A new species of the family Rotundabaloghiidae (Parasitiformes: Uropodina) is described, based on mite material collected from Peru. Rotundabaloghia dillerae sp. nov. is morphologically similar to R. belemensis, and differs by the following features: the total body length 261–284 µm (vs. 400 µm in R. belemensis), opisthosoma in the region of setal bases V6–7 and Ad1 densely covered with alveolar pits (vs. smooth); setae V6–8 and Ad1 about twice as long as V2 (vs. V2, V6–8, Ad1 subequal in length).http://www.zoobank.org/urn:lsid:zoobank.org:act:EB94BEF9-1229-44A2-8973-74BCDC46C7B3http://www.zoobank.org/urn:lsid:zoobank.org:pub:39C4EFBC-6D7E-4388-BA70-1EF7C6C6B909