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Vertagopus arboreus is a widespread and common bluish violet species that reaches a length of 1.8 mm. Almost all the records are from the trunks of trees, under dead bark and lichens, and in bird nests. Tibiotarsi 1, 2 and 3 possess 2:3:3 clavate tenant setae respectively (see Fig. 1) and the mucro has four teeth (Fig. 2). The furca of Vertagopus arboreus is relatively longer than that of the greyish-brown Vertagopus cinereus. In addition, Vertagopus arboreus does NOT possess setae on the ventral side of the thorax (th2, th3) or on the second abdominal segment (abd2) whereas Vertagopus cinereus has 3-10 + 3-10 ventral setae on each of th2 and th3, and a group of 5-12 ventral setae on abd2.
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