The first report of Xenillus salamoni Mahunka 1996 (Acari: Oribatida) in Poland, with the key to European Xenillus
  The genera Liacarus, Stenoxenillus and Xenillus (Oribatida: Gustavioidea) from Turkey
  Spermatophores and spermatozoa of Oribatid mites (Acari, Oribatida). Part I. Fine structure and histochemistry