Reference

H. Long, Weibo Song, Khaled A. S. AL-Rasheid, J. Gong (2009): Three marine haptorid ciliates from northern China: Paraspathidium apofuscum n. sp., Trachelotractus entzi (Kahl, 1927) Foissner, 1997 and Apotrachelotractus variabialis Long, Song and Warren, 2009 (Protozoa, Ciliophora) – J. Nat. Hist. – 43: 29 - 32.