and Acariformes (sometimes known as Actinotrichida) are mites, as well as some of the Parasitiformes (sometimes known as Anactinotrichida). Recent genetic research has suggested that Acari is polyphyletic (of multiple origins).

Current understanding of probable chelicerate relationships, after Sharma and Gavish-Regev (2025):

However, a few phylogenomic studies have found strong support for monophyly of Acari and a sister

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