AliGROOVE results of concatenated and single gene analyses on mitochondrial data of Chelicerata taxon groups. Except of Cytochrome Oxidase I (mainly positive pairwise similarity scores) and ATP6 (mainly negative pairwise similarity scores), AliGROOVE identified mainly negative similarity scores in pairwise comparisons whenever sequences of Acariformes (A) are involved. Although subgroups within Acariformes get a higher bootstrap support in the best ML tree using the supermatrix data (shown here), they are tagged with AliGROOVE as unreliable. The misleading information accumulates for these taxa especially in the COII and COIII sequences, while ATP6 is generally to noisy. In the concatenated data set (“supermatrix”) the misleading patterns are still dominant.