Trombidiid is a type of mite that is commonly found in soil and vegetation. It is also known as a red velvet mite or harvest mite. There are several other synonyms that are used to refer to this type of mite, including trombidiid mite, trombidium, and Erythraeidae. These mites are typically bright red in color, have eight legs, and are often seen in large numbers during the spring and summer months. Some species of trombidiid mites are parasitic and can cause skin irritations in humans and other animals. Despite their potential nuisance, trombidiids play an important role in the ecosystem by serving as prey for other animals and contributing to soil health.