Sarcoptic mites (Acari, Sarcoptidae) parasitizing the brown rat Rattus norvegicus (Berkenhout, 1769) (Rodentia, Muridae), with a new data for the fauna of Poland.

One of the least researched groups of parasitic arthropods in the brown rat Rattus norvegicus (Berkenhout, 1769) are skin mites from the family of Sarcoptidae. Specimens representing two species of sarcoptic mites were found in 30 examined rats from northern Poland: Notoedres muris Megnin, 1877 and Trixacarus diversus Sellnick, 1944. The total prevalence and mean intensity of infestation were 13.3% and 3.3, respectively. At the same time, the list of sarcoptic mites occurring in Poland was completed with a new genus and new species--T. diversus.