Mesostigmata
Mesostigmata is an order of mites, characterized by their unique mouthparts and leg morphology. These arachnids are found in various environments, including soil, leaf litter, and animal nests. They are small, ranging from 0.2 to 1.5 millimeters in length, and have a compact body structure with four pairs of legs. Mesostigmata species possess a specialized mouthpart called the gnathosoma, which is used for feeding on various food sources such as other arthropods, fungi, and nematodes. Their leg structure includes the presence of both solenidia and hysterosomal setae, which are unique to this order. Mesostigmata play a crucial role in regulating populations of other organisms and contribute significantly to ecosystem balance.