance, these spiders play an important role in controlling the population of other insects in and around homes. They are beneficial to have around as they help keep pest populations under control. Overall, the Common House Spider is a fascinating and useful creature that can be found in many households around the world. While it may not be the most attractive or beloved of spiders, it is an important part of the ecosystem and plays a vital role in keeping insect populations in check.