The term 'minute arachnid' refers to two different species of mites. The first is the MITE, which is a small arachnid that typically measures less than 1 millimeter in length. The second is the Housemite, which is a larger species of MITE that can measure up to 10 millimeters in length. Both species are found in a variety of habitats and feed on organic matter such as dead skin cells, fungi, and pollen. They are also known to cause allergic reactions in humans.