Phoretic deutonymphs of Winterschmidtia tawantinsuyuca sp. n. (Acari: Winterschmidtiidae) are described from Peru. This is the fourth species of the genus recorded in the Neotropical realm. Similar to the three other Peruvian species, the new species is phoretic on bark beetles, but this is the first finding of Winterschmidtia on the beetles of the genus Xyleborus (Coleoptera: Curculionidae: Scolytinae). The new species differs from all others in the ornamentation on of its prodorsal shield.
We describe unusual heteromorphic deutonymph of Mycetinopus striatipedis gen. and sp. n. (Acari: Acaridae) phoretic on the handsome fungus beetle Mycetina marginalis (Coleoptera, Endomychidae) in the Eastern Palearctic. These deutonymphs have a unique combination of character states that make them very distinct in the family Acaridae: an unpaired pigmented spot
on the anterior propodosoma is present; supracoxal setae scx filiform and bifurcate; genu I with two solenidia; tibia-tarsi I–II are distinctly elongated and striated; vertical setae ve are present, and tarsal setae aa are lacking. Our work emphasizes the importance of continued exploration and documentation of the biodiversity of astigmatid mites associated with invertebrate hosts.