| abstract | A new species, Demodex plecoti sp. nov. (Acariformes: Demodecidae), is described based on adult and immature stages from the brown long-eared bat Plecotus auritus (Linnaeus, 1758) in Poland. The mites were found in 100% of the examined bat individuals, with a mean intensity of 23.5 parasites per host. Demodex plecoti sp. nov. was observed only in the hairless body regions, were the skin was membranous, thin and delicate. |