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Pseudoscorpions are small arachnids belonging to the order Pseudoscorpionida, typically measuring between 0.5 and 8 millimeters in length. Despite their name, they are not true scorpions but share some similarities with them, such as a pincer-like pedipalps used for capturing prey and defending themselves. These arachnids have a compact body shape, with a large cephalothorax (fused head and thorax) and a small abdomen. They possess eight legs, like all other arachnids, but lack the long, whip-like tail of true scorpions. Pseudoscorpions are found worldwide in various habitats, including leaf litter, soil, and caves. Pseudoscorpions are unique among arachnids because they possess book lungs, a type of respiratory organ that allows them to breathe atmospheric oxygen directly into their bodies. This feature sets them apart from other arachnids, such as spiders and mites, which typically have tracheal systems for respiration. In the hierarchical classification of animals, pseudoscorpions fall under the phylum Arthropoda, class Arachnida, and order Pseudoscorpionida. As part of Kingdom Animalia, they share common characteristics with all other animals, including being multicellular organisms, having specialized tissues for various functions, and reproducing sexually with internal fertilization. Pseudoscorpions play an essential role in the ecosystem by controlling small arthropod populations and contributing to nutrient cycling through their decomposition activities. Their presence in diverse habitats highlights the rich biodiversity found within the Kingdom Animalia, particularly among arachnids.