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used in different senses. In one system, the whip-scorpions are treated as the order Uropygi and the short-tailed whip-scorpions as order Schizomida, within the class Arachnida. This approach is followed by various taxonomic databases as of September 2025. Molecular phylogenetic studies show that the two orders are sister taxa. Thelyphonida is then the clade containing the two, with the related order Amblypygi (whip-spiders) falling outside Thelyphonida, but grouped

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